Black Box MT400A, MT410C, MT412C, MT415C-530, MT415C-232, MT415C-35, MT418C, MT419C, MT420C-232, MT420C-35, MT420C-530, MT430C, MT435C, MT436C, MT437C, MT438C, MT439C, MT440C, MT441C, MT442C, MT443C, MT445C, MT446C, MT447C, MT448C, MT450C User Manual
Reklama
Reklama
MT400A
MT410C
MT412C
MT420C-232 MT439C
MT420C-35 MT440C
MT420C-530 MT441C
MT415C-530 MT430C
MT415C-232 MT435C
MT415C-35
MT418C
MT419C
MT436C
MT437C
MT438C
MT442C
MT443C
MT445C
MT446C
MT447C
MT448C
MT450C
MT451C
MT452C
MT453C
MT455A
MT456A
MT460C
MT462C
MT465C
MT470C
AUGUST 1994
MT480C
MT481C
MT482C
MT471C MT483C
MT472C EHN080-0015-MM
MT473C EHN080-0015-MF
MT475C EHN081-0015-MM
MT476C EHN081-0015-MF
T1 Channel Bank
T1 CHANNEL
BANK
CUSTOMER
SUPPORT
INFORMATION
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
T1 CHANNEL BANK
FEDERAL COMMUNICATIONS COMMISSION
RADIO FREQUENCY INTERFERENCE STATEMENT
Class B Digital Device. This equipment has been tested and found to comply with the limits for a Class B computing device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or telephone reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult an experienced radio/TV technician for help.
CAUTION
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
To meet FCC requirements, shielded cables and power cords are required to connect this device to a personal computer or other Class B certified device.
This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio Interference Regulation of the Canadian Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des
Communications du Canada.
TRADEMARKS
UL ® is a registered trademark of Underwriters Laboratories Incorporated.
AT&T ® and Accunet ® are registered trademarks of AT&T.
MCI ® is a registered trademark of MCI Telecommunications Corporation.
Plexiglas ® is a registered trademark of Rohn and Haas Company.
MNP ® is a registered trademark of Microcom Systems, Inc.
VT52 ™ and VT100 ™ are trademarks of Compaq Computer Corporation.
Sprint ® is a registered trademark of U.S. Sprint Communications Co. Ltd.
Any other trademarks mentioned in this manual are acknowledged to be th property of the trademark owners.
1
2
T1 CHANNEL BANK
Contents
Chapter Page
1. Specifications .................................................................................................................................5
2. Introduction ..................................................................................................................................6
2.1 Features and Benefits .........................................................................................................6
2.2 Using this Manual...............................................................................................................7
2.3 About T1 and Pulse Code Modulation (PCM).................................................................7
2.4 How PCM Transmits Voice Samples ..................................................................................7
2.5 Multiplexing Is:...................................................................................................................7
2.6 Digital Signal Hierarchies ..................................................................................................8
2.7 T1 Message Characteristics ................................................................................................9
2.8 Summary: What Travels over a T1 Circuit? ......................................................................12
2.9 Summary: T1 Advantages..................................................................................................12
3. System Overview ............................................................................................................................13
3.1 Features and Benefits .........................................................................................................13
3.2 System Components ...........................................................................................................14
3.3 Component Descriptions ...................................................................................................15
3.4 Network Applications .........................................................................................................17
4. Pre-Installation Considerations ....................................................................................................25
4.1 Unpacking...........................................................................................................................25
4.2 Installation Procedure........................................................................................................28
4.3 Operating Environment.....................................................................................................28
4.4 Cabling Requirements .......................................................................................................31
4.5 Wiring Pin Diagrams ..........................................................................................................32
4.6 List of Cables.......................................................................................................................54
4.7 List of Parts with Part Numbers .........................................................................................55
4.8 Installation Time ................................................................................................................57
4.9 Installation Equipment ......................................................................................................57
4.10 Optional Installation Equipment .....................................................................................57
5. Shelf Description and Installation................................................................................................58
5.1 Standard Single Shelf .........................................................................................................58
5.2 Shelf Accessories.................................................................................................................60
5.3 Shelf Block Diagram...........................................................................................................70
6. Hardware Configuration Setup ....................................................................................................72
6.1 AC Power Supply ................................................................................................................72
6.2 AC Rear-Plug Power-Entry Module ...................................................................................74
6.3 DC Rear-Plug Power-Entry Module ...................................................................................76
6.4 T1 Logic Card .....................................................................................................................77
6.5 Switches on the T1 Logic Card..........................................................................................80
6.6 DSX-1 Rear Plug Assembly.................................................................................................80
6.7 CSU .....................................................................................................................................82
6.8 Quad PCM Voice Front Plug Assembly .............................................................................83
6.9 Quad 4-Wire E&M Rear Plug Assembly ............................................................................85
6.10 Quad 2-Wire FXS Rear Plug Assembly .............................................................................94
6.11 Quad 2-Wire FXO Rear Plug Assembly ............................................................................96
T1 CHANNEL BANK
Chapter Page
6.12 Quad 4-Wire Analog Data (AD) Assembly ......................................................................98
6.13 High-Speed Data Card (Single).......................................................................................100
6.14 Dual Data Card .................................................................................................................102
6.15 Dual Data Card (DSU-DP) Rear Interface......................................................................109
6.16 Subrate Dual Data Card ...................................................................................................110
6.17 High-Speed Data Card Rear Plug Assemblies.................................................................111
6.18 Office Channel Unit Data Port........................................................................................115
6.19 MCC Unit..........................................................................................................................119
6.20 Dual Modem Card............................................................................................................125
7 Plug-In Card Installation...............................................................................................................133
7.1 Power Supply Assemblies ...................................................................................................133
7.2 Network Management Assemblies.....................................................................................134
7.3 T1 Logic Assemblies ...........................................................................................................134
7.4 Voice Assemblies.................................................................................................................135
7.5 Data Assemblies ..................................................................................................................135
8. Configuring the Network..............................................................................................................137
8.1 Overview of MCC Control Screens....................................................................................137
8.2 Power Up and Opening Menu ..........................................................................................140
8.3 Main Menu..........................................................................................................................141
8.3.1 1 — Systems Function Menu...................................................................................142
8.3.2 2 — Loopback Menu...............................................................................................147
8.3.3 3 — Digital Milliwatt Menu .....................................................................................149
8.3.4 4 — Monitor Test Plug-ins Menu............................................................................151
8.3.5 5 — Configure Plug-ins Menu ................................................................................152
8.3.6 6 — Force Configuration Change ..........................................................................153
8.3.7 7 — Clone Configuration A (B,X, Y) .....................................................................154
8.3.8 8 — Set Configured Channel Bank Mode .............................................................155
9. Security Levels ...............................................................................................................................156
9.1 Level 4 Security...................................................................................................................156
9.2 Level 3 Security...................................................................................................................158
9.3 Level 2 Security...................................................................................................................160
9.4 Level 1 Security...................................................................................................................161
10. Configuring and Monitoring Plug-ins........................................................................................162
10.1 Configuring the T1 Network ...........................................................................................162
10.2 Configuring Shelf Plug-in Assignment Menu.................................................................163
10.3 T1 Configuration Menu ...................................................................................................166
10.4 Quad PCM Voice Card Configuration Menu .................................................................169
10.5 High-Speed Data Channel Configuration Menu............................................................170
10.6 Subrate DDC Configuration Menu .................................................................................171
10.7 DDC Configuration Menu ...............................................................................................172
10.8 Dual Modem Configuration Menu .................................................................................173
10.9 MCC Configuration Menu...............................................................................................175
10.10 Four Basic Configurations .............................................................................................176
10.11 Monitoring the T1 Network............................................................................................177
10.12 T1 Card Monitor/Test Menu..........................................................................................178
10.13 T1 Card LEDs ..................................................................................................................181
10.14 Quad PCM Voice Card Monitor/Test Menu .................................................................181
10.15 High Speed Data Channel Monitor/Test Menu ...........................................................182
3
T1 CHANNEL BANK
Chapter Page
10.16 Subrate DDC Monitor/Test Menu .................................................................................183
10.17 Dual Data Card Monitor/Test Menu .............................................................................185
10.18 Dual Modem Monitor/Test Menu .................................................................................186
10.19 Alarm Summary..............................................................................................................187
10.20 MCC Monitor/Test Menu...............................................................................................189
11.0 Setting Up System Network Timing Plan ...............................................................................191
11.1 Signal Flow ........................................................................................................................191
11.2 System Timing Plan ..........................................................................................................192
11.3 Choice of Clocks...............................................................................................................193
11.4 Split Shelf Timing Plan ....................................................................................................193
11.5 Compensating for Jitters and Clock Phase .....................................................................194
11.6 Timing Notes for Specific T1 Applications.....................................................................195
12.0 Testing and Troubleshooting...................................................................................................200
12.1 Verifying Correct Operation............................................................................................200
12.2 Changing a Configuration ...............................................................................................200
12.3 Configuration Conflicts ...................................................................................................200
12.4 Troubleshooting Alarms...................................................................................................200
12.5 Testing for Tone Levels ....................................................................................................202
12.6 Testing the E&M Cards ....................................................................................................202
13.0 Post Installation ........................................................................................................................204
Appendix A: Glossary .......................................................................................................................205
Appendix B: Site Survey...................................................................................................................215
4
1. Specifications
CHAPTER 1: Specifications
Aggregate Bit Rate — 1.544 Mbps
Line Code — AMI, B7, B8ZS
T1 Interface — Electrical DSX1, Mechanical
DB15 female
Standard Frame Format — D4 (SF), Extended
Super Frame (ESF)
Multiplexing Technique — TDM per AT&T PUB
62411
MCC System — Works with standard VT100 or
VT52 terminal; configuration data is stored in non-volatile memory on both the MCC plug-in and individual plug-in units; restoration is provided for MCC failure and individual plug-in failure
Network Configurations — End mux, dumb channel bank, soft-configured channel bank, smart channel bank
Channel, Voice — 4 channels per card, E&M Type
I, II, III signaling, 2-wire loop or ground start,
FXS, DXO, automatic ringdown
Channel, High-Speed Data — N x 56 or N x 64 with N=1 to 24, supporting rates from 56 K to
1.536 Mbps, internal clock,
Interface electrical/connector: V.35/34-position
M-block female (DCE), EIA-530/DB25 female
(DCE), RS-232/DB25 female (DCE)
Redundancy Options — Power only, Redundant
T1s, T1 redundancy and power
Ancillary Equipment — Expansion chassis
(additional 14 slots), utility shelf for housing:
Redundant power, ring generator, -48V power supply for telephone signaling
Environmental — 32 to 122°F (0 to 50°C) temperature, 10 to 90% relative humidity
(non-condensing)
Power — 115-VAC, 60 Hz, 65 watts max., 170 watts total power consumed, -48V DC
Dimensions — 7"H (17.8 cm) (4 RS) without UL ® baffle or 8.75"H (22.2 cm) (5 RS) with UL ® baffle, 19"W (48.3 cm) x 20"D (50.8 cm)
Weight — 14 lb. (6.4 kg) with baffle and ears
(no cards)
5
6
T1 CHANNEL BANK
The T1 channel bank is a menu-driven, programmable time-division multiplexer (TDM) that combines 24 channels of voice or data service into a standard 1.544 Mbps trunk. The multiplexing format complies with AT&T ® PUB 62411 and is compatible with digital access cross-connect systems
(DACS). This includes AT&T Accunet ® T1.5 and
T1.5 Reserve with both D4 (superframe) and ESF
(extended superframe) framing. The T1 Channel
Bank is also compatible with microwave, satellite, fiberoptic T1 line facilities, and fractional T1 configurations.
The T1 Channel Bank uses a Single T1 powersupply and MCC (monitor, control, and configure) card.
The architecture of the T1 Channel Bank is a midplane design that accommodates plug-in card sets that come in pairs. One plug-in card inserted into the front end of the chassis contains the circuit function associated with multiplexing. A second plug-in card inserted into the rear matching slot contains the electrical and mechanical interface functions. For example, the quad voice card can use different types of rear cards for interfacing different telephone signaling systems. This makes it easier and less costly to adapt to different applications.
Monitoring, control, and configuration of the T1
Channel Bank is via a VT100™ or VT52™ terminal.
This reduces the need to set switches manually on the plug-in cards. Because the T1 Channel Bank provides a number of options to give you greater control over your communications network, you can connect several sites together and control them from one central location. Password protection is provided to allow only authorized entry into the configuration screens.
2.1 Features and Benefits
• Menu-driven network management—
Configuration, monitor, and control are administered with a built-in menu-driven management system. Management using a PC or dumb terminal reduces installation, training, and troubleshooting time.
2. Introduction
• Reduced Leased-Line Expenses—In a point-topoint application, many leased lines can be combined into one four (4) wire line.
• Modular Design—Allows expansion with minimal cost.Cards can be added as the network grows.
• Toll-quality Voice—Combining high-speed voice and data multiplexing over a single T1 circuit reduces recurring costs. PCM-based voice ensures high quality audio and reliability. FXS,
FXO, and E&M interfaces are supported.
• Data Options—High-speed data cards and dual channel cards are available. V.35, RS-530, and
RS-232 interfaces are fully supported.
• ModemOptions—Dual channel V.32bis modem card options provide direct connection between a voice channel and each modem. This eliminates the need for a separate modembank and saves money. Ideal for modempooling, remote LAN access, and credit card/point-ofsale applications.
• Supports Multiple Services and Equipment—
Data services include: analog modems, dedicated DDS, switched 56, fractional T1 and
T1. Voice services include: 800,WATS, and tie lines. Connection of voice PBXs (DSX-1, FXO, or E&M),LAN bridges and routers (V.35,RS-
232,or RS-530),CSU/DSUs, and mini/mainframe computers are possible.
• Drop and Insert Capabilities—Allows connection of DSX-1 based devices. For example, PBXs with unused DSOs can connect through the Channel Bank while data is inserted.
• Dual T1 Lines—Two T1 lines can be connected to the channel bank allowing cost savings for larger systems or a backup T1 line for redundancy. If the primary line fails,the secondary line can keep thenetwork operational.
• Built-In CSU—Eliminates the need for an external CSU, saving equipment costs.
2.2 Using This Manual
This manual describes how to install, configure, and use a T1 Channel Bank. Some familiarity with telecommunications is required to understand this manual. It is organized to guide you through the installation and operating process, beginning with the section on “Pre-Installation Considerations.” A glossary is included.
In this manual, keys to press on the keyboard for commands to the MCC are shown in bold type.
Example: “Access Configure Plug-ins” by pressing 5 and Enter. Type the letter of the desired configuration: A and Enter.
2.3 About T1 and Pulse Code Modulation (PCM)
T1 is a digital transmission method for combining
(“multiplexing”) multiple voice and/or data channels over two pairs of wires. The channel bank was originally developed by AT&T in the 1960’s to expand network capacity and yet still use existing cables and manhole or pole facilities. Through advanced technology, it is possible to send 24 simultaneous telephone conversations over one line.
There are two ways that information of any type can be transmitted: either in analog or in digital form. The analog form transmits signals in a continuous range of frequencies. Most telephone sets today are analog sets that can transmit a given range of frequencies. Analog forms can be encoded into discrete levels and then encoded into a binary word called PCM (Pulse Code Modulation). This digital form can then be multiplexed with other voice channels and transmitted across T1 lines.
2.4 How PCM Transmits Voice Samples
Voice signals are continuous variations of electrical current, which duplicate the changes in acoustical air pressure that we hear as sound. Imagine that a voice analog signal looks like a sine wave.
CHAPTER 2: Introduction
In PCM, you take a “snapshot” of the sine waves many times each second and give each discrete
“picture” a number. Each sample is coded as a digital number representing the electrical voltage value at the sample time. Then you send the numbers of the samples in digital form to the other end. This process is similar to a motion picture in which we perceive continuous motion through a repetitive display of projected snapshots. The ear, like the eye, does not distinguish the discrete samples as long as the repetitive rate is fast enough. PCM samples the voice 8,000 times a second. It measures each sample in 8 bits, encoding one second of voice conversation into 64,000 bits, i.e.: 8 x 8,000.
When a continuous voice signal is converted to a sequence of PCM-coded numbers, the digital signal can then be multiplexed and put into multiple voice channels. The receiving demultiplexor can easily distinguish which PCM sample goes with which voice circuit (conversation). This technique
(called Time-Division Multiplexing or TDM) also makes it easy to mix computer data with the voice samples. The equipment needed to combine voice and digital signals is called a multiplexor.
2.5 Multiplexing Is:
• Sharing a data link (line or trunk) among several different pieces of equipment to ensure that the capacity of the link is used efficiently.
• Using a single communications link to transmit a number of different signals, either simultaneously or in rapid succession
There are several methods of transmitting more than one signal over one path: frequency-division multiplexing (FDM), statistical time-division multiplexing (STDM), and time-division multiplexing (TDM). As shown in Fig. 2-1, a telecommunication link may be visualized as a medium with some bandwidth, available over a length of time. FDM separates the channels by frequencies, TDM separates the channels by time, and STDM only uses the bandwidth when the channels are active.
T1 CHANNEL BANK
Time
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Time
FDM
Time
TDM
Time
STDM
Fig. 2-1. Different Types of Multiplexors.
2.6 Digital Signal Hierarchies
Digital multiplexers are intended to carry as many voice channels as possible over existing interexchange cable pairs. Unfortunately, the higher the number of channels that are combined, the shorter the distance the TDM signal can travel without a repeater to boost the signal. In order to facilitate repeater installation under streets, a 24-channel system was adopted in the United States, Canada, and Japan to insure transmission distances equal to every other manhole interval. In comparison,
Europe and other parts of the world have adopted a 32-channel system, since they tend to have shorter manhole spacing.
The T1 system described above is the first level in a multilevel TDM hierarchy, which operates at a North American standard speed of 1.544 Mbps
(24 channels x 64 Kbps per channel plus 8 Kbps
“overhead”), designated as Digital Signal One
(DS1). This contrasts with Digital Signal Zero (DS0) which specifies the lowest level of a T1 facility.
See Table 2-1 for the digital multilevel hierarchy.
The physical transmission lines for the higher rates are designated as T2, T3, and T4.
8
CHAPTER 2: Introduction
Level
DS0
DS1
DS2
DS3
DS4
T=Transmission rate
DS=Multiplexing system
Channel
Voice/data Services
(24) DS0s
(4) T1s
(7) T2s or 28-T1s
(6) T3s
Table 2-1. Digital Multilevel Hierarchy
Equal DS0
1
24
96
672
4032
Composite Rate
64 Kbps
1.544 Mbps
6.312 Mbps
44.736 Mbps
274.176 Mbps
Trans. Rate
Voice/data circuits
T1
T2
T3
T4
2.7 T1 Message Characteristics
The DS1 naming convention uses 24 eight-bit words
(one word for each of the 24 DS0 channels) and one framing bit for a total of 193 bits per frame.
The T1 aggregate channel transmits 8000 frames per second so each frame lasts 125 microseconds on the T1 line. Each frame has slot numbers from 1-24.
See Fig. 2-2 for a representation of how time slots comprise frames. Each time slot has space for 8 bits.
The 193rd bits on successive frames follow a pattern (100011011100) for the superframe format.
In the T1 Channel Bank, this pattern is checked to ensure synchronization has been maintained. If the receiving T1 Channel Bank can not find the pattern on the 193rd bit, synchronization is lost.
Synchronization is crucial for digital transmission.
The receiving machine must know which bit goes to which channel.
Data can be inserted in seven (7) bits out of the available 8 of a DS0 for a root rate of 56 Kbps, or all 8 bits can be used for a root rate of 64 Kbps. See
Fig. 2-3 for how bits fit into the frames. The T1 line coding must be B8ZS (bipolar eight zero substitution) to transmit 64 Kbps of data.
9
T1 CHANNEL BANK
One frame
193 bits
(125
µ sec)
Channel 1 Channel # Channel 23 Channel 24
10
F
1 2 3 4 5 6 7 8
Speech
Bit #
Supervisory and signaling bit
Framing code. The 193rd bits on successive frames follow a pattern.
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
Speech Speech
Fig. 2-2. T1 Frame and Time Slots.
1
Ff
Fs
Frame #
1
0
1 Super frame - 12 Frames
1.5 msec, 2316 Bits
0 1 0 1 0
0 1 1 1 0
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12
CHAPTER 2: Introduction
2
One frame
193 bits
(125
µ sec)
Time slot #
24
F
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
7
8
9
10
11
12
Frame
#
1
2
3
4
5
6
F
0
1
1
1
0
0
0
0
1
0
1
1 d1 d2
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V d3 d4 d5 d6
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V
V V d7 d8
V V
V V
V V
V V
V V
V A
V V
V V
V V
V V
V V
V B
Signaling frame
Signaling frame
Bit #
8 -Bit voice
7 -Bit voice
8 -Bit voice
7 -Bit voice
V = Bit used for voice/data
A & B = Signaling bits d = Data (information bits)
Fig. 2-3. D4 Frame (Superframe Format).
1 2 3 4 5 6 7 8
11
T1 CHANNEL BANK
2.8 Summary: What Travels over a T1 Circuit?
Voice:
• 800 inbound services from long-distance carrier
• Outbound WATS to long distance carrier
• TIE lines between PBX systems (local or long distance)
• Off-premise extensions (OPX)
• Foreign exchange (FX) circuits
Data:
• Subrate data using external TDM or STAT muxes
• Analog data using existing leased or dialup modems
• 56/64 Kbps data channels for higher bandwidth requirements
• N x 56/64 Kbps for LAN gateway or host-to-host connections (i.e., 256 Kbps, 768 Kbps, etc.)
Video:
• Slow-scan video at 56 Kbps
• N x 56/64 Kbps (i.e., 384, 768 Kbps, etc.)
2.9 Summary: T1 Advantages
• Reduces costs for combining services for those that have more than 8 to 12 dialup or leased telephone lines between two locations and want to combine services over a single circuit
• Combines more than 2 or 3 data lines at 56 Kbps between locations. Facilitates data exchange between locations at speeds greater than 56
Kbps (for high-speed data circuits: LAN,
CAD/CAM, file transfer or digitized video)
• Allows more control over your voice or data network
• Aids applications that require redundant paths
• Better quality over poor lines (all digital)
• Uses data compression
• Completely digital end to end
12
CHAPTER 3: System Overview
3. System Overview
3.1 Features and Benefits
Toll-Quality Voice
Combining high-speed voice and data multiplexing over a single T1 circuit reduces recurring costs. The
T1 Channel Bank supports toll-quality voice through PCM (24 voice channels per T1 span).
Voice (800, WATS, TIE lines) and data (analog modem, 56 Kbps, LAN Gateways) are transmitted easily at cost-effective prices.
Standards-Based Architecture
Standard interfaces communicate with T1 services such as the ACCUNET T1.5 and DACS services. All units support fractional T1 services (FT1) offered by the common carriers. The system supports industry-standard D4 formatted PCM equipment and the extended superframe (ESF). It supports voice and data inputs.
Modular Design
Modular design allows expansion capabilities at minimal costs. Future upgrades are as simple as adding new cards, which can be hot-swapped.
Reduced Leased-Line Expenses
In a point-to-point application, many leased lines can be combined into one 4-wire circuit. For long distance applications, up to 24 channels can be combined into one 4-wire circuit terminating at the carrier’s POP (point of presence).
Supports Analog Interfaces
Support of multiple analog interfaces: 4-wire E&M,
4-wire for data modems, 2-wire FXS, and
2-wire FXO.
Supports Programmable Data Rates
Support of multiple data bandwidth requirements:
56/64, N x 56, N x 64, where N = 1-24.
Supports DSU/CSU
The OCU-DP card supports two DSU/CSU through two 4-wire interfaces. It supports local and remote loopbacks. The OCU-DP card supports 64, 56
(including switched), and 9.6 Kbps.
Menu-Driven Network Management
Simple but powerful network control is administered through the MCC (Monitor, Control,
Configure) Card. Features include loopback control of individual channels, remote alarm monitoring, loopback of individual channels for circuit testing, system alarms and equipment status in real time, dialup access via modems, assigning channel to time slots independent of chassis slots, setting data rates, switch primary or secondary T1 logic sets, and selection of two stored sets of configuration (A or
B). Configuration data is stored in non-volatile memory.
Levels of Security
• Configuration, Loopbacks, Monitor
• Loopbacks, Monitor
• Monitor
13
T1 CHANNEL BANK
3.2 System Components
The hardware and software components consist of the following items.
• T1 Channel Bank w/CSU (MT400A)
- (1) T1-CB Front AC Card-65 W (MT435C)
- (1) T1-CB T1 Front Card (MT440C)
- (1) T1-CB MCC Front Card (MT442C)
- (1) T1-CB MCC Rear Card (MT443C)
- (1) T1-CB Main Chassis w/AC (MT455A)
- (1) T1-CB Blank Thin Card (MT462C)
- (1) T1-CB CSU Rear Card (MT465C)
• T1-CB HS Data Card-530 (MT415C-530) This is a kit consisting of the following cards:
- (1) T1-CB HS Data Front Cards (MT450C)
- (1) T1-CB HS RS-530 Rear Cards (MT452C)
• T1-CB HS Data Card-232 (MT415C-232) This is a kit consisting of the following cards:
- (1) T1-CB HS Data Front Cards (MT450C)
- (1) T1-CB HS RS-232 Rear Cards (MT453C)
• T1-CB HS Data Card-V.35 (MT415C-35) This is a kit consisting of the following cards:
- (1) T1-CB HS Data Front Cards (MT450C)
- (1) T1-CB HS V.35 Rear Cards (MT451C)
• T1-CB OCU-DP 56/64 (MT419C) This is a kit consisting of the following cards:
- (1) T1-CB Dual Data Front Cards (MT470C)
- (1) T1-CB OCU-DP Rear Cards (MT476C)
• T1-CB Dual Data Card-232 (MT420C-232) This is a kit consisting of the following cards:
- (1) T1-CB Dual Data Front Cards (MT470C)'
- (1) T1-CB Dual 232 Rear Cards (MT473C)
• T1-CB Dual Data Card-V35 (MT420C-35) This is a kit consisiting of the following cards:
- (1) T1-CB Dual Data Front Cards (MT470C)
14
- (1) T1-CB Dual V35 Rear Cards (MT471C)
• T1-CB Dual Data Card-530 (MT420C-530) This is a kit consisting of the following cards:
- (1) T1-CB Dual Data Front Cards (MT470C)
- (1) T1-CB Dual 530 Rear Cards (MT472C)
• T1-CB 4W E&M Card (MT410C). This is a kit consisting of the following cards:
- (1) T1-CB Quad Voice Front Card (MT445C)
- (1) T1-CB Quad E&M Rear Card (MT446C)
• T1-CB FXS Card (MT411C) This is a kit consisting of the following cards:
- (1) T1-CB Quad Voice Front Card (MT445C)
- (1) T1-CB Quad FXS Rear Card (MT447C)
• T1-CB FXO Card (MT412C) This is a kit consisting of the following cards:
- (1) T1-CB Quad Voice Front Card (MT445C)
- (1) T1-CB FXO Rear Card (MT448C)
• T1-CB DMC 14.4 Sync (MT425C) This is a kit consisting of the following cards:
- (1) T1-CB DMC 14.4 Front Card (MT480C)
- (1) T1-CB DMC Sync Rear Card (MT481C)
• T1-CB DMC 14.4 Async Card (MT426C) This is a kit consisting of the following cards:
- T1-CB DMC 14.4 Front Card (MT480C)
- T1-CB DMC Async Rear Card (MT483C)
• T1-CB Bat/Ring Gen (MT430C)
• T1-CB Rear AC Card-65 W (MT436C)
• T1-CB Front AC Card-115 W (MT437C)
• T1-CB Front DC Card-65 W (MT438C)
• T1-CB Front DC Card-115 W (MT439C)
• T1-CB DSX-1 Rear Card (MT441C)
• T1-CB Quad Voice Front Card (MT445C)
• T1-CB Main Chassis w/DC (MT456A)
• T1-CB Analog Rear Card (MT460C)
• T1-CB OCU-DP 9.6 Front Card (MT475C)
• T1-CB OCU-DP Rear Card (MT476C)
• T1-CB DMC 19.2 Front Card (MT482C)
• T1-CB DB26M/DB25M Cable (EHN080-0015-
MM)
• T1-CB DB26M/DB25F Cable (EHN080-0015-
MF)
• T1-CB DB25M/V.35M Cable (EHN081-0015-
MM)
• T1-CB DB26M/V.35F Cable (EHN081-0015-MF)
3.3 Component Descriptions
T1 Channel Bank (MT400A)
• The T1 single chassis configuration houses
14 plug-in card sets and one AC power supply.
This includes T1 common logic and Monitor
Control, and Configuration (MCC) cards
(required). The remaining 12 slots can be used for any combination of voice or data cards. Each voice plug-in card provides four voice channels, so 24 voice channels use only 6 of the 12 available slots. The chassis supports two T1 lines in an East and West drop-and-insert configuration or redundant common T1 logic.
The chassis uses a mid-plane design. This front/rear card design makes it possible to change the interface (for example, from EIA-
530 to V.35) without replacing the more expensive front card. This chassis arrangement pairs the plug-in cards.
• The front plug-in cards contain the circuit functions (voice, data, logic, etc.) and are responsible for data buffering and multiplexing from 1 to 4 channels into an assigned T1 time slot.
• The rear plug-in cards provide the electrical, mechanical, and functional channel interfaces.
• These cards can mate with the front assembly to provide the following:
- 4-wire E&M interface, Type I, II, III
- 2-wire loop or ground start interface for FXS
- 2-wire loop or ground start interface for FXO
- 4-wire interface for analog data modems
CHAPTER 3: System Overview
- V.35 high-speed data
- RS-530 high-speed data
- RS-232 low-speed data
- OCU-DP for DSU/CSU operation
MCC Logic Set
Monitor, Control, Configuration (MT442C)
The MCC front plug assembly is a microcontroller to permit communications with a system operator and the various hardware elements of the system.
The microcontroller operates the VT100 or VT52 menus, stores the shelf configuration, and communicates with shelf plug-in cards.
Three levels of MCC security are standard:
• Level 1 adds configuration control of the T1 aggregate and all logic cards with the ability to do loopbacks and monitoring.
• Level 2 allows loopback control of individual channels and monitoring.
• Level 3 is monitor only.
Quad Voice Logic Set 4 Wire E&M Card (MT410C)
This set consists of a front PCM logic card
(MT445C) and a rear interface card (MT446C).
The rear card provides Type I, II, and III signaling.
It has 4 modular 8- pin connectors. This card provides direct termination of 4 wire E&M voice channels on the T1 Channel Bank. It has an RJ-45 connector.
Quad Voice Logic Set 2 Wire FXS (MT411C)
This set consists of a front PCM logic card
(MT445C) and a rear interface card (MT447C).
The rear card is a 2-wire loop or ground start interface for foreign exchange subscriber use. It has
4 modular 6-pin RJ-11 connectors. A tone card for ringback tone is provided.
Quad Voice Logic Set 2 Wire FXO (MT412C)
This set includes a front PCM logic card (MT445C) and a rear interface card (MT448C). The rear card is a 2-wire loop or ground start interface for foreign exchange office use. It has 4 modular 6-pin RJ-11 connectors.
15
T1 CHANNEL BANK
4 Wire Analog Card Logic Set (MT418C)
This set includes a front PCM logic card (MT445C) and a rear interface card (MT460C). The rear card is used to interface analog data modems for voiceband transmission over a T1 circuit. It provides a transmission level of +13 TLP (transmission level point) on the transmit pair and -3 TLP on the receive pair. It has 4 modular 8-pin RJ-45 connectors.
High Speed Data Logic Set V.35 (MT415C-35)
This set consists of 2 front high-speed data cards
(MT450C) and 2 rear interface cards (MT451C).
The rear card is capable of operating in increments of 56 or 64 Kbps up to 1344 or
1536 Kbps. The V.35 card uses one 34-pin female connection. Use the V.35 card when you want digital access at rates up to 1536 Kbps for
CAD/CAM systems, high-speed facsimile, LAN interfaces, and teleconferencing systems.
High Speed Data Logic Set RS-530 (MT415C-530)
This set includes 2 front high-speed data cards
(MT450C) and 2 rear interface cards (MT452C).
The rear card uses one DB25 female connection. It is a balanced 422 interface capable of operating in increments of 56 or 64 Kbps up to 1536 Kbps.
High Speed Data Logic Set RS-232 (MT415C-232)
This set consists of 2 front high-speed data cards
(MT450C) and 2 rear interface cards (MT453C).
The rear card uses one DB25 female connection.
This card is useful for connecting a small number of point-to-point RS-232 data circuits through the network. It can operate at speeds up to 56 or 64
Kbps.
Subrate Dual Data Card 56/64 (MT419C)
This set consists of a sub-rate two-channel front card
(MT470C) and a two-channel OCU-DP rear card
(MT476C). The rear card uses two RJ-45s for connections to the two DSU/CSU via a 4-wire interface. This card set supports 56 Kbps and
64 Kbps.
Dual Data Card Set V.35 (MT420C-35)
This set consists of a dual-channel front card
(MT470C) and a rear two-channel V.35 card
(MT473C). The rear card uses two DB26 miniature connectors for the interface. Use cable 6930-34 or
6930-35 for a true Amp 34-pin connector. This card set supports speeds of 56 or 64 Kbps only.
Dual Data Set RS-530 (MT420C-530)
This set includes a dual-channel front card
(MT470C) and a rear two-channel RS-530 card
(MT472C). The rear card uses two DB26 miniature connectors for the interface. Use cable 6930-32 or
6930-33 for a DB25 interface. This card set supports speeds of 56 or 64 Kbps only.
Dual Data Set RS-232 (MT420C-232)
This set has a dual-channel front card (MT470C) and a rear two-channel RS-232 card (MT473C). The rear card uses two DB26 miniature connectors for the interface. Use cable 6930-32 or 6930-33 for a
DB25 interface. This card set supports speeds of 56 or 64 Kbps only.
Dual Modem Card Set 19.2 Sync (MT425C)
The front card is the MT480C. The sync rear card,
MT481C, has DB26 connectors.
Dual Modem Card Set 19.2 Async (MT426C)
The front card is the MT480C. The async rear card,
MT483C, has two RJ-45 connectors. It operates from
300 bps to 19.2 Kbps.
16
3.4 Network Applications
You can set up a variety of data communications network configurations with the Network management via a menu-driven system with the operating software residing on the MCC card. For
CHAPTER 3: System Overview example, the T1 Channel Bank can be monitored, controlled, and configured for the various applications via a user-friendly terminal. This reduces the need to set switches manually on the plug-in cards. See Fig. 3-1.
Modem
MT400A
Modem
MT400A MT400A
Terminal
Modem
MT400A
Fig. 3-1. MCC Control of Multiple Sites Using DS0 Channel or Dial Network in Case of Failure.
17
T1 CHANNEL BANK
For new installations, the T1 logic cards must be set to the proper frame configuration, and the T1 must be entered correctly into the system network timing plan and coordinated with the master clock.
The MCC communicates with the VT100 or VT52 terminals through a serial RS-232 data link on the rear MCC card.
Application #1: Data Only or Voice and Data
T1 combines multiple voice channels over one set of wires going to various locations. You can use telephone-company services, or you can use your own microwave, satellite, coaxial-cable, or fiberoptic links between sites. The set of rear plug-in cards provides economical flexibility to interface with standard telephone equipment. An interface for analog modems permits integration of 3002 privateline voice-band services with digital access facilities.
In sending data, you can achieve higher speeds than the limit of 9600 bps or the 56 Kbps of DDS circuits.
See Fig. 3-2.
Stat
Mux
Stat
Mux
T1 Channel
Bank
T1 Channel
Bank
PBX PBX
Fig. 3-2. Data-Only or Voice-Plus-Data Communications.
18
CHAPTER 3: System Overview
Application #2: Point-to-Point
You can increase throughput in increments of N x
56 Kbps or N x 64 Kbps (where N = 1 to 24) all the way to 1,536 Kbps. Typical applications include bridging your local area networks (LANs), connecting CAD/CAM workstations, and even video for slow-scan or data-compressed teleconferencing. See Fig. 3-3.
PBX
LAN
T1 Channel
Bank
Multiple
DS0s
POP
AT&T
MCI
SPRINT
T1 Channel
Bank
Multiple
DS0s
Host
LAN
Fig. 3-3. Point-to-Point Multiplexing: High-Speed Data.
19
T1 CHANNEL BANK
Application #3: Fractional T1 Networking
Using network standards, the T1 Channel Bank can connect several sites together using fractional T1 facilities as a backbone. The DACS at the central office will route DS0s to your destination. Fractional
T1 operates N x 56 and N x 64. With an MCC installed in the T1 Channel Bank, this subset of the
T1 applications allows you to use and pay for only the bandwidth that you need and not for extra channels. See Fig. 3-4.
1
24
MT400A
T1
POP
3002 Lines
DDS
SW 56K
Fractional T1
Long Distance
Enhanced T1 Services
Local Ex Service
Modem
CSU/DSU
MT400A
Fig. 3-4. Fractional T1 Networking.
1
24
20
CHAPTER 3: System Overview
Application #4: OCU-DP Card Sets
If you have a DSU/CSU network already in place and want to take advantage of the DSU/CSU network management system (NMS), the T1
Channel Bank can still be placed into the network to save line cost and still allow the DSU/CSU NMS to function. See Fig. 3-5.
Central Database
Site
1
Maryland
POP
T1 Channel
Bank
24
DSU/CSU
DSU/CSU
Virginia
POP
LEC
DSU/CSU
POP
Washington,
D.C.
LEC
DSU/CSU
LEC=Local exchange carrier
Fig. 3-5. OCU-DP Application.
21
T1 CHANNEL BANK
Application # 5: Dual Modems
Dual modem cards save rack space. In standard dialin applications with channel banks and modems, a typical application could look like Fig. 3-6 and require 28 inches of rack space compared to the 7 inches required by the DMC. For example, multiple modems from the field dial in to make a connection to the host at the central site. The telco acts as a rotary group for the modems. For the standard application, these are the space requirements:
• T1 Channel Bank— 7 inches (17.78 cm)
• Standard Modem Rack
DTE
1 1
Modem
IXC or LEC
Host
24
Standard
Modem Rack
24
T1 Channel
Bank
Modem
Fig. 3-6. A Standard Dial-In Application with Channel Banks and Modems.
PC
22
Making a Standard Dial-in Call
• A modem from the field calls in to an 800 number at the central site.
• The telco signals the T1 Channel Bank incoming call.
• The FXS card rings the local modem.
• After 2-6 seconds, the local modem answers the call and starts the handshake with remote modem.
• It takes from 12 to 30 seconds to finish the handshake. This includes type of modulation scheme, MNP ® error correction, and speed.
• The modems connect and the PC attaches to the host.
Disconnecting
• The PC disconnects from the remote modem and DTR drops.
• The remote modem goes on hook.
• The telco signals the T1 Channel Bank of the on-hook condition.
• The FXS card drops the loop to the central modem.
• The modem disconnects from the host.
• Total time is 2-10 seconds.
CHAPTER 3: System Overview
Disadvantages of Standard Dial-in Application
(Fig. 2-6)
• It takes 12-36 seconds to get the modems to train.
• Because the disconnect takes time, the modems are not available for the next call.
• Three conversions are necessary—analog to digital (far end), digital to analog, and analog to digital (near-end). This conversion accounts for loss of signal quality, and it increases the S/N ratio.
Advantages of the Dual Modem Card (Fig. 3-7)
With the DMC, fewer modems give the same amount of blocking. Using the DMC in the T1
Channel Bank, you gain several advantages as shown in Fig. 2-7:
• No analog card (FXS) in the prod name.
• No analog in the central modem.
• Connect and disconnect times can be less than one second.
• You have a better S/N ratio and fewer errors.
• The DMC requires only 7 inches of rack space.
23
T1 CHANNEL BANK
DTE
1
Host
24
IXC or LEC
T1
T1 Channel
Bank LEC=Local exchange carrier
IXC=Inter exchange carrier
Fig. 3-7. Dual Modem Card Application.
Modem
Modem
Dial-in from remotes
PCs
Making a Call with the DMC
• A modem from the field calls in to an 800 number at the central site.
• Telco signals the Channel Bank, which attaches the modem immediately.
• The modem connects in a few seconds, attaching the PC to the host.
Disconnecting with the DMC
• The PC disconnects from the remote modem and DTR drops.
• The remote modem goes on hook.
• Telco signals the Channel Bank of the on-hook condition and drops DTR to host. This takes less than one second.
• The modem is available for the next call.
24
CHAPTER 4: Pre-Installation Considerations
4. Pre-Installation Considerations
4.1 Unpacking
The T1 Channel Bank is shipped with proper shock insulation material. If you need to return the unit for any reason, use the original shipping carton.
Failure to comply may result in voiding the equipment warranty. Follow this procedure while unpacking the unit:
1. After opening the shipping carton, locate the packing list and check the contents. Besides this guide, you should find all the items that you ordered. Verify this with your ordering information. DO NOT handle bare printed circuit cards before you read this caution:
CAUTION
Components on the printed circuit cards will be damaged by electrostatic discharge. Use proper grounding techniques for all tools and work areas when you handle these cards. While installing or removing the printed circuit cards, GRASP BY THE EDGE
ONLY. Take care not to touch any circuit paths, component leads, or edge connectors.
2. Inspect all the items for damage that may have occurred during shipment. If there is damage, contact the shipping agent. If you have further questions about damaged or missing parts, contact your dealer.
3. Using the inventory forms in Table 4-1 and
Table 4-2 , record all part/model numbers, software revision identifiers, and card/slot positions for components that belong to each chassis. There is a separate inventory form for chassis 1 and for chassis 2. Write on this form as you unpack the items from the shipping carton and inspect them. If there is a need to contact your dealer for any reason later concerning some of these parts, you have an accurate reference.
4. Turn to Appendix B and complete the site survey before installing the T1 Channel Bank.
Having the information on hand will make installation easier. It will also alert you to areas that may require more preparation before you begin the installation.
25
T1 CHANNEL BANK
Item Description
26
12
13
14
15
8
9
10
11
6
7
4
5
1
2
3
16
17
18
19
20
21
Table 4-1. Chassis 1 Inventory Form
Part Number Serial Number Software Card Slot
Revision Number Position
Item Description
12
13
14
15
8
9
10
11
6
7
4
5
1
2
3
16
17
18
19
20
21
CHAPTER 4: Pre-Installation Considerations
Table 4-2. Chassis 2 Inventory Form
Part Number Serial Number Software Card Slot
Revision Number Position
27
T1 CHANNEL BANK
4.2 Installation Procedure
Recommended Sequence:
1. Unpack the equipment. (See Section 4.1.)
2. Identify the pieces required for your configuration and verify plug-in cards.
(Compare with order information.)
3. Install the shelf in a permanent location.
(See Chapter 5.)
4. Begin the hardware configuration setup.
(See Chapter 6.)
5. Set headers and install plug-in cards. Power up the system. (See Chapter 7.)
6. Configure network management menu choices. (See Chapter 8 and Chapter 9.)
7. Make software configuration menu choices.
(See Chapter 10.)
8. Set up the system network timing plan.
(See Chapter 11.)
9. Run short tests to verify that the equipment functions satisfactorily. (See Chapter 12.)
4.3 Operating Environment
Site Location
In addition to the space required by the T1
Channel Bank and its accessories, as shown in
Table 4-3 below, the site plan must take into consideration the space requirements for addressing the I/O cables, termination blocks, etc. A site survey is included in Appendix B. See
Table 4-22 for general cable guidelines. A minimum maintenance access aisle of 2 is recommended for troubleshooting and plug-in card replacement, both in front of and behind fixed racks.
Unit
Channel Bank shelf
Utility shelf
Ring generator/ power supply
UL ® baffle
Height, inches
7
7
5-1/4
1-3/4
Table 4-3. Space Requirements.
Width, inches
19
19
2-3/4
19
Depth, inches Rack Spaces
20
20
7-1/2
4
4
1 KTU space
20 1
28
FCC Rules, Part 68 require that all T1 equipment interfacing to 1.544-Mbps digital services and the public switched telephone network must be registered under FCC Part 68 or be installed behind registered protective circuitry.
The chassis can be mounted in a rack. Use the mounting ears for front flush-mounting as in a cabinet, or they can be attached further back for center gravity rack mounting. See Fig. 4-1.
CHAPTER 4: Pre-Installation Considerations
'A' active
Shelf 1 Slot 1
'A' CONFIGURATION MENU
MCC MCCNET Ok
Thur 16:36:27
Mode Name: Penril
Switch S1
On
Off
1 2 3 4 5 6 7 8
4
On
Off
On
Off
On
5
On
Off
Off
On
On
6
Off
On
On
On
On
MCC Baud Rate
1200 Baud
2400 Baud
4000 Baud
9600 Baud
19200 Baud
Switches 1,2,3,7,8 Not Used
Switch S2
On
Off
On
1 Expansion Shelf
2 MCC Dominant
3 Penril Test
4 Configured CB
5 VT-52 Terminal
6-8 Not Used
1 2 3 4 5 6 7 8
Off
Standard Shelf
Chan Cards Dominant
Normal
Normal Mode
VT-100 Terminal
ESC - Previous Menu
Fig. 4-1. Front Mount and Mid-Rack Mounts.
29
T1 CHANNEL BANK
Power Requirements
Channel Bank Shelf:
• 115-VAC ±10% 60 Hz or -48 VDC
• Single shelf (fully loaded): 65 watts or 115 watts
• Dual shelves with power redundancy: 195 watts,
345 watts
AC or DC Ring Generator/48V Power Supply:
• -48 1.5 VDC at 1.25 A, switch selectable
(overload protected at 1.10 to 1.40 times rated load)
• Nominal 96 VAC, 86 Vrms minimum, 150 V peak maximum (when switched off, output less than
0.5 V)
• 20 1 Hz
Interface
4W E&M
2W FXS
2W FXO
OCU-DP
DDC OCU-DP
High Speed Data
DMC
48 V and Ring Power Requirements:
Environmental Conditions
Temperature: 0°C to 50°C
Humidity: 10-90% relative humidity, non-condensing
Table 4-4. Ring Power Requirements
-48 V
24 Channel Group
Ring voltage
Required
Required
Required
Required
Required
N/A
N/A
N/A
Required
N/A
N/A
N/A
N/A
N/A
30
4.4 Cabling Requirements
As with any installation of this type of equipment, you should complete a cabling plan prior to installation. Complete the site survey in Appendix
B . See the following pages for some wiring pin diagrams and the list of cables.
Your plan should address the following:
• Placement of power outlets
• Ground wires
• T1 cables
• Voice cables
• Termination blocks
• Data cables
• MCC cables
• Special cables (control and alarm cabling)
CHAPTER 4: Pre-Installation Considerations
Having a ground plan is important for the following reasons:
• It provides a ground path for ground start and
E&M signaling circuits.
• It provides electrical safety.
• It prevents unwanted radio-frequency signals.
• It prevents ground loops.
There are three ground circuits:
• Frame (or chassis) ground
• Battery/ring ground
• Power ground
See Fig. 4-2 for proper grounding. The ground wire should be 6-gauge twisted copper wire, and the reading should be 0-2 ohms.
AC outlet
Channel bank
AC plug
Ohm meter
Earth ground
Fig. 4-2. Ground Plan for Installation.
31
T1 CHANNEL BANK
4.5 Wiring Pin Diagrams
DSX-1 Card (MT441C)
Refer to Fig. 4-3 to locate the parts for the pin assignments in Tables 4-5 through 4-7.
C
S
U
STATUS
XMT
REV
MONITOR
CONTROL
Test jacks
DB15 female connector
Modular 6 pin female connector
3
2
1
6
5
4
Fig. 4-3. DSX-Card Connectors.
Table 4-5. Control Interface Assignments Used for Redundant T1 Logic Cards.
RJ-11 Pin
4
5
6
1
2
3
Lead Name
+5V
+12V
GND
GND
Control signal
Control signal
32
Pin
12
13
14
15
8
9
10
11
6
7
4
5
1
2
3
CHAPTER 4: Pre-Installation Considerations
Table 4-6. CSU Interface Assignments
Lead Name
TX Tip
GRD TX 1, 9
RX Tip
GRD RX 3, 11
Not connected
Not connected
Not connected
Not connected
TX Ring
Not connected
RX Ring
Not connected
Not connected
Not connected
Not connected
Direction
Out
—
In
—
Out
In
33
T1 CHANNEL BANK
CSU Rear Card (MT465C)
DB15
3
4
1
2
9
11
I
L
N
E
CSU
STATUS
XMT
REV
MONITOR
Test jacks
1
8
9
15
DB15 female connector
CONTROL
Fig. 4-4. CSU Rear Card.
Table 4-7. DSX-1 Rear Card with CSU.
Lead Name Direction
XMT data (T1)
Frame GND
RCV data (T)
Frame GND
XMT data (R1)
RCV data (R)
Out
—
In
—
Out
In
34
CHAPTER 4: Pre-Installation Considerations
MCC Rear Card (MT443C)
MCC
STATUS
Pin 1
D
C
E
Pin 9
Pin 9
Pin 1
D
T
E
MCC NET
NETWORK
Modular 8 pin female connector
DB-9 male connectors
8
7
6
5
4
3
2
1
DB9 Pin
7
8
5
6
3
4
1
2
9
Fig. 4-5. MCC Rear Card Connectors.
Table 4-8. MCC Rear Card Interfaces.
DCE
Not connected
RxD
TxD
DTR
GND
DSR
RTS
CTS
Not connected
Direction
Out
In
In
Not used
Out
In
Out
DTE
DCD
RxD
TxD
DTR
GND
DSR
Not connected
Not connected
Not connected
Direction
In
In
Out
Out
Not used
In
35
T1 CHANNEL BANK
Table 4-9. MCC Net Series 6000 Interface.
RJ-45 pin
4
5
6
FXS 2 Wire Voice and FXO 2 Wire Voice
FXS (MT411C), FXO (MT412C)
These diagrams show all four circuits.
See Fig. 4-6 and Table 4-10.
DTE
GND
RX data
TX data
Direction
Not used
In
Out
2W
FXO
STATUS
CH 1
CH 2
CH 2
CH 3
CH 3
CH 4
CH 4
Modular 6 pin
female
6
5
4
2
1
Fig. 4-6. FXS and FXO 2-Wire Voice Connectors.
36
CHAPTER 4: Pre-Installation Considerations
Table 4-10. FXS and FXO 2-Wire Voice Interface
RJ-11 pin
4
5
6
1
2
3
4-Wire E & M Voice (MT410C)
All four circuits are shown in these pinouts.
See Fig. 4-7 and Table 4-11.
Lead name
Not connected
Not connected
RING
TIP
Not connected
Not connected
4V
E&M
STATUS
CH 1
CH 2
CH 2
CH 3
CH 3
CH 4
CH 4
Modular 8 pin
female connector 8
7
6
5
4
3
2
1
Fig. 4-7. 4-Wire E&M Voice Connectors.
37
T1 CHANNEL BANK
Table 4-11. 4-Wire E&M Voice Interface.
RJ-45 pin
6
7
4
5
1
2
3
8
4 Wire AD (Analog) (MT418C)
All four circuits are identical and are shown in these pinouts. See Fig. 4-8 and Table 4-12.
Lead name
E (Ear)
M (Mouth)
T1 (Tip)
R (Ring)
T (Tip)
R1 (Ring)
EG (E-lead Ground)
MB (M-lead Battery)
Signal direction
Out
In
Out
In
In
Out
—
—
4W
AD
STATUS
CH 1
CH 2
CH 2
CH 3
CH 3
CH 4
CH 4
Modular 8 pin female connector
8
7
6
5
4
3
2
1
Fig. 4-8. 4-Wire AD Connectors.
38
RJ-45 pin
6
7
4
5
1
2
3
8
V.35 Data (MT451C)
CHAPTER 4: Pre-Installation Considerations
Table 4-12. 4-Wire AD (Analog) Interface.
Signal direction Lead name
Not connected
Not connected
T1 Tip
R Ring
T Tip
R1 Ring
Not connected
Not connected
Out
In
In
Out
HSD
V.35
STATUS
NN
B
DCE
Female screw
MM
A
34-pin female connector
Male screw
DCE
Fig. 4-9. V.35 Data Connectors.
39
T1 CHANNEL BANK
Pin
U
V
W
X
S
T
P
R
Y
AA
D
E
F
H
A
B
C
RS-232 (MT453C)
Table 4-13. V.35 DCE Interface.
Lead name
Frame ground
Signal ground
RTS
CTS
DSR
DCD
DTR
TxD—A
RxD—A
TxD—B
RxD—B
TTxC—A
RxC—A
TTxC—B
RxC—B
TxC—A
TxC—B
Signal direction
In
Out
In
Out
In
Out
In
Out
Out
Out
—
—
In
Out
Out
Out
In
RS-232
STATUS
Pin1
25 pin female connector
DCE
Fig. 4-10. RS-232 Connectors.
40
Pin
12
13
14
15
8
9
10
11
6
7
4
5
1
2
3
20
21
22
23
16
17
18
19
24
25
CHAPTER 4: Pre-Installation Considerations
Table 4-14. RS-232 Interface.
Signal direction Lead name
Chassis GND
TxD
RxD
RTS
CTS
DSR
Signal GND
DCD
Not connected
Not connected
Not connected
Not connected
Not connected
Not connected
Tx CLK
Not connected
Rx CLK
Not connected
Not connected
DTR
Not connected
Not connected
Not connected
Ext CLK
Not connected
In
Out
In
Out
Out
Out
Out
Out
In
In
41
42
T1 CHANNEL BANK
RS-530
STATUS
Pin1
25 pin female connector
DCE
Fig. 4-11. RS-530 Connectors.
RS-530 (MT452C)
Pin
19
20
21
22
15
16
17
18
23
24
25
11
12
13
14
7
8
9
10
5
6
3
4
1
2
CHAPTER 4: Pre-Installation Considerations
Table 4-15. RS-530 Interface.
Lead name
Chassis GND
TxD—A
RxD—A
RTS—A
CTS—A
DSR—A
Signal GND
DCD—A
RxC—B
DCD—B
TTxC—B
TxC—B
CTS—B
TxD—B
TxC—A
RxD—B
RxC—A
Not connected
RTS—B
DTR—A
Not connected
DSR—B
DTR—B
TTxC—A
Not connected
Signal direction
Out
Out
Out
In
Out
Out
In
Out
Out
Out
In
Out
In
Out
Out
In
In
Out
In
In
43
T1 CHANNEL BANK
Office Channel Unit Data Port (MT476C)
OCU-DP
STATUS
CH 1
CH 2
Modular 8 pin female connector
8
7
6
5
4
3
2
1
5
6
3
4
1
2
7
8
RJ-45S Channels
1 and 2
Fig. 4-12. Office Channel Unit Data Port.
Table 4-16. OCU-DP Interface.
Lead name Direction
Receive data (Tip)
Receive data (Ring)
Not used
Transmit data (Ring) (R1)
Transmit data (Tip) (T1)
Input
Not used
Output
44
CHAPTER 4: Pre-Installation Considerations
DSU RS-232 Dual Data Connector (MT473C)
DSU-DP
RS-232
STATUS
Pin1
26 pin female connector
CH 1
CH 2
Fig. 4-13. Dual Data RS-232 Connector.
45
46
T1 CHANNEL BANK
Pin
20
21
22
23
16
17
18
19
24
25
26
12
13
14
15
8
9
10
11
6
7
4
5
1
2
3
Table 4-17. DSU RS-232 Interface.
Lead name
Chassis GND
TxD
RxD
RTS
CTS
DSR
Signal GND
DCD
Not connected
Not connected
Not connected
Not connected
Not connected
Not connected
Tx CLK
Not connected
Rx CLK
Not connected
Not connected
DTR
Not connected
Not connected
Not connected
Ext CLK
Not connected
Shield and chassis ground
Signal direction
In
Out
In
Out
Out
Out
Out
Out
In
In
CHAPTER 4: Pre-Installation Considerations
DSU RS-530 Dual Data Connector (MT472C)
DSU-DP
RS-530
STATUS
Pin1
26 pin female connector
CH 1
CH 2
Fig. 4-14. Dual Data RS-530 Connector.
47
48
T1 CHANNEL BANK
Pin
20
21
22
23
16
17
18
19
24
25
26
12
13
14
15
8
9
10
11
6
7
4
5
1
2
3
Table 4-18. DSU RS-530 Interface.
Lead name
Chassis GND
TxD—A
RxD—A
RTS—A
CTS—A
DSR—A
Signal GND
DCD—A
RxC—B
DCD—B
TTxC—B
TxC—B
CTS—B
TxD—B
TxC—A
RxD—B
RxC—A
Not connected
RTS—B
DTR—A
Not connected
DSR—B
DTR—B
TTxC—A
Not connected
Shield and chassis ground
Signal direction
In
In
Out
In
In
Out
Out
Out
In
Out
Out
In
Out
Out
Out
In
Out
In
Out
Out
DSU V.35 Dual Data Connector (MT471C)
Pin1
26 pin female connector
DSU-DP
V.35
STATUS
CH 1
CHAPTER 4: Pre-Installation Considerations
CH 2
Fig. 4-15. High Density DSU V.35 Connector.
49
50
T1 CHANNEL BANK
Pin
14
15
16
17
8
9
11
12
20
24
6
7
4
5
1
2
3
Table 4-19. DSU V.35 Interface.
Lead Name
Frame ground
TxD—A
RxD—A
RTS
CTS
DSR
Signal ground
DCD
RxC—B
TTxC—B
TxC—B
TxD—B
TxC—A
RxD—B
RxC—A
DTR
TTxC—A
Signal Direction
Out
Out
In
Out
In
Out
Out
Out
In
In
—
In
Out
In
Out
Out
—
CHAPTER 4: Pre-Installation Considerations
Dual Modem Rear Cards (6950-43, -45)
Pin1
26 pin female connector
C
H
1
C
H
2
DMC
RS-232
STATUS
DIAG
Modular 8 pin female connector
8
7
6
5
4
3
2
1
Fig. 4-16. Dual Modem Rear Card Connectors for RS-232, RS-530, V.35, or RJ-45.
51
52
15
16
17
18
11
12
13
14
19
20
7
8
9
10
5
6
3
4
TxC
—
RxC
ALB
—
—
RI
SI
—
DTR
—
—
GND
DCD
RxD
RTS
CTS
DSR
—
In
Out
—
Out
In
—
—
In
Out
—
—
—
Out
Out
In
Out
Out
13
14
15
16
9
10
11
12
17
18
19
20
7
8
5
6
2
3
4
T1 CHANNEL BANK
RS-232
Pin
1
Table 4-20. Dual Modem Rear Card Interface.
Lead name Direction Pin
Frame ground
TxD
—
In
1
2
RS-232 Jacks
RS-530
Lead name Direction Pin
Frame ground
— 1
TxD—A In 2
RxD—A Out
RTS—A In
CTS—A Out
DSR—A Out
GND —
DCD—A Out
RxC—B Out
DCD—B Out
TTxC—B In
TxC—B Out
CTS—B —
TxD—B In
RxD—B Out
RxD—B Out
RxC—A Out
— —
RTS—B In
DTR—A In
19
20
15
16
17
18
11
12
13
14
7
8
9
10
5
6
3
4
V.35
Lead name Direction
Frame ground
—
TxD—A In
RxD—A Out
RTS In
CTS
DSR
Out
Out
GND
DCD
—
Out
RxC—B Out
DCD —
TTxC—B In
TxC—B Out
— —
TxD—B In
TxC—A Out
RxD—B Out
RxC—A Out
— —
—
DTR
—
In
CHAPTER 4: Pre-Installation Considerations
Table 4-20. Dual Modem Rear Card Interface.
22
23
24
25
RS-232 RS-530 V.35
Pin Lead name Direction Pin
21 RDL In 21
RI
SS
TTxC
TM
Out
In
In
Out
22
23
24
25
RS-232 Jacks
Lead name Direction Pin
— — 21
DSR—B Out
DTR—B In
TTxC—A In
— —
22
23
24
25
Lead name Direction
— —
—
—
TTxC—A In
— —
—
—
Pin
1
4
5
2
3
6
7
8
Table 4-21. Dual Modem Rear Card Interface for RJ-232.
RJ-232 Jacks, DCE
Lead name
DSR
DCD
DTR
GND
RxD
TxD
CTS
RTS
Direction
Out
Out
In
Power
Out
In
Out
In
53
T1 CHANNEL BANK
4.6 List of Cables
Part number
EHN080-0015-MM
EHN081-0015-MF
EHN080-0015-MF
EHN081-0015-MM
EHN082
Table 4-25. T1 Channel Bank Cables.
Item description
HD DB26M—DB25M
HD DB26M—V.34/M34F
HD DB26M—DB25F
HD DB26M—V.35/M34 M
T1-CB Utility Pwr Cable
54
CHAPTER 4: Pre-Installation Considerations
4.7 List of Parts with Part Numbers
Table 4-23. Parts to Order (Excluding the Cables).
Part number
MT400A
MT437C, MT435C
MT436C
MT400A
MT400A
MT442C
MT443C
MT400A
MT445C, MT446C
MT445C, MT447C
MT445C, MT448C
MT450C, MT451C
MT450C, MT452C
MT450C, MT453C
MT418C
MT475C, MT476C
MT420C-35
MT420C-530
MT420C-232
MT482C, MT481C
MT482C, MT483C
MT425C
MT426C
MT415C-35
MT415C-530
MT415C-232
MT410C
MT411C
MT412C
MT430C
MT419C
MT440C
MT441C
MT465C
MT457
Item Description
14-slot chassis (included in basic unit of T1 Channel Bak)
AC power front card (included in basic unit of T1 Channel Bank)
AC rear module (included with chassis)
T1 logic front card (included in basic unit of T1 Channel Bank)
T1 logic rear card (included in basic unit of T1 Channel Bank)
MCC logic front card (included in basic unit of T1 Channel Bank)
MCC logic rear card (included in basic unit of T1 Channel Bank)
Basic unit: T1 mux
Hardware options
Monitor control configure (MCC card)
Quad voice card—E&M
Quad voice card—FXS
Quad voice card—FXO
High speed data—V.35
High speed data—RS-530
High speed data—RS-232
4-wire analog card (for modems)
T1 common logic cards
T1 common logic cards with CSU
OCU-DP subrate 9600
Dual V.35 card set
Dual RS-530 card set
Dual RS-232 card set
Dual modem card 19.2 with DB25
Dual modem card 19.2 with RJ-45
T1-CB Dual ModemCard 14.4 Sync
T1-CB Dual Modem card 14.4 Async
T1-CB HS Data Card-V.35
T1-CB HS Data Card-530
T1-CB HS Data Card-232
T1-CB 4W E&M Card
T1-CB FXS Card
T1-CB FXO Card
T1-CB Bat/Ring Gen
T1-CB OCU-DP 56/64
T1-CB T1 Front Card
T1-CB DSX-1 Rear Card
T1-CB CSU Rear Card
T1-CB Utility Shelf w/AC
55
56
T1 CHANNEL BANK
MT442C
MT443C
MT445C
MT446C
MT447C
MT448C
MT450C
MT451C
MT452C
MT453C
MT460C
MT462C
MT470C
MT476C
MT471C
MT472C
MT473C
MT438C
MT439C
MT437C
Table 4-23. Parts to Order (Excluding the Cables) (continued).
Part number
MT435C, MT437C
MT436C
Item Description
Hardware spare parts
AC power front card
AC power rear card
T1 logic front card
T1 logic rear card
MCC front card
MCC rear card
Quad voice front card
Quad E&M rear card
Quad FXS rear card
Quad FXO rear card
High speed data front card
High speed data V.35 rear card
High speed data RS-530 rear card
High speed data RS-232 rear card
14-slot chassis with rear AC power module (low power)
Utility shelf (low power)
Redundant logic relay
Quad 4-wire E&M with levels 0/0
Analog rear card
Blank rear card—thin
Dual data high speed front card
OCU-DP dual rear card
DC power rear card (low power)
Dual V.35 rear card
Dual RS-530 rear card
Dual RS-232 rear card
Dual high speed subrate front card
DC power front card, 65 watts
DC power front card, 115 watts
AC power front card, 115 watts
CHAPTER 4: Pre-Installation Considerations
Table 4-23. Parts to Order (Excluding the Cables) (continued).
Part number
MT482C
Item Description
14-slot chassis with DC power (low power)
Expansion chassis with DC power (low power)
Dual modem card V.32bis front
Dual modem card with DB25 rear
Dual modem card 19.2 front
Dual modem card with RJ-45 rear
14-slot chassis (new, high power) with AC
Rear AC power module (high power)
Rear DC power module (high power)
New 14-slot chassis (high power)
4.8 Installation Time
Installation normally takes a few hours to complete, but it varies according to application and how familiar the installer is with the equipment on the premises.
4.9 Installation Equipment
• VT100, VT52, equivalent terminal, or PC emulation software
• Small screwdriver set to secure rear plug-in assemblies
• Screwdriver for 19" rack-mounting
4.10 Optional Installation Equipment
• T1 test equipment
• Voice-signaling test equipment
• Bit error rate test set
• Ohmmeter
57
T1 CHANNEL BANK
5. Shelf Description and Installation
5.1 Standard Single Shelf
The standard 14-slot chassis is 7" high without the heat baffle (fits 4 rack units) or 8.75" high with the heat baffle (5 rack units). It weighs 14 pounds with baffle and ears assembly and without any plug-in assemblies. It is 20" deep and 19" wide. See
Fig. 5-1 .
The standard shelf assembly houses 14 plug-in cards that can be inserted into any slot position.
When the shelf assembly is ordered from the factory as a basic unit, it comes with a power supply (front and rear), T1 (front and rear) card, and MCC
(front and rear) card. Any card can be assigned to any channel through the MCC. If you choose the dumb mode of operation— with no MCC and voice only— use table 1 for card placement. The cards must be installed as explained in the following pages.
If a card is in the dumb mode, it will be reported to the MCC as in the dumb mode. You can set the switches on the MCC to the soft-configured channel bank mode and program the channel bank for dumb mode. Then you can remove the MCC.
58
CHAPTER 5: Shelf Description and Installation
20"
20
7"
1 1 1 1 1 1 1 8 9 10 11 12 13 14
Baffle
Ear
Power
Supply
Fig. 5-1. The Standard Shelf.
Table 5-1. Standard Shelf Slot and Time Slot Positions (for voice only without an MCC card).
EAST T1
1 2
1 5
2 6
3 7
4 8
3
9
10
11
12
4
13
14
15
16
5
17
18
19
20
6
21
22
23
24
*
*
*
7
*
Shelf slot position
WEST T1
8
*
9
1
*
*
*
2
3
4
6
7
10
5
8
11
9
10
11
12
12
13
14
15
16
13
17
18
19
20
14
21
22
23
24
*=slots for T1 logic card referenced to a hard-wired (dumb) mode
59
T1 CHANNEL BANK
Each slot position houses a front and a rear set of plug-in cards. The front card houses the functional logic, and the rear plug-in provides the interface logic and connectors.
NOTE
Table 5-1 displays all possible channel locations. For an actual installation, only the East or the West channels would be used.
Through changing a header strap, the shelf may be configured as shelf 1 (first 14 slots). See
Fig. 5-13 . When the Channel Bank does not come equipped with an MCC, the slot positions have the default function, and the cards must be configured for hard-wired mode as explained in Chapter 5. See
Table 5-1 .
5.2 Shelf Accessories
Rackmounting Brackets
You will find brackets included with the shelf to support two types of rackmounting.
1. Install the mounting brackets on the shelf using the screws provided. You can orient the brackets for a front mount or a mid-unit mount. Notice the Telco holes in Fig. 5-4 and 5-5 for positioning the equipment on the racks.
2. Attach the heat baffle to the bottom of the shelf. See Fig. 5-3. The shelf unit comes with a heat baffle accessory that you attach with four screws to the bottom of the shelf. The baffle is intended to act as an enclosure bottom for open rack configurations and a protection against heat rise. Metal plates are used to attach two chassis to form one unit. See
Fig. 5-2 for an example of a 14-slot chassis with baffle and utility shelf and a second 14-slot chassis with a baffle.
CAUTION
To properly assemble the system, you must follow the configuration shown in
Fig. 5-2. This arrangement is for either a single shelf or a single shelf with utility shelf (for power redundancy).
You must install the baffle to maintain
UL ® compliance.
60
CHAPTER 5: Shelf Description and Installation
Expansion chassis,
14 slot
Steel straps
Steel straps
Baffle
Fig. 5-2. Heat Baffle and Connecting Straps.
Utility shelf
Steel straps
14 slot standard shelf
61
T1 CHANNEL BANK
62
PWR PWR
KTU mounting area
Steel straps
Standard shelf and front panel
Secure baffle by using three front brackets and the brackets
Secure baffle by using three front brackets and the brrackets in the rear.
Fig. 5-3. Attaching Heat Baffle to Shelf Bottom.
Mounting the Chassis: Front Mount
3. Screw the unit into the front of the rack. If there is a large number of modules in the rack, the rack can get quite heavy, placing a large stress on the mounting ears. This is illustrated in
Fig. 5-4 . You may want to add rear support brackets to support the weight. You can buy the hardware with your cabinet.
CHAPTER 5: Shelf Description and Installation
Mounting the Chassis: The Mid-Unit Rack Mount
3. This mount gives the unit a better balance. It mounts the unit in the middle, hanging half over the rack. See Fig. 5-5.
Side view of chassis mounted by ears with baffle
Fig. 5-4. Front Rack Mounting.
63
64
T1 CHANNEL BANK
Front of chassis, without baffle
Fig. 5-5. Mid-unit Rack Mounting.
48V Power and Ring Generator(s)
4. Install the -48 VDC power and ring generator above the shelf in the KTU mounting space if you are using the utility shelf setup as shown in
Figures 5-6 and 5-7. If you do not have a utility shelf, install it directly above the multiplexer chassis as shown in Figures 5-8 and 5-9.
WARNING
When working around the ringing generator as well as all voice cards, care should be taken because of AC ring voltage at 20 Hz.
CHAPTER 5: Shelf Description and Installation
Ring generator and talk battery supply.
BAFFLE
Fig. 5-6. Installing -48V power and ring generator in KTU mounting space.
65
66
T1 CHANNEL BANK
REAR UTILITY SHELF
POWER
ON to AC
FRAME
GROUND
120Vac 60Hz
Power
Switch
+5V, GND
+5V, -5V+, +12V,
-12V, GND,
FRAME GND
D
C
+5V, GND
P
O
W
E
R
+5V, -5V+, +12V,
-12V, GND,
FRAME GND
STANDARD SHELF to AC Inlet
Fig. 5-7. Installing -48V power and ring generator. Use this mounting plan if you have a utility shelf.
CHAPTER 5: Shelf Description and Installation
Power supply and ring gen.
Secure baffle by using three front brackets and brackets in the rear.
Fig. 5-8. Installing -48V power and ring generator. Use this mounting if you do not have a utility shelf.
67
68
T1 CHANNEL BANK
Power Switch
Ring and
48 V
Power
Source
AC Cord
Power Switch
Ring and
48 V
Power
Source
AC Cord
AC Cord
AC Inlet
Telco Wire
DC
Terminal
Block
Do Not
Connect
Fig. 5-9. Installing -48V and ring generator with no utility shelf layout (rear view).
CHAPTER 5: Shelf Description and Installation
Rear Utility Shelf
Space for ring generators
& power supplies
FRAME
GROUND
POWER
ON
-48
VDC
FGND
+5V, GND
+5V, -5V+, +12V,
-12V, GND,
C
FRAME GND
+5V, GND
P
O
W
E
R
+5V, -5V+, +12V,
-12V, GND,
FRAME GND
Front Utility Shelf
PWR
Space for power supplies
Space for power supply
Regulated DC power supply and and ring generator ring gen. with lamp output
Fig. 5-10. DC Utility Shelf Layout.
69
T1 CHANNEL BANK
5.3 Shelf Block Diagram
Figure 5-11 is a block diagram illustrating the architecture of the standard/split shelf and utility shelf. This diagram illustrates three types of busses:
• Rear access only (only accessible to rear plug-ins)
• Front and rear access (accessible to both plug-ins)
• Front to rear links (providing connectivity between a front plug and rear plug)
Basic Types of Bus Links:
Rear Access Only
• RNG/Bat voltage bus—This set of bus links provides connectivity of telephone signaling voltages and grounds to the rear voice-card sets.
Front Access
• The internal T1 bus(es) (East and West) provides the (traffic) paths for the voice and data signals between a T1 logic card and associated channel cards.
• The MCC bus is a shelf communication link that enables the monitor control and configuration
(MCC) system to communicate with all plug-in cards.
• The system clock bus provides synchronous timing signals called the system clock to all logic cards. The East (T1) card set (primary or standby) feeds the system clock. The East card can be configured to synchronize this system clock to internal or receive timing signals.
Front and Rear Access
• The power bus provides 5V and 12V and power grounds to all plug-in cards.
• The signaling bus provides a path between the
T1 logic cards and the plug-in channel cards for the signaling A, B, C, and D bits as defined in the AT&T standards.
Front-to-Rear Links
The front-to-rear links provide the interconnections between a front plug-in card and a rear plug-in card. Each slot position has its own set of links.
These buses are used for providing connectivity of channel signal paths, configuration control, and signaling selection.
70
CHAPTER 5: Shelf Description and Installation
CHASSIS #1
INT POWER BUS
AC INPUT
POWER
SUPPLY
PWR
OUTPUT
AC INPUT
POWER
SUPPLY
PWR
OUTPUT
AC INPUT
POWER
SUPPLY
PWR
OUTPUT
UTILITY SHELF
AC INPUT
POWER
SUPPLY PWR
OUTPUT
FRONT
PLUG
SLOT
FRONT
PLUG
SLOT
FRONT
PLUG
SLOT
INT POWER BUS
Front to rear bus links
Ext RNG/BAT bus
Internal power bus
East T1 bus
West T1 bus
Ref clock bus
E/W A&B sig bus
MCC bus
CHASSIS #2
120V
POWER
ENTRY
MODULE
AC INPUT
RING/BAT
INPUT
REAR
PLUG
SLOT
REAR
PLUG
SLOT
REAR
PLUG
SLOT
BUS
EXPANSION
CONN.
Fig. 5-11. Shelf Block Diagram.
71
T1 CHANNEL BANK
6. Hardware Configuration
This chapter provides reference information primarily intended for technical support personnel to show locations of the jumper headers and switch selections.
6.1 AC Power Supply
The AC power supply card set consists of the front plug power supply assembly and the rear plug power entry module. Block diagrams of the assemblies are illustrated in Figures 6-1 through
6-4 respectively.
65 or 115 watt switching power supply
+5 +12 -12 -5
-12
-5
+5
+12
Voltage
Indication
AC Power Supply
Diode
Coupling
AC Hot
24
Earth
20
AC Com.
22
GND
6
GND
4
+5v output
8
+12v output
10
-12v output
12
-5v output
14
Fig. 6-1. Block Diagram for the Front Plug Power Supply.
72
Front Plug Assembly
The front plug assembly is either a 65 watt or
115 watt switching power supply that will operate from a nominal input voltage of 120 VAC or
-48 VDC supplied through the rear plug assembly.
The assembly provides internal V and 12V DC outputs to the chassis plug-in modules via the midplane PWR bus. Four green LEDS are located on the faceplate, one for each output. When an LED is “on,” the corresponding output is in specification.
See Fig. 6-2 for assembly layout.
CHAPTER 6: Hardware Configuration
AC/DC Power 65 Watts LEDS are on when power is present
AC/DC Power 115 Watts
Fig. 6-2. AC and DC Power Supply Front Plug Assemblies.
73
T1 CHANNEL BANK
You can plug the power supply set into the
Channel Bank chassis or into the utility shelf. For example, the AC supply will be plugged into the standard 14 slot chassis for normal operation. For power redundancy, plug the AC supply into the utility shelf. For applications that have higher power requirements, use the larger power supply of 115 watts.
NOTE
If a DC power module is installed in the front, then a rear DC module is required. AC and DC power supplies
CANNOT be mixed in the same utility shelf.
6.2 AC Rear Plug Power Entry Module
See Fig. 6-3 for the assembly layout and Fig. 6-4 for the ground plan.
The rear entry module provides the interface connections for 120 VAC, ring generator, -48 V telephone signaling battery connections, and utility power. The 120 VAC connector is a standard IEC power-line connector on/off switch. The ring and -
48 V connector is a 4-connector male plug. The utility shelf connector is a 6-position female connector. The -48 V, ring and ground connections are inputs to the shelf. These signals are then available on the backplane for rear plug-in cards.
74
4 pin
6 pin
6 pin
Connection to ring
Gen. talk battery input
DC I/O +5, -5, +12V
-12V, GND,
FRAME GND
DC I/O +5V, GND
AC input
120 VAC
2A max
Fig. 6-3. AC Power Supply Rear Plug Assembly.
CHAPTER 6: Hardware Configuration
There are no header or option selections to configure on this card set, and there are no field-replaceable fuses.
There is an AC fuse on the power supply: 2 A,
250 V, AGC.
Mid
Plane
1 Ring
2 -48 V
3 BGND
4
5 AC Hot
6 AC Com
7 FGND
10 -5 V
11 -12 V
12 + V
13 +5 V
14 PWRGND
15 FGND
3 1
4 2
4 Pin
6 Pin
4
5
6
1
2
3
AC
Power
Bus
PWR GND
-48V BAT
Ring
900 OHMS
SB
Power
CKTS
Power
CKTS
Ring GND
BAT GND
PWR GND
FGND
Telephone
Interface
M E
SWI-N
E
Current
Detector
Generic Voice Interface
M
T
R
E
SG
Fig. 6-4. Ground Plan for the Rear-Plug Power-Entry Module.
75
T1 CHANNEL BANK
6.3 DC Rear Plug Power Entry Module
See Fig. 6-5 for the assembly layout and Fig. 6-4 for the ground plan.
The rear entry module provides the interface connections for an input ring generator, -48V telephone signaling battery connections, and utility power. The DC input terminal block connector is a standard IEC power line connector. The ring and -
48V connector is a 4-connector male plug. The utility shelf connector is a 6-position female connector. The -48V DC and ground connection is an input to the shelf.
There are no header or option selections.
+
FRAME
GND
-
DC INPUT
-48 VDC
4 pin
6 pin
6 pin
Connection to ring
Gen. talk battery input
DC I/O +5, -5, +12V
-12V, GND,
FRAME GND
DC I/O +5V, GND
Fig. 6-5. DC Power Supply Rear Plug Assembly.
76
6.4 T1 Logic Card (MT440C)
The T1 logic card performs the T1 multiplex/demultiplex functions, converting the T1 signals to
T1 internal bus signals. Individual channel cards or a second T1 common logic card can insert traffic into DS0 slots and read traffic from DS0 slots.
Fig. 6-6 is a block diagram of the T1 logic card.
The MCC uses the MCC communication bus to provide configuration data to the T1 logic card.
The T1 front-plug controller:
• Performs configuration selections
• Controls LEDs
• Reads front-panel switches
• Reads performance data
The rear plug assembly DSX-1 interfaces to a CSU
(using an internal CSU) or to the line directly. On the receive side, the rear plug extracts data and clock signals from the T1 line card and passes them to the front logic card for demultiplexing. On the transmit side, multiplexed data is framed and coded and passed to the rear plug. Then the line is coded into a DSX-1 pulse-shaping signal.
CHAPTER 6: Hardware Configuration
T1 Front Plug Assembly LEDs :
• Local Analog Loopback (LAL)
• On Line Status (ONL)
• Alarm (ALM)
• Red Alarm (RED)
• Yellow Alarm (YLW)
• Bipolar Violation (RBV)
Switches: LAL, ONL, ALM
Rear Plug Assembly (MT441C)
The rear-plug assembly is illustrated in Fig. 6-9.
This assembly provides a DSX-1 interface. The transmit compensation level can be selected for different cable lengths.
The T1 rear plug also provides:
• DSX-1 interface (optional)
• Internal CSU (optional)
• Control for redundant T1s
• Test-monitor jacks
77
78
T1 CHANNEL BANK
EAST/
WEST
SEL
EAST
WEST
A&B SIG
SYSTEM
BUS
INTER-
FACE
LOGIC
TX DATA
TX CK
FIFO
T1
FRAMER
TX
RX
SYS CK REC CLOCK
EAST
WEST
T1 CARD
CONTROLLER
WEST EAST
PHASE
LOCK-LOOP
LAL
ONL
ALM
RED
YEL
RBPV
INT
LOOP
LAL
ON LINE
ALM
EXT ALM
SWC CONTROL
LOOP BACK
CONFIGURATION
Fig. 6-6. Block Diagram for the T1 Logic Card.
There are no field-replaceable fuses on this card.
Verify header and switch selections.
See Fig. 6-7 and the following header information:
HD3 - Smart/dumb mode
1-2 Smart (factory)
2-3 Dumb
CHAPTER 6: Hardware Configuration
NOTE
The T1 ignores the loopback mode in alarm state. The T1 sends out a blue alarm when the unit is in loopback mode.
2117301-01
U7
HD3
1 3
2
T1
LAL
ONL
ALM
RED
YLW
RBV
LAL
ONL
ALM
Fig. 6-7. T1 Logic Card Front Plug Assembly.
79
T1 CHANNEL BANK
6.5 T1 Logic Card Switches
LAL: Depressing this switch puts the unit into local loopback or takes the unit out of loopback. The
LAL indicates the unit’s state.
ONL: Depressing this switch puts the unit on-line or off-line. The ONL LED indicates the unit’s state.
Use caution when you are in the redundant mode.
The T1 should be forced on-line through the NMS and not by using the on-line switch.
ALM: (Currently not used.)
6.6 DSX-1 Rear Plug Assembly
Fig. 6-8 is a block diagram for the rear plug assembly.
T1
Transceiver
+5V
+12V
Top
Tx Mon
Bottom
Rx Mon
9
3
1
2
4
11
To CSU
1
2
3
4
5
6
Control
Fig. 6-8. Block Diagram for the DSX-1 Rear Plug Assembly.
80
DSX-1 Rear Plug Assembly Connectors
CSU Connector (15-pin D sub)
• DSX1 interface
• 1 and 9 TX, 3 and 11 RX
Monitor Jacks (Bantam)
• XMT
• RCV
CHAPTER 6: Hardware Configuration
Control Connector (6 pin modular)
• Pin 1 is +5 VDC
• Pin 2 is +12 VDC
• Pins 3, 4 is ground
• Pins 5, 6 is switch control
There are no field-replaceable fuses on this card.
See Fig. 6-9.
There are no header or switch selections.
DSX1
STATUS
XMT
RCV
MONITOR
C
S
U
J1
CONTROL
Pin
9
10
11
12
13
14
15
7
8
5
6
3
4
1
2
CSU
Name
TX T1 T
NU
RX T1 T
NU
NU
NU
NU
NU
TX R1 R
NU
RX T1 R
NU
NU
NU
NU
Control
Direction Pins
Out A 1 +5
In A 2 +12
3 GND
Out B
In B
4 GND
5 SWC
6 SWC
STATUS INDICATOR
ON - Compatible plug-in is inserted into front slot.
OFF - No front plug-in inserted into front slot.
BLINKING - Incompatible front plug-in is inserted into the front slot.
Fig. 6-9. DSX1 Rear Plug Assembly.
81
T1 CHANNEL BANK
6.7 CSU (MT465C)
See Fig. 6-10 for a layout of the CSU card.
There are no field-replaceable fuses on this card.
There are no header, jumper, or switch selections.
STATUS INDICATOR
ON - Compatible plug-in is inserted into front slot.
OFF - No front plug-in inserted into front slot.
BLINKING - Incompatible front plug-in is inserted into the front slot.
J1
J3
CSU
STATUS
XMT
RCV
MONITOR
I
L
N
E
CONTROL
Fig. 6-10. CSU Rear Plug Assembly.
82
6.8 Quad PCM Voice Front Plug Assembly
(MT445C)
There are four voice-channel circuits on each card.
You can activate each voice circuit and assign it to any of the 24 time slots. The front card contains four CODEC functions and interfaces with the rear card over the front-to-rear links. Different rear cards can be mated with one front card. The front card is illustrated in Fig. 6-12. The rear cards are:
CHAPTER 6: Hardware Configuration
• 4-wire E&M providing Type I, II, and III signaling
• 2-wire station end: loop start or ground start,
FXS, PLAR
• 2-wire office end: loop or ground start, FXO
• 4-wire analog data
Power
Section
EEPROM
Smart
3
Dumb
1
2
Channel Card Controller
LB
TS
Sel Stat
LB
Control
Signal Selection
Configuration
Gain
LB
(PB)
CODEC
Logic
0
0
Clock
Active
Loopback
Control
Config.
Rx
Tx
East/
West
Sel
LB T1 bus
TS
Sel
Active Loopback
Channels 2, 3, 4
Clock
Gain
Rx
Tx
Fig. 6-11. Block Diagram for the Quad PCM Front Plug Assembly.
83
T1 CHANNEL BANK
The quad voice channel front plug assembly includes the following:
• 4 LEDs
• 4 Switches
• Loopback (1/ckt)
• Status (1/ckt)
- Active (on steady)
- Blinking (test mode)
- Off (T1 link down or not configured)
There are no field-replaceable fuses on this card.
Verify header and switch selections.
JP1:
1-2 Smart Mode (MCC controlled)
2-3 Dumb Mode
2
1 3
JP1
SMART/DUMB
SELECTION
1 2 3 Smart
1 2 3
Dumb
LED STATUS
INDICATORS
• ON - Channel not assigned to
DSO or in alarm.
• BLINKING -
Channel in loopback
LOOPBACK SWITCHES
• Activate channel loopback by depressing switch until status LED starts to blink.
• Deactivate channel loopback by depressing switch until status LED stops blinking.
• Disable during alarm condition.
Fig. 6-12. Quad PCM Voice Front Plug Assembly.
P
B
A
C
K
L
O
O
1
4
2
3
PCM
S
T
A
T
U
S
1
2
3
4
84
CHAPTER 6: Hardware Configuration
6.9 Quad 4-Wire E&M Rear Plug Assembly
(MT446C)
See Fig. 6-13 for the block diagram.
A & B signal logic
A & B
Set
A bit
Busy
A & B bits
B bit
A bit
B bit
Bat GND
48V Bat
5W
900
1 2
Common to circuits 1 to 4
HD1
Configuration and card type read logic
Switch 1-N closed
K
SWI = N
K
N = : Ch 1
N = : Ch 2
N = : Ch 3
N = : Ch 4
Current detect 1 E
7 EG
2 M
8 MB
3 T1
+7 TLP
6 R1
4 R
-16 TLP
Status
BG
Bat/
RNG
Digital
Analog
5 T
Fig. 6-13. Block Diagram for the 4-Wire E&M Rear Plug Assembly.
85
T1 CHANNEL BANK
CO or PBX trunk CO or PBX trunk
Type I Type I
±
48V
Current
Detector
-48V
E
E E
M
M Current
Detector
M
-48V
Type II E
Type II
Current
Detector
-48V
E
EG
E
M
M
Current
Detector
EG
M
-48V
MB
MB
R -48V
Tandem Mode Normal Mode
Fig. 6-14. Normal and Tandem E&M Signaling Configurations.
E
M
E
-48V
-48V
M
E&M Signaling Configurations
Mode
Normal
Normal
Normal
Normal
Tandem
Tandem
Tandem
Tandem
Type
II
II
I
I
II
II
I
I
Table 6-1. Signaling Configurations.
Receive input Transmit output
M at resistance battery
M at ground/open
M/MB loop is closed
M/MB loop is open
E at ground
E is open
E/EG loop is closed
E/EG loop is open
E at ground
E is open
E/EG loop is closed
E/EG loop is open
M at resistance battery
M at ground
M/MB loop is closed
M/MB loop is open
86
CHAPTER 6: Hardware Configuration
Off-hook Call Inititated
Interface
±
48VDC
M-lead driver
GND
E-lead
M-lead
GND
E-lead detector
M-lead detector
-48 VDC
M-lead detector
M-lead
GND
M-lead driver
E-lead
Offhook
GND
E-lead detector
Receive
Switching
System B
±
48VDC
Trunk Seizure
Interface
Send
E-lead
±
48VDC
M-lead driver
-48 VDC
M-lead
GND
GND
E-lead driver
Offhook
-48 VDC
M-lead detector
M-lead
Offhook
GND
E-lead
GND
E-lead driver
Send
Offhook
GND
E-lead detector
Receive
-48 VDC
Call Setup Completed
Interface
Send
-48 VDC
E-lead
±
48VDC
M-lead driver
-48 VDC
M-lead
E-lead driver
GND
Offhook
GND
-48 VDC
M-lead detector
M-lead
Offhook
GND
E-lead
GND
E-lead driver
GND
Offhook
E-lead detector
Receive
-48 VDC
Fig. 6-15. Calling Sequence for E&M Type I.
87
T1 CHANNEL BANK
Offhook
E-lead detector
±
48VDC
M-lead driver
Off-hook Call Inititated
Interface
E-lead driver
M-lead detector
GND
M-lead
M-lead detector
R
-48 VDC
MB
E-lead
EG
E-lead driver
Send
M-lead driver
Offhook
E-lead detector
GND
Receive
±
48VDC
88
Interface
Trunk Seizure
Interface
Receive Send
Offhook
E-lead detector
±
48VDC
M-lead driver GND
E-lead
E-G
M-lead
Send
Switching
System A
MB
Interface
Receive
M-lead detector
GND
R
-48 VDC
M-lead
GND
M-lead detector
R
-48 VDC
MB
E-lead
E-lead driver
Call Setup Completed
EG
Interface
M-lead driver
Offhook
E-lead detector
GND
Receive
±
48VDC
Send
Offhook
E-lead detector
±
48VDC
M-lead driver
GND
E-lead
E-G
M-lead
Send
Switching
System A
MB
M-lead detector
GND
-48 VDC
GND M-lead
M-lead detector
R MB
-48 VDC E-lead
EG
E-lead driver
M-lead driver
Offhook
E-lead detector
GND
Receive
±
48VDC
Fig. 6-16. Calling Sequence for E&M Type II.
Table 6-2. Circuit Signaling.
CHAPTER 6: Hardware Configuration
Trunk-to-signaling circuit
Type Lead
Signaling-to-trunk circuit
On-hook Off-hook Lead On-hook Off-hook
I
II
III
IV
M
M
M
M
GND
Open
GND
Open
BAT
BAT
BAT
GND
E
E
E
E
Open
Open
Open
Open
GND
GND
GND
GND
E&M Input
M-lead GND or open 0
M-lead battery or loop** *
*
*
Table 6-3. Normal Mode E&M Signaling States.
Transmit
A-bit B-bit
Receive
A-bit B-bit E&M output
0
1
*
*
*
*
0
1
*
*
*
*
E-Lead open
E-lead GND or loop**
Table 6-4. Tandem Mode E&M Signaling States.
Transmit
E&M Input to tandem A-bit B-bit
Receive
A-bit B-bit E&M output from tandem
E-lead open 0
E-lead GND or loop** 1
*
*
*
*
0
1
0
1
*
*
*
*
*
*
M-lead GND or open
M-lead battery or loop**
*Either 1 or 0
**Selectable option
89
T1 CHANNEL BANK
Verify Header and Switch selections.
- SW1
• ON Type I & III signaling
• OFF Type II signaling
- HD1 Factory Set
• 1-2, shorted. Do not change.
• 3-4, shorted
See Fig. 6-17 for a description of the switches, jumpers, and the headers that you need to configure. See Figures 6-18 through 6-20 for block diagrams for Types I, II and III signaling.
FACTORY SET
1 - 2
3 - 4
1
3
2
4
DO NOT CHANGE
HD1
1
3
2
4
SW1
1 2 3 4
4W
E&M
STATUS
CH 1
CH 2
CH 3
CH 4
SWITCH SW1 SELECTION
ON - GND on pin 7 (SG) for
Type I and III signaling.
OFF - Form a contact between pins 1 (E) and 7 (SG) for
Type II signaling.
Positions:
1 - CKT #1
2 - CKT #2
3 - CKT #3
4 - CKT #4
STATUS INDICATOR
ON - Compatible plug-in is inserted into front slot.
OFF - No front plug-in.
BLINKING -
Non-compatible plug-in is inserted into front slot.
Fig. 6-17. Quad 4-Wire E&M Rear Plug Assenbly.
90
CHAPTER 6: Hardware Configuration
A & B signal logic
A & B
Set
A bit
Busy
A & B bits
B bit
A bit
B bit
Bat GND
48V Bat
5W
900
1 2
Common to circuits 1 to 4
HD1
Configuration and card type read logic
K
SWI = N
K
N = : Ch 1
N = : Ch 2
N = : Ch 3
N = : Ch 4
Current detect
+7 TLP
-16 TLP
Status
BG
Bat/
RNG
Digital
Analog
5 T
1 E
7 EG
2 M
8 MB
3 T1
Switch 1-N closed
Common battery and ground through midplane
K
-48V
-48V
BG
6 R1
4 R
Fig. 6-18. Type I Signaling.
91
92
T1 CHANNEL BANK
A & B signal logic
A & B
Set
A bit
Busy
A & B bits
B bit
A bit
B bit
Bat GND
48V Bat
5W
900
1 2
Common to circuits 1 to 4
HD1
Configuration and card type read logic
K
SWI = N
K
N = : Ch 1
N = : Ch 2
N = : Ch 3
N = : Ch 4
Current detect
+7 TLP
6 R1
4 R
-16 TLP
Status
BG
Bat/
RNG
Digital
Analog
5 T
1 E
7 EG
2 M
8 MB
3 T1
Switch 1-N closed
Common battery and ground through midplane
K
-48V
BG
Fig. 6-19. Type II Signaling.
CHAPTER 6: Hardware Configuration
A & B signal logic
A & B
Set
A bit
Busy
A & B bits
B bit
A bit
B bit
Bat GND
48V Bat
5W
900
1 2
Common to circuits 1 to 4
HD1
Configuration and card type read logic
K
SWI = N
K
N = : Ch 1
N = : Ch 2
N = : Ch 3
N = : Ch 4
Current detect
+7 TLP
6 R1
4 R
-16 TLP
Status
BG
Bat/
RNG
Digital
Analog
5 T
1 E
7 EG
2 M
8 MB
3 T1
Switch 1-N closed
Common battery and ground through midplane
K
1K -48V
Fig. 6-20. Type III Signaling.
93
T1 CHANNEL BANK
6.10 Quad 2-Wire FXS Rear Plug Assembly
(MT447C)
Fig. 6-21 is a block diagram for the FXS rear plug assembly.
A & B signal logic
A & B
SEL
A & B bits
A bit
B bit
A bit
B bit
Signal
Converter
Tip connect
Ring
T
R
Off hook
Ringback tone module
(Daughter board
48V Battery
Tone progress signal
R
Ring
Voltage
Power Bal net
Hybrid logic
Incoming call
Ring
GND
Ans
Ring tip and loop/GND start det logic
Ring Voltage
R
150
Current detect
Current detect
150
R
150
3
+3dB
R
T
4
T
-9dB
R
Battery GND
Configuration and card read logic
Active
Note: BAT GND
& PWR GND tied together on RPA
Fig. 6-21. Block Diagram for the 2-Wire FXS Rear Plug Assembly.
94
CHAPTER 6: Hardware Configuration
See the table in Fig. 6-22 to locate the switch selections you need.
Tone module daughter card
SW1
5
1
Loop/Ground Start Selection
SW1 SW2 SW3
Off Off Off Loop startstandard
Ground startstandard
Loop startconversion
Loop startconversion
Loop start-auto matic ring down
Ground start-auto matic ring down
On
Off
On
Off
On
Off
On
On
Off
Off
Off
Off
Off
On
On
STATUS INDICATOR
ON - Compatible plug-in is inserted into front slot.
OFF - No front plug-in.
BLINKING -
Non-compatible plug-in is inserted into front slot.
2W
FXS
STATUS
CH 1
CH 2
CH 3
CH 4
Fig. 6-22. 2-Wire Station End (FXS) Rear Plug Assembly.
95
T1 CHANNEL BANK
WARNING
If you remove the front QPCM card from a rear FXS card, noise will be generated on ALL channels signaling time slots. To avoid this noise, follow this guideline: remove the rear card first. Then remove the front card.
To insert an FXS card, observe the reverse process
—install the QPCM card first. Then push in the
FXS rear card because the signaling intelligence is on the rear card of an FXS set. Without having a front card installed first, the leads will float and will cause noise.
STATUS INDICATOR
ON - Compatible plug-in is inserted into front slot.
OFF - No front plug-in.
BLINKING - Non-compatible plug-in is inserted into front slot.
4W
AD
STATUS
CH 1
CH 2
CH 3
CH 4
96
Fig. 6-23. Block Diagram for the 2-Wire Office End (FXO) Rear Plug Assembly.
CHAPTER 6: Hardware Configuration
6.11 Quad 2-Wire FXO Rear Plug Assembly
(MT448C)
There are no field-replaceable fuses on this card.
Verify Header and Switch selections. See
Fig. 6-24 to locate these headers and switches.
- SW 1 Not used, factory set to all ON
- HD1 through HD4
• 1-2 900 ohms
• 2-3 600 ohms
HD5 and HD6
• 1-2 Ground start mode
• 2-3 Loop start mode
Make busy selection:
When mux is in alarm (red or yellow), this selects how interface is made busy.
HD1
1 3
HD1
1 3
1-2 on alarm interface puts GND on ring for GND start lines.
2-3 on alarm interface closes contact A between pins 1 & 6
(ext wiring for loopstart lines)
HD6 1 3
HD1
1 3
HD2
1 3
HD3
1 3
HD5
1 3
HD4
1 3
Loop/Ground
Start Selection
HD5 and
HD6 1 3
Ground start 1-2
HD5 and
HD6 1 3
Loop start
2-3
2W
FXO
STATUS
CH 1
CH 2
CH 3
CH 4
900/600
Ohm term
HDN
1 3
HDN
1 3
900 Ohms
600 Ohms
HD1 - Line 1
HD2 - Line 2
HD3 - Line 3
HD4 - Line 4
STATUS INDICATOR
ON - Compatible plug-in is inserted into front slot.
OFF - No front plug-in.
BLINKING -
Non-compatible plug-in is inserted into front slot.
Fig. 6-24. Quad 2-Wire FXO Rear Plug Assembly.
97
T1 CHANNEL BANK
6.12 Quad 4-Wire Analog Data (AD) Assembly
(MT418C)
See Fig. 6-25 for an illustration of this assembly. The
AD assembly provides a transmission level of +13
TLP (transmission level point) on the transmit pair and -3 TLP on the receive pair. You use this assembly to interface analog modems for voiceband transmission over a T1 circuit. Modem levels are 13dB or 15dB below the transmission level point. Which level is used depends on what common carrier network the VF circuit interconnects. Use the following guideline in Table 6-5 to set the analog settings:
Table 6-5. 4-Wire Analog Level Setting.
Common Carrier Network
-5 dBmo networks*
TX (+13TLP)
-2dBm
RX (-3TLP)
-18dBm
-13 dBmo networks*
Pt-Pt Application**
0dBm
0dBm
-16dBm
-16dBm
*Network access applications where only one T1 Channel Bank multiplexer is used to access a nationwide common carrier network.
**Pt-Pt uses T1 Channel Bank multiplexers on both ends of a T1 circuit.
98
CHAPTER 6: Hardware Configuration
4W
AD
STATUS
CH 1
CH 2
CH 3
CH 4
STATUS INDICATOR
ON - Compatible plug-in is inserted into front slot.
OFF - No front plug-in.
BLINKING - Non-compatible plug-in is inserted into front slot.
Fig. 6-25. Layout of the 4-Wire Analog Data Rear Plug Assembly.
There are no field-replaceable fuses on this card.
HD1 jumper selects the time-out on the loopback circuit. Setting HD1 to 1 and 2 selects 20 minutes of loopback, and then the loopback will terminate.
Setting HD1 to 2 and 3 selects 4 minutes of loopback (the factory default).
HD2 jumper selects the frequency to initiate the loopback command. Setting HD2 to 1 and 2 selects
2813Hz (the factory default) as the loopback frequency. Setting HD2 to 2 and 3 selects 2713Hz as the loopback frequency.
Fig. 6-26 is a block diagram for the quad 4-wire analog data (AD).
99
T1 CHANNEL BANK
Typical modem levels
TLP
Modem levels
+13 -3
0 -16
CONFIGURATION AND
CARD TYPE READ LOGIC
Status
-3 TLP
+13 TLP
BG
Bat/
RNG
5
6
4
2
8
3
1
7
-16 db
0 db
Fig. 6-26. Block Diagram for the 4-Wire Analog Data Rear Plug Assembly.
6.13 High Speed Data Card (Single) (MT450C)
Front Plug Assembly
Fig. 6-27 is a block diagram for the high-speed data plug assembly.
100
CHAPTER 6: Hardware Configuration
EAST/
WEST
SEL
EEPROM
1
2
3
HD 3
Power
Section
LB
Channel Card Controller
TS
SFI STAT
Test Mode
LB
(PB)
Loopback
Configuration
INT/EXT Sel.
Conf.
MUX/
DEMUX
REC FIFO
Port Clock
TX FIFO
RD
RC
Loopback
INT
EXT
TC
ETC
TD
Signal
Fig. 6-27. Block Diagram for the High-Speed Data Front Plug Assembly.
The key logic on the data card is the FIFO buffers, which bridge the time burst of 1.544-Mbps T1 internal bus signals into continuous clock and data signals at the channel interface. This card can receive and insert up to 24 time slots to provide a
1,536 Kbps data rate. You can insert data in seven
(7) bits out of the available 8 of a DS0 for a root rate of 56 Kbps, or you can use all 8 bits for a root rate of 64 Kbps. When you select N x 56 mode, bit eight is always a “1”. When you select N x 64, the T1 line must be configured with B8ZS, and the network services must be capable of clear channel operation.
Thus the data card can be configured to operate in steps of 56 or 64 Kbps up to 1344 or 1536 Kbps.
Front Plug Assembly Selections
This has N x 56/64 capability. There are no fieldreplaceable fuses on this card. Verify header and switch selections. See Fig. 6-28 for jumper positions and header and switch selections. The T1 highspeed data card has LEDs that show the status as either active (on steady) or loopback (blinking).
The switches on this card are loopback (LDL).
- HD2 - Factory Test Header must be set to position
2-3.
- HD3 - Factory Set Header must be set to 2-3.
101
T1 CHANNEL BANK
1
2
3
HD2
HD3
1 2 3
FACTORY SET HEADERS: 2-3
LED status indicators:
ON - active channel
OFF - channel not assigned to
DSO or in alarm
BLINKING - channel in loopback
LOOPBACK SWITCH:
• Activate channel loopback by depressing switch until status LED starts to blink.
• Deactivate channel loop by depressing switch until status LED stops blinking.
• Disable during alarm condition.
Fig. 6-28. High Speed Data Front Plug Assembly.
6.14 Dual Data Card (MT470C)
Front Plug Assembly
The dual data card (DDC) front plug assembly contains two 56/64 Kbps digital data channels. The
DDC is designed to mate with OCU (office channel unit card) and dual digital (V.35/RS-422/RS-232) rear interface assemblies. The DDC supports the following:
• AT&T standard non-latching network loopback codes
• MCC network management loopback controls
• Manual front-panel pushbutton loopback activation
Fig. 6-29 shows a block diagram of the DDC. Only one circuit is illustrated to simplify the diagram.
The DDC card is a 56/64 Kbps channel card. The key logic on the DDC is the rate converter buffer that changes the channel’s continuous data into a time burst T1 DS0 signal. Through the MCC configuration menu the two channels can be assigned to either the East or West T1. The MCC also permits each channel to be assigned to any one of 24 DS0 time slots.
102
The receive-rate converter operates from the system port clock, which is synchronized to the East
T1 timing. This RC clock is the clock that interfaces to the rear plug assembly. The transmit-rate converter clocks transmit data either by selecting the port clock (internal mode) or an external clock
(external mode). This selection is made through the MCC configuration menu. When external clock is used, the device connected to the channel interface must be in loop timing or synchronized to the East T1 circuit.
A local digital loopback (LDL) circuit provides a loopback in both the T1 and channel interface direction. This loopback is activated by the frontpanel pushbutton switch or via the MCC networkmanagement system when mated with all types of rear plug-in cards.
CHAPTER 6: Hardware Configuration
• When the dual data interface card is mated with the DDC, the AT&T network nonlatching loopback codes (OCU, CSU, DSU) detected in the DS0 will also activate the LDL loopback.
• When an OCU-DP is mated with the DDC, the non-latching network loopback codes are passed on to the rear OCU-DP card to individually affect their respective OCU, CSU, and DSU loopback functions.
103
T1 CHANNEL BANK
1 3
Controller
PB SWC 1/3
PB SWC 2/4
CSU loopback
OCU loopback
OLP
DSU loopback
Control mode
Rec sig det
Int/ext (BUF) detect
LDL LP
LED 1/3
LED 2/4
OCU code
CSU code
DSU code
CMI code
Code detect
RD
RC
East/West
T1 select
MUX deMUX logic
Rec rate convert
Port clock
Transmit rate conversion
TC
EXT
TD
To rear plug
Fig. 6-29. Dual Data Card Front Plug Assembly.
104
CHAPTER 6: Hardware Configuration
Modes of Operation
See Fig. 6-30 for the layout of the DDC card.
HD3
1 2 3
CPU
SW1
SW2
DDC
Fig. 6-30. High-Speed Dual Data Card Front Plug Assembly, the DDC.
105
T1 CHANNEL BANK
MCC Options
The DDC supports 56, 64, and switched 56 Kbps and SW56 E&M service. These modes are selected through the MCC network management system.
How these modes are used and their application will depend on what rear plug assembly is mated with the DDC. See Table 6-6 for a description of modes.
Table 6-6. MCC Modes
MCC Selection
56
64
SW 56
SW 56 E&M
DSU-DP
56 Kbps
64 Kbps
56 Kbps*
56 Kbps*
OCU-DP
56 line rate
72 Kbps line rate
56 line rate* (US West)
Other carrier
*In the SW 56 mode, the receive A signaling bit is used to put the rear interface into control mode idle or data mode. If the A signaling bit is 0, it is in control mode idle. If the bit is a 1, then it is in data mode.
LED Switches and Loopback Controls
Table 6-7. LEDs When Mated with a DSU-DP.
CHAN 1 CHAN 2 LED Status
LED 1
LED 3
LED 2
LED 4
OFF—channel not assigned
ON—channel assigned to DS0
FLASHING—When MCC or push button activated loopback
OFF—not used
ON—not used
FLASHING—When network loopback control codes are received in the DS0.
106
CHAN 1
LED 1
LED 3
CHAPTER 6: Hardware Configuration
Table 6-8. LEDs When Mated with an OCU-DP
CHAN 2
LED 2
LED 4
LED Status
OFF—channel not assigned
ON—channel assigned to DS0
FLASHING—When MCC or pushbutton activates loopback.
OFF—no receive line signal is being detected on the OCU-DP 4-wire line. This indicates a carrier fail condition from the
56 Kbps DSU/CSU connected to the
OCU-DP.
ON—Line signal is being detected from the
56 Kbps DSU/CSU.
FLASHING—When network loopback control codes are received in the DS0 or
MCC activates loopback.
Front-Panel Switches
The front-panel switch puts the DDC card into and out of Local Digital Loopback (LDL). This provides a loopback to both the DS0 and the channel interface. This is indicated by flashing LEDs 1 and 2 for channels 1 and 2 respectively.
Loopbacks
Three separate control elements can generate loopback actions:
• Manual front-panel pushbutton
• MCC control
• Receiving network DS0 non-latching loopback control codes (OCU, CSU, DSU)
What type of loopback action will result when a control element activates a loopback will depend on the type of matching rear card.
A brief description of the cards and loopback capability follows.
OCU-DP (MT476C)
The OCU-DP rear card has the following loopback logic circuits:
• QLB: This provides a loopback to the DSU/CSU and can be activated by the MCC without the channels being assigned to a DS0. This loopback is used to verify the OCU-DP, Cabling and the 56
Kbps DSU/CSU.
• OCU: This provides a bipolar loopback of the
DDS signal to the T1 DS0.
• CSU: This causes the OCU-DP to reverse sealing current which will put a CSU/DSU into CSU loopback. (This requires 48V power supply connected to rear power module.)
• DSU: This causes the OCU-DP to transmit a control code to put CSU/DSU into a DSU loopback.
107
T1 CHANNEL BANK
Control of Loopbacks
Tables 6-9 and 6-10 illustrate each control element and which loopback it controls for both the DSU-
DP and OCU-DP rear interface cards.
Table 6-9. Loopback Control with DSU-DP.
Control
Manual PB
MCC Control
OCU
CSU
DSU
OCU
CSU
DSU
Description Loopback
Manual/local
VT100 modem
LDL
LDL
LDL
LDL
LDL
Network Codes RX in DS0
LDL
LDL
LDL
Device tested
DDC
DDC
DDC
DDC
DDC
DDC
DDC
DDC
Table 6-10. Loopback Control with OCU-DP.
Control
Manual PB
MCC control*
LDL
QLB
OCU
CSU
DSU
OCU
CSU
DSU
Description Loopback
Manual/local
VT-100/modem
LDL
LDL
OLB
OCU
CSU
DSU
Network Codes RX in DS0
OCU
CSU
DSU
Device tested
DDC
DDC
OCU-DP
OCU-DP
DSU/CSU
DSU/CSU
OCU-DP
DSU/DSU
DSU/CSU
*Full MCC control is via the DDC monitor/test menu. The loopback menu that displays the time slots will only control the LDL loopback.
108
6.15 Dual Data Card (DSU-DP) Rear Interface
There are no field-replaceable fuses on these cards.
See Fig. 6-31. The rear plug assembly uses the V.35,
RS-232 , and RS-530 cards (MT471C, MT473C, and
MT472C).
See Fig. 6-33 through 6-35 for block diagrams of the three rear plug assemblies. See Tables 4-16 through
4-18 that show the connector pinouts for these interfaces.
CHAPTER 6: Hardware Configuration
HD1 and HD3
• 1-2 Frame ground
• 2-3 Frame ground through 100 ohms resistor
• 3-4 Floating (factory)
-HD2 and HD4
• 1-2 Signal ground (factory)
• 2-3 Signal found through 100-ohm resistor
• 3-4 Floating
HD1
1 2 3 4
HD2
1 2 3 4
HD3
1 2 3 4
HD4
1 2 3 4
DSU-DP
V.35
STATUS
CH. 1
CH. 2
Fig. 6-31. Dual Data Card (DSU-DP) Assembly, Showing the V.35 Card.
109
T1 CHANNEL BANK
The RS-232 card is the same as shown in Fig. 6-31 except that the part number of the RS-232 card is
MT473C. The RS-530 part number is MT472C.
6.16 Subrate Dual Data Card
The subrate dual data card (SDDC) front plug assembly contains two 9.6 Kbps digital data channels. See Fig. 6-32. The SDDC is designed to drive the OCU rear card along with the DDC.
HD1
• 1-2 Factory
• 2-3 Ground PD7
CPU
SW1
SW2
HD1
3 1
S
T
A
T
U
S
DDC
3
4
1
2
Fig. 6-32. Subrate Dual Data Card Front Plug Assembly.
110
6.17 High-Speed Data Card Rear Plug Assemblies
There are no field-replaceable fuses on this card.
See Fig. 6-33. The rear plug assembly (single) uses the V.35, EIA 530 and RS-232 cards. (MT451C,
MT452C, MT453C) See Figures 6-34 through
6-36 for block diagrams of the three rear plug assemblies. See Tables 4-3 through 4-11 for interfaces showing connector pinouts. The LEDs have active status.
CHAPTER 6: Hardware Configuration
RS-232 Card
• JP1—1 and 2—the DSR is normal.
• JP1—2 and 3—the DSR is tied high.
• JP2—1 and 2—the chassis and signal grounds.
The interface is jumpered to frame ground via
100-ohm resistor.
• JP2—2 and 3—the chassis and signal grounds are tied directly to frame ground.
• JP2—3 and 4—the chassis and signal grounds float, and the interface is not tied to frame ground.
V.35
STATUS
RS-530
STATUS
DCE
DCE
JP1
1 2 3
JP2
1
3 2 1
Fig. 6-33. High Speed Data Rear Plug Assembly (single).
DCE RS-530
RS-232
111
112
T1 CHANNEL BANK
NOTE
The block diagrams for the dual high speed data interface cards—V.35, RS-
530, RS-232—are the same as the single RPAs.
RS-530
DCE
PWR
SEC
PWR
REC DATA
REC CLOCK
TRANS CLOCK
EXT TRANS CLOCK
TRANS DATA
DCD
DTR
DSR
RTS
CTS
CONFIGURATION AND
CARD TYPE READ LOGIC
STATUS
EXT BAT GND
REC DATA
REC CLOCK
TRANS CK
EXT TX CKS
3
16
17
9
12
16
11
24 e c t o r c o n n
25 pin
TRANS DATA
14
2
DCD
DTR
10
8
23
20
DSR
RTS
22
6
19
4
CTS
13
5
Fig. 6-34. Data Card Rear Plug Assembly, 25-pin (RS-530, single).
CHAPTER 6: Hardware Configuration
RS-232
DCE
PWR
SEC
PWR
REC DATA
REC CLOCK
TRANS CLOCK
EXT TRANS CLOCK
TRANS DATA
DCD
DTR
CONFIGURATION AND
CARD TYPE READ LOGIC
STATUS
EXT BAT GND
REC DATA
3
REC CLOCK
TRANS CK
EXT TX CK
17
15
24 e c t o r c o n n
25 pin
TRANS DATA
2
DCD
DTR
8
20
DSR
6
DTRT
4
CTS
5
Fig. 6-35. Data Card Rear Plug Assembly, 25-pin (RS-232, single).
113
T1 CHANNEL BANK
V.35
DCE
PWR
SEC
PWR
REC DATA
REC CLOCK
TRANS CLOCK
EXT TRANS CLOCK
TRANS DATA
DCD
DTR
CONFIGURATION AND
CARD TYPE READ LOGIC
STATUS
EXT BAT GND
REC DATA
REC CLOCK
TRANS CK
EXT TX CK
R
T
34
V
X
AA
Y
W
U pin e c t o r c o n n
TRANS DATA
S
P
CTS
D
RTS
C
DSR
E
DTR
H
DCD
F
114
Fig. 6-36. Data Card Rear Plug Assembly, 34-pin (V.35 single).
6.18 Office Channel Unit Data Port
Rear Plug Assembly (MT476C)
The 4-wire OCU-DP rear plug assembly houses two
OCU-DP interfaces on one RPA. It is designed to mate with a dual data card (DDC) or SDDC (9.6) front plug assembly. The OCU-DP RPA supports
56 Kbps and 72 Kbps 4-wire line rates. Fig. 6-37 is a block diagram of the OCU-DP. The OCU-DP is broken into subsections:
• Transceiver
• CSU loopback
• Sealing current
• Line coupling
CSU loopback
OCU loopback
OLB
DSU loopback
Control mode
CMI CMI
BAT
GND
CHAPTER 6: Hardware Configuration
RD
RC
NRZ-
AMI
Coder
REC SIG DET
EXT CK
TD
Bi-polar transmitter
Bi-polar receiver
Fig. 6-37. Block Diagram for the OCU-DP Rear Plug Assembly.
T
1
R
2
CH 1 & 2
R1
7
T1
8
115
T1 CHANNEL BANK
The transceiver section interfaces NRZ signals from the front plug assembly DDC into a baseband, bipolar, return to zero 4-wire signal. This signal is referred to as line signal. The transceiver operates at a 56-Kbps line-signal rate or 72-Kbps line-signal rate.
Fig. 6-38 is a physical layout of the OCU-DP RPA.
Header straps located on the board (HD1 and
HD2) are used for channels 1 and 2 respectively and enable or disable the sealing current (OCU loopback) on the 4-wire interface. The two channels are available on a single modular connector mounted on the RPA.
1
2
3
HD 1
OCU-DP
STATUS
1
2
3
HD 2
Fig. 6-38. Office Channel Unit Data Port Interface Card.
116
In the 56-Kbps line-signal mode, the format is bipolar employing violation signaling as described in AT&T Publication 62310. In the 72-Kbps linesignal mode, the format is a 72 Kbps multiplexed signal formatted in 9-bit bytes, containing 7 primary channel data (D) bits, a framing (F) bit, and a shared bit (C/S), according to AT&T Publication
54075. The seven primary channel data (D) bits are mapped into bits 1-7 of a DS0, the C/S bit is mapped into bit 8 of a DS0, and the frame bit is used by the OCU-DP to synchronize the 72 Kbps frame to a DS0 byte. Equipment using this line rate must conform to Publication 54075 and ensure that
D bits and C bits never equal all zeros, or it must be engineered on a B8ZS network.
The transceiver is put into the 56-Kbps line-rate mode via the MCC. When you select 56 K or SW-A
56K modes, the transceiver is in the 56-Kbps linesignal rate mode. When 64 Kbps is selected, the transceiver is in the 72 Kbps mode.
In the SW-A 56 mode, the receive A signaling bit is used to put the rear interface into control mode idle or data mode. If the A signaling bit is a 0, it is in control mode idle. If the bit is a 1, then it is in data mode.
The transceiver also provides a QLB loopback.
This loopback is activated via the MCC system and provides a digital loopback to the 4-wire line. This allows a DSU/CSU, cable pairs and OCU-DP card to be tested independently from the T1 network.
An OCU-DP/DDC card set does not have to be assigned a DS0 channel to activate this loopback.
For 56 Kbps and SW-A 56 the line rate is
56 Kbps. The network control codes received in the
DS0 are converted to bipolar violation code rules on the 4-wire output line. In reverse, bipolar violation code rules on the input line are converted to network control codes in the DS0.
For 64K mode, the line rate is 72 Kbps. The network control codes received in the DS0 are mapped into 8 of the 9 bits of the formatted byte.
In reverse, network control codes are generated by the end device and interleaved in bits 1-8 of the transmit DS0.
CHAPTER 6: Hardware Configuration
The OCU-loopback logic provides a loopback to the DS0. This is activated by receiving a network
OCU loopback control code or via the MCC.
Sealing current is provided on the 4-wire line and is reversed if a CSU loopback is activated. This is activated by receiving a network CSU loopback control code or via the MCC. (This requires a -48V power supply connected to the rear power entry module or backplane connector.)
The 4-wire line is transformer-coupled with a center tap access for sealing current. The linecoding signal is not sensitive to T and R polarity.
Modes of Operation
Channel 1
- HD-1 1-2 sealing current enabled
2-3 sealing current disabled
Channel 2
- HD-2 1-2 sealing current enabled
2-3 sealing current disabled
The OCU-DP rear card has the following loopback logic circuits:
• QLB: This provides a loopback to the DSU/CSU and can be activated by the MCC without the channels being assigned to A DS0. This loopback is used to verify the OCU-DP, cabling and the 56 Kbps DSU/CSU.
• OCU: This provides a loopback to the T1 DS0.
• CSU: This causes the OCU-DP to reverse sealing current which will put a CSU/DSU into CSU loopback. (This requires a -48V external power supply.)
• DSU: This causes the OCU-DP to transmit a control code to put CSU/DSU into a DSU loopback.
117
T1 CHANNEL BANK
Control
Manual PB
MCC Control
LDL
QLB
OCU
CSU
DSU
OCU
CSU
DSU
Table 6-11. OCU-DP Logic Circuits
Description
Manual/local
VT100 modem
Loopback
LDL
LDL
OLB
OCU
CSU
DSU
Network Codes RX in DS0
OCU
CSU
DSU
Where
DDC
DDC
OCU-DP
OCU-DP
DSU/CSU
DSU/CSU
OCU-DP
DSU-DSU
DSU/CSU
118
6.19 MCC Unit
MCC Front Plug Assembly (MT442C)
The MCC front plug assembly is a microcontroller with three serial I/O ports to permit communications with a system operator and the various hardware elements of the system. The microcontroller operates the VT100 or VT52 menus, holds the shelf configuration, and communicates with shelf plug-in cards. Fig. 6-39 shows the MCC front plug assembly, and Fig. 6-41 shows the block diagram.
CHAPTER 6: Hardware Configuration
The three serial I/O ports provide:
• Communication port to the VT100 or VT52 terminal
• Communication port for modem
• MCC NET Series 6000 support
There are no field-replaceable fuses on this card.
Verify Header and Switch selections. See
Fig. 6-39 and Table 6-12 for these configurations.
Table 6-12. MCC Switch 1 Selections.
0
1
0
1
4
0
1
1
1
0
0
5
1
1
1
1
1
1
6
0
0
MCC baud rate
600
1200
2400
4800
9600 (factory set)
19200
119
T1 CHANNEL BANK
1 3
JP1
2
S1
S2
U18
U20
SCN
XMT
RCV
WD
Reset
Fig. 6-39. MCC Front Plug Assembly.
Table 6-13. Switch Bank 2 Selections (version 3.3.3 or higher) (All switches are off for factory default).
Switch bank 2
Switch 1
Switch 2
Switch 3
Switch 4
Switch 5
Switch 6
Switch 7
Switch 8
On
Expansion shelf
MCC dominant
Penril test
Soft-configured
VT52
Off (default)
Standard
Channel card Dominant
Normal
Smart mode
VT100
Default, not used
Default, not used
Default, not used
120
CHAPTER 6: Hardware Configuration
Switch 1—If you need to add an expansion shelf to your 14-slot chassis, this switch should be on.
Switch 2—With this switch on, the MCC configuration is dominant. If the switch is off, the channel cards are dominant.
Switch 4—With switch 4 on, channel cards can be configured with an MCC card, and then you can remove the MCC. If power is lost, the configuration remains.
Switch 5—With switch 5 on, you can use a
VT52 terminal.
Configurable Channel Bank
‘X’ active MAIN MENU
Node Name: D&I
1—System functions
2—Loopback Menu
3—Digital Milliwatt Menu
4—Monitor Test/Plugins
5—Configure Plugins
6—Force configuration change
7—Clone configurations A -> (B,X,V)
8—Set Configured Channel Bank Mode
Select function:
ESC—Login Screen
06:29:50
Fig. 6-40. Configurable Channel Bank Mode Option.
Once you have switch bank 2 switch 4 on, you can configure the channel bank using the MCC. Once it is configured, you can remove the MCC card. The configuration will remain the same even if power is lost. Select 8 from the Main menu to use this option to configure the T1 Channel Bank to operate in the
A configuration without an MCC card installed. See
Fig. 6-40 .
121
T1 CHANNEL BANK
MCC Rear Plug Assembly (MT443C)
Fig. 6-42 is a block diagram for the MCC rear plug assembly.
See Fig. 6-43 for the assembly layout.
The rear plug assembly contains three I/O ports:
• P1 is a DCE port that is used to connect to a
VT100 or VT52 DTE port.
• P2 is a DTE port that is used to directly connect to a DCE modem type port.
• J2 supports MCC NET.
The current MCC software supports P1 & P2 as a single I/O with both ports enabled. P1 would be used for connections to DTE and P2 for connections to DCE (modem).
There are no field replaceable fuses on this card.
There are no header or switch selections.
Reset MCC
PB-1
Microprocess
Data link port
Memory
MCC
Bus
I/O
Terminal port
1
3
FACTORY SET
2
JP1
1
3
2
JP2
Not used
PB-2
Config.
on off
1
2
5
6
3
4
7
8
Terminal port on off
1
2
5
6
3
4
7
8
SW2
Not used
Network port
I/O
To
RPA
Poll shelf
Rx net
Tx net
Not used
Not used
JP3
Factory set
To
RPA
Fig. 6-41. Block Diagram for the MCC Front Plug Assembly.
122
TERM
PORT
SELECT DCE PORT
DATA OUT
DATA IN
READ DCE ( DEC )
READ RTS ( DCE )
CTS ( DCE )
SELECT DTE PORT
READ DCD ( DTE )
READ DSR ( DTE )
NET
PORT
Data IN
Data OUT
CHAPTER 6: Hardware Configuration
RXD
TXD
DTR
DSR
RTS
CTS
DCD
RXD
TXD
DTR
DSR
1
2
3
4
5
8
9
6
7
DCE
6
4
5
8
3
2
20
7
4
5
1
2
3
6
7
8
9
DTE
6
4
5
8
3
2
20
7
7
8
5
6
3
4
1
2
MCC
NET
Fig. 6-42. Block Diagram for the MCC Rear Plug Assembly.
123
T1 CHANNEL BANK
CPU
Fig. 6-43. MCC Rear Plug Assembly.
D
T
E
D
C
E
MCC
STATUS
MCC NET
124
6.20 Dual Modem Card
DMC Front Plug Assembly (MT482C)
Fig. 6-44 shows the front plug assembly and Fig. 6-
45 shows the block diagram.
There are no header selections. There are no field-replaceable fuses on this card.
Switch 1—This is for a channel 2 loopback.
Switch 2—The channel 1 loopback is a bidirectional loopback that loops the data back to the network and also to the modem.
CHAPTER 6: Hardware Configuration
SW1
SW2
B
A
C
K
DMC
L
O
O
P
ONL 1
NM 2
ONL 3
NM 4
1
2
Fig. 6-44. Dual Modem Card Front Plug Assembly.
125
T1 CHANNEL BANK
320C51
RAN. RON
FLASH
DSP 320C51
TADDRESS
TDATA (0-15)
TCONTROL
CHANNEL 1
320C51
RAN. RON
FLASH
CHANNEL 2
DSP 320C51
TADDRESS
TDATA (0-15)
TCONTROL
TADDRESS
TDATA (0-15)
TCONTROL
ASIC
NADDRESS
NDATA
NCONTROL
320C51 TO 68302
MAILBOX
NAFE
NAFE
TADDRESS
TDATA (0-15)
ASIC
TCONTROL
NADDRESS
NDATA
NCONTROL
320C51 TO 68302
MAILBOX
68302
RAN. RON
FLASH
PCN CODEC
ANALOG TO
DIGITAL
DIGITAL
TO ANALOG
PCN CODEC
ANALOG TO
DIGITAL
DIGITAL
TO ANALOG
68302
RAN. RON
FLASH
DATA I/O
DATA I/O
68302 PROCESSOR
NADDRESS
NDATA (0-15)
UART1
UART2
NCONTROL NUART3
3/WIRE
SERIAL EE
XILINX
TIME SLOT
A/B SIGNALING
PLL DIVIDERS
PLL DIVIDERS
SERIAL EE
68302 PROCESSOR
NADDRESS UART1
NDATA (0-15)
NCONTROL
UART2
UART3
3/WIRE
EE BUS
E/W BUSSES
EE BUS
-12V
+12V
+5V
MID - PLANE
DIN CONN
13
14
15
16
9
10
11
12
17
18
7
8
5
6
3
4
1
2
27
28
29
30
31
32
23
24
25
26
19
20
21
22
DIN 3 ROW
HOT INERSTION
POWER CIRCUIT
POWER FUSSES
VSS
VDD
VCC
Fig. 6-45. Block Diagram for the Dual Modem Front Plug Assembly.
126
Rear Plug Assemblies
The rear plug assembly uses the RS-232, V.35, and
RS-530 cards. See Figures 6-48 through 6-52 for rear card block diagrams.
For RS-232 see Fig. 6-46, and for RJ-232 see
Fig. 6-47 .
For RS-232, RS-530, and V.35 Cards:
- HD1
• 1-2 Ground J3-7, default
• 2-3 Grounded through 100-ohm resistor, J3-7
• 3-4 Floating J3-7
- HD2
• 1-2 Frame ground J3-1
• 2-3 Frame ground through 100-ohm resistor, J3-1
• 3-4 Floating J3-1, default
- HD3
• 1-2 Ground J2-7, default
• 2-3 Grounded through 100 ohm resistor, J2-7
• 3-4 Floating J2-7
- HD4
• 1-2 Frame ground J2-1,
CHAPTER 6: Hardware Configuration
• 2-3 Frame ground through 100-ohm resistor, J2-1
• 3-4 Floating J2-1, default
RJ-232 Card
- HD1
• 1-2 Ground J2-7, default
• 2-3 Grounded through 100-ohm resistor, J2-7
• 3-4 Floating J2-7
- HD2
• 1-2 Ground J3-7, default
• 2-3 Frame ground through 100-ohm resistor, J3-7
• 3-4 Floating J3-7
127
T1 CHANNEL BANK
HD 1
1
2
4
HD 2
1
2
4
C
H
1
DMC
RS-232
STATUS
C
H
2
CPU
HD 3
1
2
4
HD 4
4
3
2
1
DIAG
Fig. 6-46. Dual Modem Rear Plug Assembly, Showing the RS-232 Card.
DMC
RS-232
STATUS
HD 2
1
2
4
Chan 1
HD 2
1
2
4
CPU Chan 2
DIAG
Fig. 6-47. Dual Modem Rear Plug Assembly, Showing the RJ-232 Card.
128
CHAPTER 6: Hardware Configuration
VSS
VDD
VCC
TO MID-PLANE
DIN CONN
1
1
2
1
1 0
9
8
7
6
5
4
3
2
1
1
1
9
8
1 7
1
1
6
5
1
1
4
3
3
3
2
1
3
2
0
9
2
2
8
7
2 6
2
2
5
4
2
2
3
2
2
2
1
0
DIN 2 ROW
HOT INSERTION
POWER CIRCUIT
POWER FUSSES
-12V
+12V
+5V
15
16
17
18
19
20
21
22
23
24
25
26
5
6
7
8
9
10
3
4
1
2
11
12
13
14
ST
- - - -
RT
ALB
- - - -
DTR
RLD
RI
SS
TT
TM
TEST
FGND
SD
RD
RTS
CTS
DSR
GND
DCD
- - - -
- - - -
TST1
SI
TST2
- - - -
RS232 DCE
SLOW
SLOW
SLOW
- - - -
FAST
- - - -
FAST
SLOW
- - - -
SLOW
- - - -
FAST
FAST
FAST
FAST
SLOW
- - - -
FAST
- - - -
- - - -
SLOW
SLOW
SLOW
FAST
SLOW
SLOW
POWER
INPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
POWER
OUTPUT
- - - -
- - - -
INPUT
OUTPUT
INPUT
- - - -
OUTPUT
- - - -
OUTPUT
INPUT
- - - -
INPUT
INPUT
OUTPUT
INPUT
INPUT
OUTPUT
INPUT
ECSI
SCLK
SDI
SDO
ECSI
SCLK
SDI
SDO
TXD
RXD
SCLK
SDI
SDO
SCLK
SDI
SDO
RLCS
6SNC705
MICRCONTROLLER
SYSTEM UART
DATA & CONTROL
SIGNAL MONITOR
3 WIRE I/F
3
4
SERIAL EEPROM
1
2
CS
SK
VCC
DI
DO
ORG
GND
93C46
3 WIRE I/F
8
6
5
FPA TO RPA
CONN I/F
VCC
MSCLK
MSDI
MSDO
RDY' 1
RDY' 2
REQ' 1
REQ, 2
W/R RESISTERS
ID, CONTROL
/32 INPUTS
/6 OUTPUTS
LED*
DSR 2
TST 2
DCD 2
DTR 2
RD2
SD2
CTS2
RTS 2
DSR 1
TST 1
DCD 1
DTR 1
RD1
SD1
CTS1
RTS 1
NRD2
NTD2
NTD1
NRD1
DSR 2
DTR 2
DCD 2
RDL 2
RI 2
TT 2
SI 2
TST 21
TM 2
TST 22
NRD 2
NTD 2
NTD 1
NRD 1
ST 2
SD 2
RD 2
ALB 2
RT 2
SS 2
CTS 2
LED* 1
LED
2 1
ST 1
GREEN
RS232 TRANSCEIVERS
1 PIN 2
1 PIN 3
VCC
1 PIN 18
1 PIN 17
1 PIN 23
1 PIN 5
1 PIN 4
1 PIN 6
1 PIN 20
1 PIN 8
1 PIN 21
1 PIN 22
1 PIN 24
1 PIN 12
1 PIN 11
1 PIN 25
1 PIN 13
2 PIN 15
2 PIN 2
2 PIN 3
2 PIN 18
2 PIN 17
2 PIN 23
2 PIN 5
2 PIN 4
2 PIN 6
2 PIN 20
2 PIN 8
2 PIN 21
2 PIN 22
2 PIN 24
2 PIN 12
2 PIN 11
2 PIN 25
2 PIN 13
HD 4
1
2
3
4
HD 3
1
2
3
4
GND
1 PIN 7
1 R 155
100 1W
2
HD 2
1
2
3
4
HD 1
1
2
3
4
FGND
1 PIN 1
1 R 160
100 1W
2
FGND
2 PIN 1
1 R 156
100 1W
2
GND
2 PIN 7
1 R 157
100 1W
2
DIAG PORT
J1
8
7
6
5
4
3
2
1
IN
OUT
OUT
IN
RJ45
1 PIN 14
1 PIN 2
1 PIN 15
1 PIN 3
1 PIN 16
1 PIN 4
1 PIN 17
1 PIN 5
1 PIN 18
1 PIN 6
1 PIN 19
1 PIN 7
1 PIN 20
1 PIN 8
1 PIN 21
1 PIN 9
1 PIN 22
1 PIN 10
1 PIN 23
1 PIN 11
1 PIN 24
1 PIN 12
1 PIN 25
1 PIN 13
1 PIN 26
BOTTOM
J2
1
9
22
10
23
11
24
12
25
13
26
4
17
5
18
6
19
2
15
3
16
7
20
8
21
2 PIN 8
2 PIN 21
2 PIN 9
2 PIN 22
2 PIN 10
2 PIN 23
2 PIN 11
2 PIN 24
2 PIN 12
2 PIN 25
2 PIN 13
2 PIN 26
2 PIN 1
2 PIN 14
2 PIN 2
2 PIN 15
2 PIN 3
2 PIN 16
2 PIN 4
2 PIN 17
2 PIN 5
2 PIN 18
2 PIN 6
2 PIN 19
2 PIN 7
2 PIN 20
DB26
DCE
CONNECTORS
8
21
9
22
10
23
11
24
12
25
13
26
3
16
4
17
5
18
1
14
2
15
6
19
7
20
TOP
J3
3
16
4
17
5
1
14
2
15
18
6
19
7
20
8
21
9
22
10
23
11
24
12
25
13
26
DB26
8
21
9
22
10
23
11
24
12
25
13
26
3
16
4
17
5
18
1
14
2
15
6
19
7
20
RS232 DCE
DSR
- - - -
GND
DTR
DCD
RDL
- - - -
RI
- - - -
SS
FGND
- - - -
SD
ST
RD
- - - -
RTS
RT
CTS
ALB
TST1
TT
SI
TM
TST2
TEST
POWER
- - - -
INPUT
OUTPUT
OUTPUT
- - - -
INPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
- - - -
POWER
INPUT
OUTPUT
INPUT
- - - -
OUTPUT
- - - -
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
INPUT
INPUT
RS232 DCE
- - - -
SS
TST1
TT
SI
TM
TST2
TEST
FGND
- - - -
SD
ST
RD
- - - -
RTS
RT
CTS
ALB
DSR
- - - -
GND
DTR
DCD
RDL
- - - -
RI
POWER
- - - -
INPUT
OUTPUT
OUTPUT
- - - -
INPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
- - - -
POWER
INPUT
OUTPUT
INPUT
- - - -
OUTPUT
- - - -
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
INPUT
INPUT
Fig. 6-48. Block Diagram for the Dual Modem RS-232 Rear Plug Assembly.
129
T1 CHANNEL BANK
VSS
VDD
VCC
TO MID-PLANE
DIN CONN
8
7
0
9
6
3
2
5
4
1
3
2
5
4
1
8
7
0
9
6
3
2
5
4
1
8
7
0
9
6
2
1
1
1
2
1
1
2
2
2
2
2
2
2
3
2
2
3
3
1
1
1
1
1
1
DIN 2 ROW
HOT INSERTION
POWER CIRCUIT
POWER FUSSES
-12V
+12V
+5V
RJ45
6
7
4
5
8
1
2
3
MODEM INTERFACE
SIG
DSR
DCD
DTR
GND
RD
SD
CTS
RTS
TYPE
SLOW
FAST
SLOW
FAST
FAST
FAST
FAST
DCE
DIR
OUT
OUT
IN
POW
OUT
IN
OUT
IN
DB9
7
8
5
6
9
3
4
1
2
PC DB9 INTERFACE
SIG
DCD
RD
SD
DTR
GND
DSR
RTS
CTS
RI
TYPE
FAST
FAST
FAST
SLOW
SLOW
FAST
FAST
SLOW
DTE
DTR
IN
IN
OUT
OUT
IN
OUT
IN
IN
ECSI
SCLK
SDI
SDO
ECSI
SCLK
SDI
SDO
TXD
RXD
SCLK
SDI
SDO
SCLK
SDI
SDO
RLCS
6SNC705
MICRCONTROLL
SYSTEM UARTER
DATA & CONTROL
SIGNAL MONITOR
3 WIRE I/F
3
4
1
2
SERIAL EEPROM
CS
SK
DI
DO
VCC
ORG
GND
93C46
3 WIRE I/F
8
6
5
FPA TO RPA
CONN I/F
VCC
MSCLK
MSDI
MSDO
RDY' 1
RDY' 2
REQ' 1
REQ, 2
LED*
DSR 2
TST 2
DCD 2
DTR 2
RD2
SD2
CTS2
RTS 2
DSR 1
TST 1
DCD 1
DTR 1
RD1
SD1
CTS1
RTS 1
NRD2
NRD2
NTD1
NTD1
W/R RESISTERS
ID, CONTROL
/32 INPUTS
/6 OUTPUTS
MODEM INTERFACE
DCE
DIR SIG
OUT
OUT
IN
POW
OUT
IN
OUT
IN
6
7
4
5
8
1
2
3
DSR
DCD
DTR
GND
RD
SD
CTS
RTS
LED* 1
LED
2 2
RS232 TRANSCEIVERS
DSR 2
TST 2
DCD 2
DTR 2
RD 2
SD 2
CTS 2
RTS 2
100, 1W
1
GREEN
7
8
5
6
1
2
3
4
TOP
DCE
J3
RJ45
DSR
DCD
DTR
GND
RD
SD
CTS
RTS
2
4 3 2 1
HD2
RS232 TRANSCEIVERS
DSR 2
TST 2
DCD 2
DTR 2
RD 2
SD 2
CTS 2
RTS 2
100, 1W
1
GREEN
TOP
DCE
5
6
7
8
3
4
1
2
J3
RJ45
2
RS232 TRANSCEIVERS
NRD 2
NTD 2
NTD 1
NRD 1
4 3 2 1
HD2
DIAG PORT
J4
7
8
5
6
1
2
3
4
IN
OUT
OUT
IN
RJ45
PC DB9 INTERFACE
DSR
DCD
DTR
GND
RD
SD
CTS
RTS
ADAPTORC
ONNECTION
FOR
PERSONAL
SIG
DCD
RD
SD
DTR
GND
DSR
RTS
CTS
RI
DB9
1
4
5
2
3
6
7
8
9
DTE
DTR
IN
IN
OUT
OUT
IN
OUT
IN
IN
1
O
I
O
I
O
O
I
P
O
I
O
I
O
O
I
P
VCC
Fig. 6-49. Block Diagram for the Dual Modem RJ-232 Rear Plug Assembly.
130
VCC
TO MID-PLANE
DIN CONN
2
2
5
4
2
2
3
2
2
2
1
0
1
1
9
8
1
1
7
6
1 5
1
1
4
3
1
1
2
1
3
3
2
1
3
2
0
9
2 8
2
2
7
6
1 0
9
8
7
3
2
1
6
5
4
DIN 2 ROW
HOT INSERTION
POWER CIRCUIT
POWER FUSSES
+5V
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
4
5
6
1
2
3
7
8
9
10
RS232 DCE
FGND
SDA
RDA
RTSA
CTSA
DSRA
GND
DCDA
RTB
DCDS
TTB
STB
CTSB
SDB
STA
RDB
RTA
- - - -
RTSB
DTRA
- - - -
DSRB
DTRB
TTA
- - - -
TEST
POWER
INPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
POWER
OUTPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
- - - - - -
INPUT
INPUT
- - - - - -
OUTPUT
INPUT
INPUT
- - - - - -
INPUT
CHAPTER 6: Hardware Configuration
ECSI
SCLK
SDI
SDO
ECSI
SCLK
SDI
SDO
TXD
RXD
SCLK
SDI
SDO
SCLK
SDI
SDO
RLCS
68 HC 706
MICRCONTROLER
SYSTEM UART
DATA & CONTROL
SIGNAL MONITOR
3 WIRE I/F
SERIAL EEPROM
1
2
3
4
CS
SK
DI
DO
VCC
ORG
GND
93C46
3 WIRE I/F
8
6
5
FPA TO RPA
CONN I/F
VCC
MSCLK
MSDI
MSDO
RDY' 1
RDY' 2
REQ' 1
REQ, 2
W/R RESISTERS
ID, CONTROL
/32 INPUTS
/6 OUTPUTS
LED*
DSR 2
TST 2
DCD 2
DTR 2
RD2
SD2
CTS2
RTS 2
DSR 1
TST 1
DCD 1
DTR 1
RD1
SD1
CTS1
RTS 1
NRD2
NTD2
NTD1
NRD1
LED* 1
LED
2 1
VCC
SD1
GREEN
RS630 TRANSCEIVERS
1 PIN 14
1 PIN 2
SDB
SDA
RD 1
RTS 1
1 PIN 16
1 PIN 3
1 PIN 19
1 PIN 4
RDB
RDA
RTSB
RTSB
CTS 1
1 PIN 13
1 PIN 5
CTSB
CTSA
DSR 1
DCD 1
RT 1
TT 1
ST 1
DTR 1
1 PIN 22
1 PIN 6
1 PIN 10
1 PIN 8
1 PIN 9
1 PIN 17
1 PIN 11
1 PIN 24
1 PIN 12
1 PIN 15
1 PIN 23
1 PIN 20
DSRB
DSRA
DCDB
DCDA
RTB
RTA
TTB
TTA
STB
STA
DTRB
DTRA
SD 2
RD 2
RTS 2
CTS 2
DSR 2
DCD 2
RT 2
TT 2
ST 2
DTR 2
NRD 2
NTD 2
NTD 1
NRD 1
2 PIN 14
2 PIN 2
2 PIN 16
2 PIN 3
2 PIN 19
2 PIN 4
2 PIN 13
2 PIN 5
2 PIN 22
2 PIN 6
2 PIN 10
2 PIN 8
2 PIN 9
2 PIN 17
2 PIN 11
2 PIN 24
2 PIN 12
2 PIN 15
2 PIN 23
2 PIN 20
HD 4
1
2
3
4
HD 3
1
2
3
4
FGND
1 PIN 1
1 R 160
100 1W
2
GND
1 PIN 7
1 R 155
100 1W
2
SDB
SDA
RDB
RDA
RTSB
RTSA
CTSB
CTSA
DSRB
DSRA
DCDB
DCDA
RTB
RTA
TTB
TTA
STB
STA
DTRB
DTRA
HD 2
1
2
3
4
HD 1
1
2
3
4
DIAG PORT
J1
8
7
6
5
4
3
2
1
IN
OUT
OUT
IN
RJ45
FGND
2 PIN 1
1 R 158
100 1W
2
GND
2 PIN 7
1 R 157
100 1W
2
1 PIN 14
1 PIN 2
1 PIN 15
1 PIN 3
1 PIN 16
1 PIN 4
1 PIN 17
1 PIN 5
1 PIN 18
1 PIN 6
1 PIN 19
1 PIN 7
1 PIN 20
1 PIN 8
1 PIN 21
1 PIN 9
1 PIN 22
1 PIN 10
1 PIN 23
1 PIN 11
1 PIN 24
1 PIN 12
1 PIN 25
1 PIN 13
1 PIN 26
BOTTOM
J2
1
19
7
20
8
21
9
22
10
23
11
24
12
25
13
26
14
2
15
3
16
4
17
5
18
6
DB26
CHANNEL 2
2 PIN 1
2 PIN 14
2 PIN 2
2 PIN 15
2 PIN 3
2 PIN 16
2 PIN 4
2 PIN 17
2 PIN 5
2 PIN 18
2 PIN 6
2 PIN 19
2 PIN 7
2 PIN 20
2 PIN 8
2 PIN 21
2 PIN 9
2 PIN 22
2 PIN 10
2 PIN 23
2 PIN 11
2 PIN 24
2 PIN 12
2 PIN 25
2 PIN 13
2 PIN 26
21
9
22
10
23
11
24
12
25
13
26
18
6
19
7
20
8
1
14
2
15
3
16
4
17
5
TOP
J3
DB26
CHANNEL 1
21
9
22
10
23
11
24
12
25
13
26
18
6
19
7
20
8
1
14
2
15
3
16
4
17
5
RS530 DCE
- - - -
RTB
DSRB
DCDB
DTRB
TTB
TTA
STB
- - - -
CTSB
TEST
FGND
SDB
SDA
STA
RDA
RDB
RTSA
RTA
CTSA
- - - -
DSRA
RTSB
GND
DTRA
DCDA
POWER
IN PUT
INPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
- - - - - -
OUTPUT
INPUT
POWER
INPUT
OUTPUT
- - - - - -
OUTPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
OUTPUT
- - - - - -
OUTPUT
INPUT
19
7
20
8
21
9
17
5
18
6
22
10
23
11
24
12
25
13
26
1
14
2
15
3
16
4
FGND
SDB
SDA
STA
RDA
RDB
RTSA
RTA
CTSA
- - - -
DSRA
RTSB
GND
DTRA
DCDA
- - - -
RTB
DSRB
DCDB
DTRB
TTB
TTA
STB
- - - -
CTSB
TEST
RS530 DCE
POWER
INPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
- - - - - -
OUTPUT
INPUT
POWER
INPUT
OUTPUT
- - - - - -
OUTPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
OUTPUT
- - - - - -
OUTPUT
INPUT
Fig. 6-50. RS-530 Block Diagram for DMC Rear Plug Assembly.
131
T1 CHANNEL BANK
VEE
VSS
VDD
VCC
TO MID-PLANE
DIN CONN
1
1
1
1
3
2
1
0
9
1
1
1
1
1 4
6
5
8
7
3
2
5
4
1
8
7
6
3 2
3
3
1
0
2
2
2
2
1 9
1
0
3
2
2 9
2
2
2
2
2 4
6
5
8
7
DIN 2 ROW
HOT INSERTION
POWER CIRCUIT
POWER FUSSES
-5V
-12V
+12V
+5V
17
18
19
20
13
14
15
16
21
22
23
24
8
9
8
9
6
7
6
7
4
5
4
5
2
3
2
3
10
11
V.35 DCE
- - - -
TTB
STB
- - - -
SDB
STA
RDB
RTA
- - - -
FGND
SDA
RDA
RTS
CTS
DSR
GND
DCD
RTB
- - - -
DTR
- - - -
- - - -
- - - -
TTA
- - - -
TEST
POWER
INPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
POWER
OUTPUT
OUTPUT
- - - - - -
INPUT
OUTPUT
- - - - - -
INPUT
OUTPUT
OUTPUT
OUTPUT
- - - - - -
- - - - - -
INPUT
- - - - - -
- - - - - -
- - - - - -
INPUT
- - - - - -
INPUT
Y
T
-
S
F
K
-
A
AA
C
D
E
B
A
P
R
-
U
-
-
-
-
V
-
-
H
ECSI
SCLK
SDI
SDO
ECSI
SCLK
SDI
SDO
TXD
RXD
SCLK
SDI
SDO
SCLK
SDI
SDO
RLCS
68 HC 706
MICRCONTROLER
SYSTEM UART
DATA & CONTROL
SIGNAL MONITOR
3 WIRE I/F
3
4
1
2
SERIAL EEPROM
CS
SK
DI
DO
VCC
ORG
GND
93C46
3 WIRE I/F
8
6
5
FPA TO RPA
CONN I/F
VCC
MSCLK
MSDI
MSDO
RDY' 1
RDY' 2
REQ' 1
REQ, 2
W/R RESISTERS
ID, CONTROL
/32 INPUTS
/6 OUTPUTS
LED*
DSR 2
TST 2
DCD 2
DTR 2
RD2
SD2
CTS2
RTS 2
DSR 1
TST 1
DCD 1
DTR 1
RD1
SD1
CTS1
RTS 1
NRD2
NTD2
NTD1
NRD1
SD 2
TT 2
RD 2
RT 2
ST 2
LED* 1
LED
2 1
VCC
SD 1
GREEN
V.35 TRANSCEIVERS
1 PIN 14
1 PIN 2
TT 1
1 PIN 11
1 PIN 24
SDB
SDA
TTB
TTA
RD 1
1 PIN 16
1 PIN 3
RDB
RDA
RT 1
ST 1
1 PIN 9
1 PIN 17
1 PIN 12
1 PIN 15
RTA
RTB
STB
STA
CTS 1
RTS 1
DNR 1
DTR 1
DCD 1
RDI 1
1 PIN 5
1 PIN 4
1 PIN 6
1 PIN 20
1 PIN 8
1 PIN 21
CTS
RTS
DSR
DTR
DCD
RDL
2 PIN 14
2 PIN 2
2 PIN 11
2 PIN 24
2 PIN 16
2 PIN 3
2 PIN 9
2 PIN 17
2 PIN 12
2 PIN 15
SDB
SDA
TTB
TTA
RDB
RDA
RTB
RTA
STB
STA
CTS 1
RTS 1
DNR 1
DTR 1
DCD 1
RDI 1
RS232 TRANSCEIVERS
NRD 2
NTD 2
NTD 1
NRD 1
2 PIN 5
2 PIN 4
2 PIN 6
2 PIN 20
2 PIN 8
2 PIN 21
CTS
RTS
DSR
DTR
DCD
RDL
DIAG PORT
J1
8
7
6
5
4
3
2
1
IN
OUT
OUT
IN
RJ45
HD 4
3
4
1
2
FGND
1 PIN 1
1 R 160
100 1W
2
HD 3
3
4
1
2
GND
1 PIN 7
1 R 155
100 1W
2
HD 2
3
4
1
2
FGND
2 PIN 1
1 R 158
100 1W
2
HD 1
3
4
1
2
GND
2 PIN 7
1 R 157
100 1W
2
1 PIN 14
1 PIN 2
1 PIN 15
1 PIN 3
1 PIN 16
1 PIN 4
1 PIN 17
1 PIN 5
1 PIN 18
1 PIN 6
1 PIN 19
1 PIN 7
1 PIN 20
1 PIN 8
1 PIN 21
1 PIN 9
1 PIN 22
1 PIN 10
1 PIN 23
1 PIN 11
1 PIN 24
1 PIN 12
1 PIN 25
1 PIN 13
1 PIN 26
BOTTOM
J2
7
20
8
21
5
18
6
19
1
14
2
15
3
16
4
17
24
12
25
13
26
9
22
10
23
11
DB26
CHANNEL 2
2 PIN 1
2 PIN 14
2 PIN 2
2 PIN 15
2 PIN 3
2 PIN 16
2 PIN 4
2 PIN 17
2 PIN 5
2 PIN 18
2 PIN 6
2 PIN 19
2 PIN 7
2 PIN 20
2 PIN 8
2 PIN 21
2 PIN 9
2 PIN 22
2 PIN 10
2 PIN 23
2 PIN 11
2 PIN 24
2 PIN 12
2 PIN 25
2 PIN 13
2 PIN 26
5
18
6
19
7
20
8
3
16
4
17
1
14
2
15
23
11
24
12
25
21
9
22
10
13
26
TOP
J3
DB26
CHANNEL 1
5
18
6
19
7
20
8
3
16
4
17
1
14
2
15
23
11
24
12
25
21
9
22
10
13
26
- - - -
RTB
- - - -
- - - -
- - - -
TTB
TTA
STB
- - - -
- - - -
TEST
FGND
SDB
SDA
STA
RDA
RDB
RTS
RTA
CTS
- - - -
DSR
- - - -
GND
DTR
DCD
V.35 DCE
POWER
IN PUT
INPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
- - - - - -
OUTPUT
- - - - - -
POWER
INPUT
OUTPUT
- - - - - -
OUTPUT
- - - - - -
- - - - - -
- - - - - -
INPUT
INPUT
OUTPUT
- - - - - -
- - - - - -
INPUT
-
B
H
P
D
-
E
R
T
C
V
P
Y
A
S
-
-
-
-
-
X
-
W
U
AA
-
19
7
20
8
17
5
18
6
1
14
2
15
3
16
4
11
24
12
25
21
9
22
10
23
13
26
CTS
- - - -
DSR
- - - -
GND
DTR
DCD
FGND
SDB
SDA
STA
RDA
RDB
RTS
RTA
- - - -
RTB
- - - -
- - - -
- - - -
TTB
TTA
STB
- - - -
- - - -
TEST
V.35 DCE
POWER
IN PUT
INPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
- - - - - -
OUTPUT
- - - - - -
POWER
INPUT
OUTPUT
- - - - - -
OUTPUT
- - - - - -
- - - - - -
- - - - - -
INPUT
INPUT
OUTPUT
- - - - - -
- - - - - -
INPUT
-
B
H
P
-
E
V
D
R
T
C
P
Y
A
S
-
-
-
-
-
X
-
W
U
AA
-
Fig. 6-51. Block Diagram for the DMC V.35 Rear Plug Assembly.
132
CHAPTER 7: Plug-In Card Installation
7. Plug-In Card Installation
Front plug-in cards are referred to as Front Plug
Assemblies (FPAs), and rear plug-in cards are called
Rear Plug Assemblies (RPAs). You begin the card installation procedures with the front plug-in cards and power supply.
7.1 Power Supply Assemblies
1. Install AC or DC power cord and -48 V power and ring voltage cable as required.
For examples, refer to Figure 5-6, 5-7, or 5-10.
2. Install the power supply front plug assembly into the center slot position.
3. Install the cards as required. (The T1, HSD,
PCM, etc.)
4. Turn on the power switch at the back of the multiplexer shelf.
5. Check to see if the four power LEDs are on.
This indicates that voltages are present.
Network interface
VCC
1
2
4
5
6
1
2
3 GND
PONL *
RJ11/6
Primary control
VCC
1
1
6
P1
5
13
6
14
7
15
8
10
3
11
4
12
1
9
2
1
7
DB15
CTXT
CTXR
FGND
CRXT
CRXR
2
PRI *
3
VCC
8
1
10
3
8
VCC
1
10
3
8
VCC
1
10
2
4
9
7
2
4
9
7
Primary DSX/CSU
J2
7
PRXR
FGND
PTXR
PTXT
6
5
4
3
2
1
8
RJ11/6S
VCC
1
2
2
1
Power LED
J3
8
STXT
STXR
FGND
SRXT
SRXR
3
4
5
6
1
2
7
RJ11/6S
Secondary DSX/CSU
Fig. 7-1. Block Diagram for the Relay Card.
133
T1 CHANNEL BANK
7.2 Network Management Assemblies
MCC Front Plug Assembly (MT442C)
Refer to Fig. 6-39 for assembly layout.
1. Set DIP switches on this card. Switch 1 and 2 are used. See Fig. 6-39. JP1 is factory set at 1-2.
2. Install the MCC front plug assembly into slot 14. Any slot will work, but position 14 is recommended.
MCC Rear Plug Assembly (MT443C)
Refer to Fig. 6-43 for assembly layout.
1. Install rear plug assembly into the slot mated with the MCC front plug assembly.
2. Connect VT100 or VT52 terminal up to the
DB9 pin connection, DCE. If you are using a modem, connect the cable up to the DTE connection. The RJ-45 is used with the Penril
Series 6000 Network Management System.
7.3 T1 Logic Assemblies
T1 Logic Front Plug Assembly (MT440C)
Refer to Fig. 6-7 for assembly layout.
1. Set header: HD3 - Smart/dumb mode. Pins 1 and 2 are MCC-controlled (smart mode).
2. For dumb mode, install T1 logic front plug in slot 7 for the East T1 and into slot 8 for the West
T1. Refer to Table 7-1 for shelf slot positions in the dumb mode.
3. For smart mode, install front plug in any slot.
1 2
1 5
2
3
6
7
EAST T1
3
9
10
11
4
13
14
15
4 8 12 16
* Slots for T1 Logic card
5
17
18
19
20
6
21
22
23
24
Table 7-1. Shelf Slot Positions.
Shelf slot position
7
*
*
*
*
8
*
*
*
*
9
1
2
3
4
6
7
10
5
8
10
11
12
WEST T1
11
9
12
13
14
15
16
13
17
18
19
20
14
21
22
23
24
134
NOTE
Table 7-1 shows all possible channel assignments. An actual installation would have either East or West channels assigned.
T1 Logic DSX-1 Rear Plug Assembly (MT441C)
Refer to Fig. 6-9 for assembly layout.
1. Install rear plug assembly in the slot matching with front T1 logic card.
T1 Logic CSU Rear Plug Assembly (MT465C)
Refer to Fig. 6-10 for assembly layout. Install rear plug assembly in the slot matching with front T1 logic card.
7.4 Voice Assemblies
Quad PCM Voice Front Plug Assembly (MT445C)
Refer to Fig. 6-12 for assembly layout.
1. Set header: HD1 set to 2-3 dumb mode;
1-2 smart mode (MCC controlled)
2. For dumb mode, install front plug assembly in slot #1-6 or 9-14. See Table 7-1.
3. For smart mode, install front plug into any slot.
Quad 4-Wire E&M Rear Plug Assembly (MT446C)
Refer to Fig. 6-17 for assembly layout.
1. Set headers: HD1 factory set to 1-2 and 3-4, which are both shorted.
2. Install rear plug assembly into the slot matching the front quad PCM voice card.
Quad 2-Wire FXS Rear Plug Assembly
Refer to Fig. 6-22 for assembly layout.
1. Check switch positions. Refer to table in
Fig. 6-22 .
2. Install rear plug assembly into the slot matching the front quad PCM voice card.
CHAPTER 7: Plug-In Card Installation
Quad 2-Wire FXO Rear Plug Assembly (MT448C)
Refer to Fig. 6-24 for assembly layout.
1. Set headers: HD1 through HD4 set to 1-2 (900 ohms) and 2-3 (600 ohms); HD5 and HD6 set to 1-2 (ground start mode) and 2-3 (loop start mode).
2. Install rear plug assembly in the slot mated with the front plug assembly quad PCM voice card.
Quad 4-Wire AD Rear Plug Assembly
Refer to Fig. 6-25 for assembly layout.
1. Install rear plug assembly in the slot mated with front plug assembly quad voice card.
7.5 Data Assemblies
High-Speed Data Front Plug Assembly (MT450C)
Refer to Fig. 6-28 for assembly layout.
1. Set headers: HD2 is set to 2-3; HD3 is set to 2-3.
2. Install front plug assembly into any slot. (Dumb mode is not supported when using this card.)
High Speed Data Rear Plug Assemblies
Refer to Fig. 6-32 and 6-33 for assembly layout.
1. Install rear plug assembly into the slot mated with the high speed data front plug assembly.
The rear plug assemblies include the V.35,
RS-232, and RS-530 (MT451C, MT452C,
MT453C). The RS-232 speed is limited to 56 or 64 Kbps.
Dual Data Card Front Plug Assembly (MT470C)
Refer to Fig. 6-30 for assembly layout.
1. Set header: HD3 is set to 1-2.
2. Install front plug assembly in any slot.
135
T1 CHANNEL BANK
Dual Data Card Rear Plug Assemblies (MT471C,
MT472C, MT473C)
Refer to Fig. 6-31 for assembly layout.
1. Set headers: HD1 and HD3 are set to 3-4; HD2 and HD4 are set to 1-2.
2. Install in slot mated with DDC front card. The rear plug assemblies include the V.35, RS-232, and RS-530.
Subrate Dual Data Card Front Plug Assembly
Refer to Fig. 6-32 for assembly layout.
1. Set HD1 to 1-2.
2. Install in the slot mated with OCU-DP.
Office Channel Unit Data Port RPA (MT476C)
Refer to Fig. 6-38 for assembly layout.
1. Install rear plug assembly in the slot mated with the dual data front card.
Dual Modem Front Plug Assembly (MT482C)
Refer to Fig. 6-44 for assembly layout.
1. Install front plug assembly into any slot.
Dual Modem Rear Plug Assemblies
Refer to Figures 6-46 and 6-47 for assembly layouts.
1. Set headers for RS-232, RS-530 and V.35 cards:
HD1 and HD3 are set to 1-2; HD2 and HD4 are set to 3-4. For the RJ-232 card, set HD1 to 1-2 and set HD2 to 1-2.
2. Install rear plug assembly into the slot mated with the dual modem front plug assembly. The rear plug assemblies include the V.35, RS-232,
RJ-232 and RS-530. The RS-232 speed is limited to 56 or 64 Kbps.
136
CHAPTER 8: Configuring the Network
8. Configuring the Network
8.1 Overview of MCC Control Screens
The MCC (Monitor, Control, and Configuration) operating system generates menu screens for operating the T1 Channel Bank. Use Fig. 8-1 as a reference guide or map to reach other screens.
Refer to Chapter 9 for more detailed information about each of the security levels and using the menus. There is more detailed information in
Chapter 10 about configuring the plug-in cards mentioned in Chapter 7.
The main topics covered in this chapter are—
• Overview of the MCC system map
• Screens available to operator by security level
• Main Menu and its sub-menus selected from the
Main Menu
• 8 sub-menus reached through the System
Functions Menu
Basic screen usage—
• The screens permit keyboard control to activate loopbacks and change selectable options.
• The test icon appears in the lower left screen any time that any channel is placed in loopback or test.
• The alarm icon appears in the lower right screen any time that an alarm is detected.
137
T1 CHANNEL BANK
Opening Menu
Main Menu
Password
Edit
Menu
Set
Configured
Channel
Bank
Mode
Reset
Software
Versions
Systems
Functions
Menu
Digital
Milliwatt
Menu
Loopback
Menu
Monitor &
Test Plugin Menu
Configure
Plug-ins
Force
Config
Change
Clone
Config
Set
Config
Switch
Times
Edit
Node
Name
Reset
Shelf
Set TOK
Message
Monitor/Test Plug-ins
Shelf
Assignment
Configure Plug-in
Time
Slot
Assignment
T1
Card
Set
Voice
Card
Set
Data
Card
Set
Modem
Card
Set
Modem
Control
Menu
Phone/
Dial
Menu
S-Register
Menu
Clone
Config
Menu
Profiles/
Defaults
Menu
Clone
Phone
Numbers
Menu
Clone
Profiles
Menu
Quick
Setup
Menu
Fig. 8-1. MCC System Map to Available Menus.
138
CHAPTER 8: Configuring the Network
Table 8-1. Available MCC Menus by Security Level.
Security Level
MENUS
1 Opening menu
2 Password edit menu
3 Main menu
4 Force configuration change
5 System functions menu
6 Digital milliwatt menu
7 Loopback menu
8 Select configure menu
9 Monitor/test plug-ins
10 Configure plug-ins
11 Configure shelf plug-in assignments
12 Set network name
13 Set configure switch times
14 View alarm log
15 Read software versions
16 Set system time
17 Clear EEPROM
18 Reset shelf
19 Set TOK
20 Clone
21 Set configured channel bank mode
N
N
Y
Y
N
N
N
N
N
N
Security Levels
1 2
N
N
N
N
N
Y
N
Y
N
Y
N
Y
N
N
N
N
Y
N
Y
N
Y
Y
N
N
Y
Y
N
N
N
N
N
N
4
N
N
N
N
N
Y
Y
N
N
N
N
N
N
N
N
N
N
N
N
N
N
3
Y
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
139
T1 CHANNEL BANK
8.2 Power Up and Opening Menu
1. Connect a VT100 or VT52 terminal to the DCE port on the rear of the MCC card.
2. Set switches on the MCC front card.
3. After turning on the system, press the Enter key.
The opening screen appears. See Fig. 8-2 for the screen example.
‘A’ active
Datability Networks
T1 Channel Bank
MCC M5.5.0
03/16/94
Enter password:
Fig. 8-2. Opening Menu.
4. Initially, enter THE MASTER to go to the
Password Edit Menu. The MCC is shipped with this default password: THE MASTER. You must use all upper-case letters. Refer to Chapter 9 for more security-level information and using the various menus. If you decide to change the password from the factory default, you must write it down somewhere. If you forget the new password, there is no way to find out through the system what the new password is. A new
MCC would have to be installed.
5. Enter passwords for the security level you need, such as 1, 2, 3.
• Level 1 password has one function: system functions.
• Level 2 password has three functions: system functions, loopback menu, and digital milliwatt.
140
Thu 12:48:02
• Level 3 password includes the functions listed on the main menu shown in Fig. 8-3.
• THE MASTER is the key to the Password Edit
Menu, which uses a level 4 security in order to set or edit levels 1 through 4 passwords.
6. Press esc to exit the password menu and return to the opening menu.
7. Enter a password and Enter to reach the menu you want (see Table 8-1). For example, entering
3 will take you to the main menu.
CHAPTER 8: Configuring the Network
8.3 Main Menu
This is the main routing menu that lets you select (a route) to the other menus. The display you see will depend on the type security level that has been set up. See Chapter 9 for more information on security levels and how to use the other menus. The main menu lists the menu selections available to the operator. For example, depending on the password you type in on the opening menu, you will reach menus with the functions: in Fig. 8-3:
‘A’ active MAIN MENU
Node Name:
1—System functions
2—Loopback Menu
3—Digital Milliwatt Menu
4—Monitor/Test Plug-ins
5—Configure Plug-ins
6—Force configuration change
7—Clone Configurations A—> (B,X,Y)
Select function:
ESC—Login Screen
Mon 13:10:25
Fig. 8-3. Main Menu.
141
T1 CHANNEL BANK
When you are in the main menu, you can select the sub-menus such as the monitor/test plug-ins.
For example, the monitor/test plug-ins menu allows the operator to select a plug-in card to obtain configuration data, control loopbacks, and to see the T1 plug-in’s performance on the T1 line. It does not permit configuration changes.
The sub-menus are presented in this manual in the order in which they appear on the main menu screen with the corresponding numbers of the main menu.
8.3.1 1— S
YSTEMS
F
UNCTIONS
M
ENU
This menu displays choices such as viewing the alarm log or the software version number. See
Fig. 8-4 .
The screens and descriptions of the 8 sub-menus from the System Functions Menu are on the following pages.
‘A’ active Mon 13:19:00 SYSTEM FUNCTIONS MENU
Node Name:
1—Read Software Versions
2—View Alarm Log
3—Set System Date/Time
4—Clear Disk Files
5—Set Configuration Switch Times
6—Edit Node Name
7—Reset Shelf
8—Set TOK Message
Select function:
ESC—Main Menu
Fig. 8-4. System Functions.
142
CHAPTER 8: Configuring the Network
(1) Read Software Versions
This menu identifies the software version on each card in the chassis.
See Fig. 8-5.
‘A’ active
Shelf 1
SHELF SOFTWARE VERSIONS
Node Name:......................
Shelf 2
Slot FPA Software Date Slot FPA
------------------------------------------------------------------------------------------------------
Software
1 MCC
2 HSD
M5.5.0
T5.3.0
3
4 HSD
5 DDC
6 PCM
7 T1
8 T1
9 T1
T3.3.6
D5.3.0
T3.2.3
T5.3.0
T3.3.6
T5.3.0
10 SDDC D5.4.0
11 DMC
12 DMC
13 DMC
14
Z5.3.0
Z5.3.0
Z5.5.0
03/16/94
01/04/94
09/30/92
01/04/94
05/19/92
01/04/94
09/30/92
01/04/94
03/07/94
02/07/94
01/04/94
03/15/94
9
10
11
12
13
14
7
8
5
6
3
4
1
2
Thu 12:39:06
Date
Fig. 8-5. Read Software Versions.
(2) Alarm Log
When you select this option, a list of the most recent alarms will be displayed. See Tables 10-1 and 10-2 for lists of alarms and their meanings.
143
T1 CHANNEL BANK
‘A’ active
13:09:42
13:09:42
15
15
MCC MCCNET
MCC MCCNET
ALARM LOG
Mode Name:
Time Slot FPA RPA Port Class Event Description
-------------------------------------------------------------------------------------------------------------------
00
00
A
1
Mon 13:19:25
CLA Major Alarm Cleared
CRS Card Reset
C—Clear Alarm Log ESC—Previous Menu
Fig. 8-6. Alarm Log.
Fig. 8-7 shows that a test-mode condition has been detected in the system.
13:20:47
13:20:34
13:20:25
13:20:25
13:20:23
13:20:14
13:20:13
13:20:03
13:20:03
13:20:02
13:20:01
13:20:01
13:20:00
13:20:00
********
* TEST *
********
‘Y’ active ALARM LOG Mon 13:20:54
Mode Name:
Time Slot FPA RPA Port Class Event Description
------------------------------------------------------------------------------------------------------
13
07
08
08
07
15
07
07
08
14
08
08
08
08
T1
T1
T1
T1
CSU
CSU
CSU
CSU
T1
T1
DSX1
DSX1
T1 CSU
PCM 4W E&M
HSD RS232
T1 DSX1
T1
T1
CSU
CSU
T1 DSX1
MCC MCCNET
NA A
NA E
NA A
NA M
NA E
NA A
NA A
06 M
NA M
NA A
NA A
NA M
NA E
00 M
CLA Major Alarm Cleared
TON Test Mode On
BLU BLUE Alarm Condition
TPA Trunk Processing Alarm
TON Test Mode On
CLA Major Alarm Cleared
CLA Major Alarm Cleared
CKS Checksum Failure
CKS Checksum Failure
YEL YELLOW Alarm Condition
RED RED Alarm Condition
TPA Trunk Processing Alarm
TOF Test Mode Off
CAY West T1 Failure—Switch to ‘Y’
C—Clear Alarm Log ESC—Previous Menu
Fig. 8-7. Alarm Log (with TEST).
144
(3) Set System Time
When you first power up the T1 Channel Bank, the system clock may not correspond to the correct time for the time zone in which you live. The factory time setting is set according to Eastern
Standard Time. You may need to change the time for a Daylight Saving Time setting. By using this menu choice, you can easily make these time changes.
CHAPTER 8: Configuring the Network
Refer to Fig. 8-8 for an example of this screen. The top line shows the current time that is programmed.
The next line is the edit line, where you can type in a new time setting. As you type in the new time, you will need to add the colon in order for the system to accept the time change.
‘A’ active SET SYSTEM DATE/TIME MENU
Node Name:
Current date: 09/28/93
RETURN—Enter Data
Current time: 13:54:36
Current day of week: Tuesday
New time (hh:mm:ss): —>
New date (mm/dd/yy):
<Arrow Keys>—Select Field
ESC—Previous Menu
Tue 13:54:36
Fig. 8-8. Set System Time Menu.
145
T1 CHANNEL BANK
(4) Clear EEPROM
When you choose 4 from the system functions menu, the question, “Clear EEPROMS?” and “Are you sure?” appears. Enter Y or N. If you choose Y, all configurations will be erased except the password,
“THE MASTER”.
(5) Set Configuration Switch Times
This menu allows you to select the time of day for a configuration switch. The system may be programmed to switch from configuration “A” to configuration “B” and from “B” to “A” at any time within a 24 hour period. Off in this position disables the switch times. See Fig. 8-9.
‘A’ active SET CONFIGURATION SWITCH TIMES MENU Tue 13:54:59
Node Name:
Mon-Fri
----------- ----------
Sat-Sun
Switch to A configuration at: (Off/hh:mm:ss)
Switch to B configuration at: (Off/hh:mm:ss)
—> Off
Off
Off
Off
RETURN—Enter Data <Arrow Keys>—Select Field
ESC—Previous Menu
Fig. 8-9. Set Configuration Switch Times.
(6) Edit Node Name
Type in the name of the node and press Enter. You can enter only one name with a limit of 10 characters each time you use this menu.
(7) Reset Shelf
Option 7 resets all the cards in the chassis.
(8) Set TOK Message Menu
Set the TOK (Time Of acknowledgment) message
(1 second to 59 minutes 59 seconds) through the
NMS. See Fig. 8-10. The TOK message informs the
NMS of the status of the T1 Channel Bank.
146
‘A’ active SET TOK MESSAGE
Node Name:
CHAPTER 8: Configuring the Network
Tue 13:55:13
TOK message interval (Off/mm:ss): Off
ESC—Previous Menu
Fig. 8-10. Set TOK Message Menu.
The TOK is an NMS option, and an NMS is required to use the TOK. The time is displayed in minutes and seconds (mm:ss). The time interval will automatically appear on the terminal screens and automatically adjusts for leap year and for the correct day of the week.
If you want to enable the TOK message intervals, enter the time interval in minutes and seconds.
To disable the TOK message, enter OFF for the mm:ss only message. The TOK factory default is set to OFF unless it is connected to an NMS.
If the chassis fails, the TOK messages will stop.
Then the NMS will report (alarm) that a problem exists.
8.3.2 2 — L
OOPBACK
M
ENU
The loopback menu lists all time slots associated with the selected node (East T1 and West T1). See
Fig. 8-11.
You can put the channel into loopback by entering the T1 direction (E or W) and time slot number. For example, enter E01 for East time slot
1. You can put fractional data channels (that use more than one time slot) into loopback when you select any time slot within the set.
147
T1 CHANNEL BANK
‘A’ active LOOPBACK MENU
Node Name:
Tue 13:55:29
East Timeslots
Loopback state
--------------------
E01 N
E02 N
E03 N
E04 N
E05 N
E06 N
E07 N
E08 N
E09 N
E10 N
E11 N
E12 N
E13 N
E14 N
E15 N
E16 N
E17 N
E18 N
E19 —
E20 —
E21 —
E22 —
E23 N
E24 N
Enter Timeslot (E1, W12, etc):
R—Reset all loopbacks ESC—Main Menu
West Timeslots
Loopback state
-------------------
W01 —
W02 —
W03 —
W04 —
W05 —
W06 —
W07 —
W08 —
W09 —
W10 —
W11 —
W12 —
W13 —
W14 —
W15 —
W16 —
W17 —
W18 —
W19 —
W20 —
W21 —
W22 —
W23 —
W24 —
Fig. 8-11. Loopback Menu.
How to Activate a Loopback Test
See Fig. 8-11 for the loopback menu that shows the state of loopbacks in the East and West time slots.
The MCC operator can use this menu to loopback any channel in the East or West T1. But the operator must specify which direction the loopback takes. For example, the selection is simply made by entering the time slot as E01 for East T1 or W01 for the West T1. Pressing the R key causes all loopbacks to be reset.
Since the high-speed data card can be configured for more than one time slot, any time slot in the set entered will result in the data card going into loopback. The display will indicate (Y) loopback on all channels in the set. See Fig. 8-12 for loopback directions.
148
E01 in loop
Network
Example: Voice Card
Loops back to network
CHAPTER 8: Configuring the Network
E01 in loop
Network
Example: data card
Loops both ways
Fig. 8-12. Loopback Direction for Voice and Data Cards.
8.3.3 3 — D IGITAL M ILLIWATT M ENU
When you select a time slot in the digital milliwatt menu, you will send a digital milliwatt, which is a true DBM signal, a 1000 Hz tone. This overwrites the incoming data to the voice card with the digital milliwatt code. It functions well with 4-wire AD and
4-wire E & M, but not always with the loopstart or ground start. See Fig. 8-13.
‘A’ active
East Timeslots
Milliwatt state
------------------
E01—Off
E02—Off
E03—Off
E04—Off
E05—Off
E06—Off
E07—Off
E08—Off
E09—Off
E10—Off
E11—Off
E12—Off
E13—Off
E14—Off
E15—Off
E16—Off
E17—Off
E18—Off
E19—Off
E20—Off
E21—Off
E22—Off
E23—Off
E24—Off
LOOPBACK MENU
Node Name:
Tue 13:55:29
West Timeslots
Milliwatt state
------------------
W01—Off
W02—Off
W03—Off
W04—Off
W05—Off
W06—Off
W07—Off
W08—Off
W09—Off
W10—Off
W11—Off
W12—Off
W13—Off
W14—Off
W15—Off
W16—Off
W17—Off
W18—Off
W19—Off
W20—Off
W21—Off
W22—Off
W23—Off
W24—Off
Fig. 8-13. Digital Milliwatt Menu.
149
T1 CHANNEL BANK
How to Send Digital Milliwatt
See Fig. 8-13 for the digital milliwatt menu that shows the state of digital milliwatt in the East and
West time slots. The MCC operator can use this menu to implement digital milliwatt in any channel in the East or West T1. But the operator must specify which direction the digital milliwatt takes.
See Fig. 8-14. For example, the selection is simply made by entering the time slot as E01 for East T1 or
W01 for the West T1. Pressing the R key causes all cards to be reset.
Use digital milliwatt for voice only. The display will indicate (Y) on all channels in the set using the digital milliwatt code.
E01 milliwatt on
Network
Milliwatt tone out
Fig. 8-14. Digital Milliwatt Direction.
150
CHAPTER 8: Configuring the Network
8.3.4 4 — M
ONITOR
/T
EST
P
LUG
-
INS
M
ENU
This menu displays status on the T1 line and permits activation of loopback. You also can monitor alarms and the number of bipolar violations (BPV) received. See Fig. 8-15.
‘A’ active MAIN MENU
Node Name:
1—System functions
2—Loopback Menu
3—Digital Milliwatt Menu
4—Monitor/Test Plug-ins
5—Configure Plug-ins
6—Force configuration change
7—Clone Configurations A—> (B,X,Y)
Select function:
ESC—Login Screen
Mon 13:18:25
Fig. 8-15. Monitor/Test Plug-ins.
151
T1 CHANNEL BANK
8.3.5 5 — C
ONFIGURE
P
LUG
-
INS
M
ENU
Enter the Configure Plug-ins menu from the main menu by typing 5 and pressing Enter. See
Fig. 8-16 and Chapter 10 for more information on using these menus. The Configure Plug-ins menus consist of assignment menus that also allow access to plug-in card configuration menus for the T1 configuration, the quad PCM voice configuration, and the high-speed data card configuration.
‘A’ active CONFIGURE SHELF PLUG-IN ASSIGNMENTS
ESC—Main menu
Tue 13:39:33
‘A’ configuration
Shelf 1 Node Name: Shelf 2
5
6
3
4
Slot FPA RPA Status Timeslot Slot FPA RPA Status
--------------------------------------------------------------------------------------------------------------------------------
1
2
MCC MCCNET Ok 1
2
3
4
5
6
7
8
SDDC OCU
T1 CSU
9 DDC V35-A
10 PCM FX0
11 HSD V35-A
12
13 DMC RJ232
14
Ok
Ok
Ok
Ok
Ok
Ok
E 1 E 2
E Primary
E 3 E 4
E 5 6 7 8
E 9-22
E 23 E 24
7
8
9
10
11
12
13
14
Enter Shelf and Slot (1/12, etc.):
RETURN—View Timeslot Display
Timeslot
Fig. 8-16. Configure Plug-ins Menu.
152
CHAPTER 8: Configuring the Network
8.3.6 6 — F
ORCE
C
ONFIGURATION
C
HANGE
Once you select one of the configurations from this menu, the system automatically sends a message to the other cards that causes a configuration switch to the newly chosen configuration. Then, the new choice—A, B, X, or Y—will be active. See Fig. 8-17.
‘A’ active CONFIGURATION SELECT MENU Tue 13:56:40
Node Name:
A—Main configuration
B—Alternate configuration
X—East fail mode configuration
Y—West fail mode configuration
Select configuration:
ESC—Main Menu
Fig. 8-17. Force Configuration Change.
153
T1 CHANNEL BANK
8.3.7 7—C
LONE
C
ONFIGURATION
A—>(B, X, Y)
This option copies A to B, X, and Y automatically.
See Fig. 8-18. Once you select 7 from the main menu, the screen will display: “Writing new configurations to shelf and EEPROM.” You will observe the shelf number, MCC EEPROM information, and the circuit name(s).
‘A’ active MAIN MENU
Node Name:
1—System functions
2—Loopback Menu
3—Digital Milliwatt Menu
4—Monitor/Test Plug-ins
5—Configure Plug-ins
6—Force configuration change
7—Clone Configurations
Select function:
A—> (B,X,Y)
ESC—Login Screen
Mon 13:18:25
Fig. 8-18. Clone Configuration Selection.
154
CHAPTER 8: Configuring the Network
8.3.8 8—S
ET
C
ONFIGURED
C
HANNEL
B
ANK
M
ODE
Select this option from the main menu to configure the T1 Channel Bank to operate in the A configuration without an MCC card installed. See
Fig. 8-19 .
‘X’ active MAIN MENU
Node Name: D&I
1—System functions
2—Loopback Menu
3—Digital Milliwatt Menu
4—Monitor/Test Plugins
5—Configure Plugins
6—Force configuration change
7—Clone Configurations A —> (B,X,Y)
8—Set Configured Channel Bank Mode
Select function:
ESC—Login Screen
06:29:50
Fig. 8-19. Set Configured Channel Bank Mode Option.
155
T1 CHANNEL BANK
9. Security Levels
The following four security levels (or functions) are available when a terminal is connected to the MCC either through a direct cable or a dial modem.
9. Level 4 Security
See Fig. 9-1 for an overview of the MCC system and how to access Level 4 from the system “map.”
A Level 4 security password gives the operator the ability to edit all passwords. When you turn on a new system, the default password is “THE
MASTER.” The Level 4 Password permits access to the Password Edit Menu. You can enter this menu from the opening screen by keying in THE
MASTER at the prompt. Press the Enter key.
If you decide to change the passwords from the factory default, write them down for later reference.
If you forget the new passwords, there is no way to find out through the system what those new passwords were. Call Technical Support if this happens.
156
Reset
Software
Versions
Opening Menu
CHAPTER 9: Security Levels
Password
Edit
Menu
Level 4
Set
Configured
Channel
Bank
Mode
Level 2-3
Main Menu
Systems
Functions
Menu
Digital
Milliwatt
Menu
Loopback
Menu
Monitor &
Test Plugin Menu
Configure
Plug-ins
Force
Config
Change
Level 3
Clone
Config
Set
Config
Switch
Times
Edit
Node
Name
Reset
Shelf
Set TOK
Message
Monitor/Test Plug-ins Level 3
Shelf
Assignment
Configure Plug-in
Time
Slot
Assignment
T1
Card
Set
Voice
Card
Set
Data
Card
Set
Modem
Card
Set
Modem
Control
Menu
Phone/
Dial
Menu
S-Register
Menu
Clone
Config
Menu
Profiles/
Defaults
Menu
Clone
Phone
Numbers
Menu
Clone
Profiles
Menu
Fig. 9-1. Overview of Accessing Menus by Security Level.
Quick
Setup
Menu
157
T1 CHANNEL BANK
Password Edit Menu
Refer to Fig. 9-2 for a screen layout of the Password
Edit Menu. Use this menu to set the password. Use the Enter key to scroll through Levels 1-4 and to place the cursor on a security level where you can edit the passwords with the keyboard. The letters you type in are case-sensitive, which means that upper and lower-case letters are treated as separate characters. A space is a valid character.
‘A’ active PASSWORD EDIT MENU Thu 16:35:55
Current Passwords
-------------------------------------------------------------------------------------------------------------------------------
Level 1—Monitor Network —> 1
2 Level 2—Test network
Level 3—Test T1 and Configure
Level 4—Edit Passwords
3
THE MASTER
RETURN—Select Item ESC—Main Menu
Fig. 9-2. Password Edit Menu.
9.2 Level 3 Security
See Fig. 9-3 for the parts of the MCC system that are affected by level 3 security. Level 3 provides the full capability of the MCC except for password-edit functions.
This includes the ability to:
• Configure a plug-in
• Monitor and test a plug-in
• Activate loopbacks
158
CHAPTER 9: Security Levels
Opening Menu
Main Menu
Edit Passwords not available in Level 3
Set
Configured
Channel
Bank
Mode
Reset
Software
Versions
Systems
Functions
Menu
Digital
Milliwatt
Menu
Loopback
Menu
Monitor &
Test Plugin Menu
Configure
Plug-ins
Force
Config
Change
Clone
Config
System
Time
Set
Config
Switch
Times
Edit
Node
Name
Reset
Shelf
Set TOK
Message
Monitor/Test Plug-ins
Shelf
Assignment
Configure Plug-in
Time
Slot
Assignment
T1
Card
Set
Voice
Card
Set
Data
Card
Set
Modem
Card
Set
Modem
Control
Menu
Phone/
Dial
Menu
S-Register
Menu
Clone
Config
Menu
Profiles/
Defaults
Menu
Clone
Phone
Numbers
Menu
Clone
Profiles
Menu
Quick
Setup
Menu
Fig. 9-3. Level 3 Security.
159
T1 CHANNEL BANK
9.3 Level 2 Security
Refer to Fig. 9-4 for the parts of the MCC system that are affected by Level 2 security. At Level 2 the master MCC can:
• View software versions
• View alarm log
• Perform loopbacks on channels
• Send digital milliwatts on all channels
Opening Menu
Main Menu
Loopback
Menu
Digital
Milliwatt
Menu
System
Functions
Menu
View
Alarm
Log
Read
Software
Versions
Fig. 9-4. Accessing Level 2 Security.
160
9.4 Level 1 Security
Refer to Fig. 9-5 for the way to access level 1 security.
Level 1 provides access for viewing alarms and determining software versions.
Opening Menu
CHAPTER 9: Security Levels
Main Menu
System
Functions
Menu
View
Alarm
Log
Read
Software
Versions
Fig. 9-5. Accessing Level 1 Security.
161
T1 CHANNEL BANK
10. Configuring and Monitoring
Plug-ins
Use these menus to configure and monitor both
East and West T1 cards.
10.1 Configuring the T1 Network
The series of Configure Plug-ins menus consists of three assignment menus and access to eight types of plug-in cards.
1. Enter the Configure Plug-ins menus from the main menu by typing 5 and pressing Enter. See
Fig. 10-1 .
2. When you are asked which configuration, type
A . Configure all cards under configuration A.
Exit configuration A.
3. Exit the configuration by answering yes to write the configuration into memory.
4. Enter the clone feature. Copy A to B, X, or Y as required.
‘A’ active CONFIGURATION SELECT MENU
Node Name:
A—Main configuration
B—Alternate configuration
X—East fail mode configuration
Y—West fail mode configuration
Select configuration:
ESC—Main Menu
Fig. 10-1. Configuration Select Menu.
Mon 13:11:05
162
10.2 Configuring Shelf Plug-In Assignment Menu
The assignment menus display the channel cards by either shelf and slot position (Shelf Plug-in
Assignment menu) or time slot position (Time
Slot Assignment menu). There are two time slot assignment menus: one for the East T1 card and one for the West. See Figures 10-2 and 10-3 for the shelf plug-in or time-slot assignments for the configurations.
These menus allow you to select a plug-in card to obtain or change configuration data for the T1 card set, the voice card set, the data card sets, and the modem card set. See Fig. 10-4 for more information on how to configure the T1 logic card. You must configure the T1 logic card before you configure the other circuits. Do the basic A configuration before you do the B, X, or Y configurations. With configuration A, all options are available. Not all configuration options are available in X and Y. Use the B menu for an alternate configuration.
CHAPTER 10: Configuring and Monitoring Plug-ins
The Shelf Plug-in Assignments menu will list by chassis slot position for both shelf 1 (main shelf) and shelf 2 (expansion shelf) the cards inserted in a chassis. See Fig. 10-2. This screen displays:
• The type of front plug-in card
• The type of rear plug-in card
• Status—see Table 10-1 for status indications
• T1 line (East or West) to which a T1 logic card is assigned, and whether it is configured as a primary or secondary card
• Time slot on East or West T1 to which a channel is assigned
‘A’ active
‘A’ configuration
Shelf 1
CONFIGURE SHELF PLUG-IN ASSIGNMENTS Tue 13:39:33
Node Name: Shelf 2
5
6
3
4
Slot FPA RPA Status Timeslot Slot FPA RPA Status Timeslot
-------------------------------------------------------------------------------------------------------------------------------
1
2
MCC MCCNET Ok 1
2
3
4
5
6
7
8
SDDC OCU
T1 CSU
9 DDC V35-A
10 PCM FX0
11 HSD V35-A
12
13 DMC RJ232
14
Ok
Ok
Ok
Ok
Ok
Ok
E 1 E 2
E Primary
E 3 E 4
E 5 6 7 8
E 9-22
E 23 E 24
7
8
9
10
11
12
13
14
Enter Shelf and Slot (1/12, etc.):
ESC—Main menu RETURN—View Timeslot Display
Fig. 10-2. Configure Shelf Plug-in Assignments Menu.
163
T1 CHANNEL BANK
Status Messages
OK
Alarm
Alarm
Alarm
R. Plug
Reset
Test
CBmode
EEPROM
SigCON
Table 10-1. Summary of Card Status Indications.
Status
No alarms
T1 TPA alarm (CGA)
T1 Red alarm
T1 Yellow alarm, rear card missing
Rear card missing
Card was reset
Card is in loopback
Card is jumpered to operate in channel bank mode
Card’s EEPROM has failed
Signaling conflict exists on this card
164
Timeslot Assignment (East and West)
This screen displays the plug-in cards by time slot.
See Fig. 10-3. You access this screen from the Shelf
Plug-in Assignment menu by using the Enter key.
The Enter key permits you to scroll through the selections of the configure shelf plug-in assignment menu and the Configure Timeslot Assignment menus for East and West. Use the other keyboard conventions as shown at the bottom of the screen to further configure each card. From the screen in
Fig. 10-3, you can enter a time slot to select the individual plug-in card. This menu displays circuit names by time slot.
CHAPTER 10: Configuring and Monitoring Plug-ins
‘A’ active CONFIGURE EAST T1 TIMESLOT ASSIGNMENTS Mon 13:16:52
Node Name:
7
8
9
10
11
12
5
6
3
4
1
2
TS Name FPA RPA Stat Loc TS Name FPA RPA Stat Loc
---------------------------------------------------------------------------------------------------------------
DDC V35-A Ok
SDDC OCU Ok
1/02
1/03
13
14
---- Idle ----
---- Idle ----
HSD
HSD
HSD
HSD
V35-A Ok
V35-A Ok
V35-A Ok
V35-A Ok
1/04
1/04
1/04
1/04
15
16
17
18
---- Idle ----
---- Idle ----
---- Idle ----
---- Idle ----
HSD V35-A Ok
---- Idle ----
DMC RS232 Ok
---- Idle ----
---- Idle ----
---- Idle ----
1/04
1/11
19
20
21
22
23
24
---- Idle ----
---- Idle ----
PCM
PCM
PCM
PCM
4W AD Ok
4W AD Ok
4W AD Ok
4W AD Ok
1/12
1/12
1/12
1/12
Enter Timeslot:
ESC—Main Menu
Fig. 10-3. Time-slot Assignment Menu.
165
T1 CHANNEL BANK
10.3 T1 Configuration Menu
Use the menu shown in Fig. 10-4 to set up configuration parameters for the T1 card. You can access this menu through the following steps:
1. From the main menu, type 5 and press the
Enter key.
2. Choose configuration A from the list by entering the letter A, and press the Enter key.
Press Esc to return to the main menu.
3. When the screen for the Configure Shelf Plugin Assignment menu appears, enter the shelf and slot position you need, such as 1/8. Press the Enter key.
4. When the T1 configuration menu appears, you can use the Enter key to scroll through the configuration options. If you want to change an option, press the space bar to toggle another choice.
The TEST and ALARM notices could be on or off.
The operator can switch to the monitor/test menu from this menu by entering T.
‘A’ active
Shelf 1 Slot 7
‘A’ CONFIGURATION MENU
T1 DSX1 Ok
-----------------------------------------------------------------------------------------------------------------
Node Name:
Card State (Offline, Online)
Direction
—> Online
East
Primary/Secondary
Node Type (End, D&I)
Line Code (AMI, B7ZS, B8ZS)
Framing (ESF, D4)
Primary
End
B8ZS
ESF
Timing (Internal, Loop)
Transmit Line Buildout
Received Line Buildout
SPACE—Change Choice
T—Monitor/Test Menu
<Arrow Keys>—Select Field
ESC—Previous Menu
Internal
0-133 ft
N/A
Mon 13:12:15
Fig. 10-4. T1 Configuration menu with CSU.
166
The fields of this screen are:
Card State (Off-Line, On-Line)
This selection permits an operator to remove a T1 card off-line or activate a card on-line.
Direction (East, West)
This allows the selected plug-in T1 logic card to be designated an East T1 or a West T1. The East T1 will provide shelf timing.
Primary/Secondary (Pri/Sec)
When two T1 cards are configured for redundant logic, one is designated the primary; the other is secondary. This allows two cards to be assigned to one T1 line without the MCC reporting a conflict. It also establishes which T1 card will be on-line after powerup. This selection permits designating a primary and secondary T1 logic card for either direction (East, West) for redundant T1 card sets.
The back-up, or secondary, T1 card can be brought on-line and the primary T1 card can be taken offline in the event of a failure.
For example, configure the East T1 cards as follows:
• In the A configuration, Pri is on-line and Sec is off-line.
• In the X configuration, Pri is off-line and Sec is on-line.
This occurs because a failure on the East side will result in an automatic fallback from A to X. A failure on the West side creates a fallback from A or
B to Y.
Node Type (End)
An end multiplexor is selected when only one T1 line is actively associated with the T1 Channel Bank.
• When END node is selected, all ones are put into DS0 (time slots) if no channel card is assigned to the channel slot or the card is removed.
CHAPTER 10: Configuring and Monitoring Plug-ins
Line Code (AMI, Bit 7 Stuff and B8ZS)
This selects the method the multiplexer uses to protect against transmitting more than 15 zeros:
• AMI—No rule is applied. No alternation of the multiplex bits is done when zeros are detected in the stream. This can be used in applications where the data terminal equipment connected to the multiplexor ensures that no more than 15 zeros are transmitted.
• Bit 7 stuff conforms to AT&T publications 43801 and inserts a 1 in Bit 7 of voice time slot that contains all zeros in bits 1-8.
• B8ZS conforms to AT&T publications 43801 and
62411 and transmits a specified bipolar violation code on the T1 line if 8 zeros are detected. This is used on T1 lines compatible with B8ZS. No restrictions are placed on the data transmitted in a time slot. This is referred to as clear channel service. (N x 56 or N x 64 data can be used.)
Framing (ESF, D4)
This selects either ESF or D4:
• ESF conforms to the Extended Superframe
(AT&T publication 62411) ESF.
• D4 conforms to the D4 Superframe format standard.
Timing (Int, Loop)
This selects the timing mode for the T1 logic card.
Although the West T1 logic card will always slave its timing to the East card, this selection is applicable for the West card because it determines the default mode of the West card when the East card has failed or lost timing reference. The selections are:
• Internal - This selects the system clock to be referenced to a local oscillator. Select this only when the multiplexor is to provide master timing.
• Loop - This selects the system clock to be referenced to the received signal and is used in loop timing applications. The system clock is derived from the receive T1 line signal.
167
T1 CHANNEL BANK
All installations should have a timing plan. A timing plan establishes the timing selection for all modes in a network of multiplexors. See Chapter 10 for more information about the network timing plan.
Line Buildout (CSU)
Refer to Fig. 10-4. For line compensation, select a line attenuation from the following: 0.0dB, 7.5dB,
15.0dB, and 22.5dB. Use the largest attenuation setting possible without causing a yellow alarm at the end being configured.
‘A’ active ‘A’ CONFIGURATION MENU
Shelf 1 Slot 8 T1 CSU Ok Node Name:
-----------------------------------------------------------------------------------------------------------------
Card State (Offline, Online) —> Online
Mon 13:12:31
Direction
Primary/Secondary
Node Type (End, D&I)
Line Code (AMI, B7ZS, B8ZS)
Framing (ESF, D4)
Timing (Internal, Loop)
Transmit Line Buildout
Received Line Buildout
SPACE—Change Choice
T—Monitor/Test Menu
<Arrow Keys>—Select Field
ESC—Previous Menu
West
Primary
End
B8ZS
ESF
Loop
0.0 dB
0.0 dB
Fig. 10-5. T1 Configuration Menu With DSX.
168
Transmit Line Buildout (DSX)
Refer to Fig. 10-5. For line compensation, select a cable based upon line length from the following—
0-133 feet, 133-266 feet, 266-399 feet, 399-533 feet,
533-655 feet.
Received Line Buildout
The received line buildout is detected by the T1 card when a CSU is installed. See Fig. 10-4. This field is not applicable when a DSX rear card is installed.
10.4 Quad PCM Voice Card Configuration Menu
Use the menu shown in Fig. 10-6 to set up configuration parameters for the quad PCM card.
You can access this menu through the following steps:
1. From the main menu, type in 5 - Configure
Plug-ins, and press the Enter key.
CHAPTER 10: Configuring and Monitoring Plug-ins
2. Choose a configuration from the list by entering the letter A, B, X, or Y and press the
Enter key. Press Esc to return to the main menu.
3. When the screen for the shelf plug-in assignment menu appears, enter the shelf and slot position you need, such as 1/10. Press the
Enter key.
4. When the PCM configuration menu appears, you can use the arrow keys to scroll through the configuration options. If you want to change an option, press either + or - to toggle another choice.
The operator can switch to the monitor/test menu from this menu by entering T.
‘A’ active ‘A’ CONFIGURATION MENU Mon 13:12:57
Shelf 1 Slot 12 PCM 4W AD Ok
-----------------------------------------------------------------------------------------------------------------
Setup Options
-------------------
Channel 1
------------- ------------- --------------
Channel 2
-------------
Node Name:
Channel 3 Channel 4
Circuit Name
Direction
Time Slot (1-24)
Relative Transmit tlp
Relative Receive tlp
...............
—> East
21
+0.0
+0.0
...............
East
22
+0.0
+0.0
.................
East
23
+0.0
+0.0
................
East
24
+0.0
+0.0
±—Change Choice
T—Monitor/Test Menu
<Arrow Keys>—Select Field
D—Default tlp Levels
ESC—Previous Menu
Fig. 10-6. Quad PCM Voice Card Configuration Menu.
169
T1 CHANNEL BANK
It is valuable to have a common variable name be associated with interconnected channels that make up one contiguous service. For example, a T1
Channel Bank is used as an access multiplexer to a long distance carrier for private line (3002) analog modem circuits. At the carrier’s point-of-presence
(POP) the individual time slots (or DS0s) are interconnected to individual private line circuits.
These circuits are assigned circuit numbers by the common carriers. These same numbers can be entered into the circuit name field on this screen for providing a reference.
The fields of this screen are:
• Circuit Name - An 8-character alphanumeric field for establishing a circuit name
• Direction - Selection of which T1 (East or West) the channels are assigned to
• Time slot - Selection of a time slot a channel is assigned to
• Relative transmit and receive gain parameters relative to the stipulated offset for the particular interface
10.5 High Speed Data Channel Configuration
Menu
Use the menu shown in Fig. 10-7 to set up configuration parameters for the HSD card. You can access this menu through the following steps:
1. From the main menu, type in 5 - Configure
Plug-ins, and press the Enter key.
2. Choose a configuration from the list by entering the letters A, B, X, or Y and press the
Enter key. Press Esc to return to the main menu.
3. When the screen for the shelf plug-in assignment menu appears, enter the shelf and slot position you need, such as 1/11. Press the return key.
4. When the HSD configuration menu appears, you can use the arrow keys to scroll through the configuration options. If you want to change an option, press either the + or - to toggle another choice. You can switch to the monitor/test menu from this menu by entering T.
‘A’ active ‘A’ CONFIGURATION MENU
Shelf 1 Slot 4 HSD V35-A Ok
---------------------------------------------------------------------------------------------------------------------------
Setup Options
-------------------
Circuit Name
Channel(s)
--------------
................
Mon 13:12:01
Node Name:
Channel Type (56, 64)
Data Rate (56/64 to 1344/1536)
Direction
DS0 Start Slot (1 to 24)
Clock Source (Int, Ext)
—> 56
200 kbs — 5 DS0 (s)
East
3
Internal
±—Change Choice
T—Monitor/Test Menu
<Arrow Keys>—Select Field
ESC—Previous Menu
Fig. 10-7. High Speed Data Channel Configuration Menu.
170
The fields of this screen are:
• Circuit Name - An 8 character alphanumeric field for establishing a variable name.
• Channel type (56, 64) - This field is used to select the root rate of the data.
• Data rate (56/64 to 1344/1536) - Using the - or
+ key, the operator can step through and assign multiple time slots to a data card. The data rate is the number of time slots assigned times the root rate (channel type 56/64 selected). The highest rate depends on the number of time slots from the DS0 Start Slot to Slot 24. Conflicts with other channels are displayed in the status field on screens “shelf plug-in assignment” and
“time slot assignment.”
• Direction - Selection of which T1 (East or West) the channel or channels are assigned to.
• DS0 Start Slot (1 to 24) - This field selects the start DS0 time slot the high speed data channel is assigned to. The maximum number of DS0 time slots a data channel card can be assigned to is the start DS0 plus all of the DS0s after this to
DS0 24. For example: if the channel type selected is 56, and the DS0 start slot is 23, then the data rates that can be selected (in the data rate field) are 56 and 128 Kbps. Channels must be contiguous, and they will not roll over past channel 24.
• Clock source (Int, Ext) - This field selects between an internal or external clock associated with the data channel’s transmit data. If an external clock is used, it must be synchronous with the T1 Channel Bank’s system clock. The appropriate selection recommended by the standards organizations for data rates over
56/64 Kbps is to use external timing on the high speed data card, with timing looped by the DTE.
This approach maintains the phase relationship between transmit data and the clock used to sample the transmit data.
CHAPTER 10: Configuring and Monitoring Plug-ins
10.6 Subrate DDC Configuration Menu
Use the menu shown in Fig. 10-8 to set up configuration parameters for the SDDC card.
Access this menu with the following steps:
1. From the main menu, type 5 and press the
Enter key.
2. Choose a configuration from the list by entering the letter A, B, X, or Y and press the
Enter key. Press Esc to return to the main menu.
3. When the screen for the configure shelf plugin assignment menu appears, enter the shelf and slot position you need, such as 1/7. Press the Enter key.
4.When the SDDC configuration menu appears, you can use the arrow keys to scroll through the configuration options. If you want to change an option, press either + or - to toggle another choice. You can switch to the monitor/test menu from this menu by entering T.
171
T1 CHANNEL BANK
‘A’ active ‘A’ CONFIGURATION MENU Mon 13:11:39
Shelf 1 Slot 3 SDDC OCU Ok
---------------------------------------------------------------------------------------------------------------------------
Setup Options
-------------------
Channel 1
------------- -------------
Node Name:
Channel 2
Circuit Name
Channel Type
Direction
Time Slot (1-24)
Clock Source (Int, Ext)
Secondary Channel
±—Change Choice
T—Monitor/Test Menu
...............
9600
—> East
2
Internal
Disabled
................
9600
West
2
Internal
Disabled
<Arrow Keys>—Select Field
ESC—Previous Menu
Fig. 10-8. Subrate DDC Configure Menu.
The fields of this screen are:
• Circuit Name - An 8-character alphanumeric field for establishing a circuit name.
• Channel Type - The subrate DDC card operates at 9600 baud only.
• Direction - Selection of which T1 (East or West) the channel is assigned to.
• Time slot - Selection of time slot a channel is assigned to.
• Clock Source - The subrate DDC card can operate on an internal or external clock.
• Secondary Channel - The secondary channel can be enabled or disabled.
10.7 DDC Configuration Menu
Use the menu shown in Fig. 10-9 to set up configuration parameters for the DDC cards. You can access this menu through the following steps:
1. From the main menu, type 5 and press the return key.
2. Choose a configuration from the list by entering the letter A, B, X, or Y and press the return key. Press Esc to return to the main menu.
3. When the screen for the configure shelf plug-in assignment menu appears, enter the shelf and slot position you need, such as 1/7. Press the
Enter key.
4. When the DDC configuration menu appears, you can use the arrow keys to scroll through the configuration options. If you want to change an option, press either + or - to toggle another choice. You can switch to the monitor/test menu from this menu by entering T.
172
CHAPTER 10: Configuring and Monitoring Plug-ins
‘A’ active ‘A’ CONFIGURATION MENU Thu 09:16:50
Shelf 1 Slot 5 DDC V35-A Ok
-----------------------------------------------------------------------------------------------------------------------
Node Name: ..................
Setup Options
-------------------
Channel 1
------------- -------------
Channel 2
Circuit Name
Channel Type (56,64,SW56,SW56—E&M)
Direction
Time Slot (1-24)
Clock Source (Int, Ext)
±—Change Choice
T—Monitor/Test Menu
................
—> 56
East
4
................
56
East
6
Internal Internal
<Arrow Keys>—Select Field
ESC—Previous Menu
Fig. 10-9. DDC Configuration Menu.
The fields of this screen are:
• Circuit Name - An 8-character alphanumeric field for establishing a circuit name.
• Channel Type - The DDC card can operate at
56K, 64K, Sw56K, or Sw56 E&M.
• Direction - Selection of which T1 (East or West) the channel is assigned to.
• Time slot - Selection of time slot a channel is assigned to.
• Clock Source - The DDC card can operate on an internal or external clock.
10.8 Dual Modem Configuration Menu
Use the menu shown in Fig. 10-10 to set up configuration parameters for the DMC card. Follow these steps:
1. From the main menu, type 5 and press the
Enter key.
2. Choose a configuration from the list by entering the letter A, B, X, or Y and press the
Enter key. Press Esc to return to the main menu.
3. When the screen for the configure shelf plug-in assignment menu appears, enter the shelf and slot position you need, such as 1/13. Press the
Enter key.
4.When the DMC configuration menu appears, you can use the arrow keys to scroll through the configuration options. If you want to change an option, press either + or - to toggle another choice. You can switch to the Monitor/Test menu from this menu by entering T.
173
T1 CHANNEL BANK
‘A’ active ‘A’ CONFIGURATION MENU Thu 09:16:50
Shelf 1 Slot 5 DDC V35—A Ok
-----------------------------------------------------------------------------------------------------------------------------------
Node Name: .....................
Setup Options
-------------------
Circuit Name
Channel 1
------------- -------------
Channel 2
...............
................
Direction
Time Slot (1-24)
A/B Signaling
Signaling
—> East
9
Enabled
FXS—LS
Glare Resolution Disabled
±—Change Choice <Arrow Keys>—Select Field
M—Modem Control Menu C—Clone Config Menu
P—Phone/Dial Menu
T—Monitor/Test Menu
S—S-Register Menu
ESC—Previous Menu
West
9
Enabled
FXS—LS
Disabled
Fig. 10-10. Dual Modem Configuration Menu.
The fields of this screen are:
• Circuit Name - An 8-character alphanumeric field for establishing a circuit name.
• Direction - Selection of which T1 (East or West) the channel is assigned to.
• Time slot - Selection of time slot a channel is assigned to.
• A/B Signaling - Enable or disable A/B signaling bits.
• Signaling Type - Select signaling type. (See explanation of the signaling types below.)
• Glare Resolution - Enable or disable glare resolution.
Signaling Types
1. FXS-LS—FXS loop start
2. FXS-GS—FXS ground start
3. FXS-LC—FXS loop start conversion
4. FXS-GC—FXS ground start conversion
5. FXS-ARDLS—FXS auto-ringdown loop start
6. FXS-ARDGS—FXS auto-ringdown ground start
7. Immediate—Immediate start. A method of engaging a trunk or access line in which no start-dial signal is used. The initiating CPE or office simply seizes the trunk or access line and begins sending address bits. This generally is for
MEGACOM options. Because immediate start is not amenable to glare detection, it is never recommended that two-way trunks be provisioned for immediate start in both the inward and outward directions. Immediate start can be used in the inward direction on a two-way trunk with inward dialing suppressed, but the
CPE should be the glare-resolving party. This is common to 56-Kbps trunks; it is unusual on voiceband and voiceband data trunks.
174
8. Wink—Wink start. A method of engaging a trunk or access line to set up a call, performing an integrity check on it, and establishing a proper time to transmit address information. At first glance, wink start may be viewed as a special case of DDSD, where the delay-dial signal is of a short, specified duration. It is a handshaking and timed acknowledgment. After toggling a bit, the central office gives DTMF (dual-tone multifrequency) tones. If a glare lasts too long, the CPE&A considers the off-hook signal to be a wink. Wink start is the preferred method of call control because it inherently offers an integrity check on the trunk and because it provides for rapid detection and resolution of glare on twoway trunks.
9. DDSD—Delay-dial start-dial signaling. A method of engaging a trunk or access line to set up a call, performing an integrity check on it, and establishing a proper time to transmit address information. For example, suppose a call comes into a PBX over a DDSD access line.
The ACP alerts the PBX of the call by transmitting off-hook, i.e., by seizing the access line. The PBX transmits off-hook toward the
ACP until it is ready to receive DID address information. This is the delay-dial signal. When ready to receive address digits, the PBX transmits on-hook. The off-hook to on-hook transition constitutes the start-dial signal and is analogous to dial tone. The ACP, satisfied that the channel and PBX are operational (since it has received the delayed-dial and start-dial signals), transmits the address information. It is possible to mix signaling types on a given trunk
(e.g., DDSD inward with wink start outward), but some signaling combinations are not allowed. DDSD is sometimes referred to as delay-dial with integrity check. DDSD control procedures are similar to those for wink start, except that different timing recommendations apply.
CHAPTER 10: Configuring and Monitoring Plug-ins
10.9 MCC Configuration Menu
Use the menu shown in Fig. 10-11 to display switch settings for the MCC card.
1. From the main menu, type 5 and press the
Enter key.
2. Choose a configuration from the list by entering the letter A, B, X, or Y and press the
Enter key. Press Esc to return to the main menu.
3. When the screen for the shelf plug-in assignment menu appears, enter the shelf and slot position you need, such as 1/1. Press the
Enter key.
4. When the MCC configuration menu appears, you can view the DIP switch configuration.
However, there are no user options available.
To change any switch setting, you must remove the MCC card and change the switch manually.
175
T1 CHANNEL BANK
'A' active
Shelf 1 Slot 1
'A' CONFIGURATION MENU
MCC MCCNET Ok
Thur 16:36:27
Mode Name: Penril
Switch S1
On
Off
1 2 3 4 5 6 7 8
4
On
Off
On
Off
On
5
On
Off
Off
On
On
6
Off
On
On
On
On
MCC Baud Rate
1200 Baud
2400 Baud
4000 Baud
9600 Baud
19200 Baud
Switches 1,2,3,7,8 Not Used
Switch S2
On
Off
On
1 Expansion Shelf
2 MCC Dominant
3 Penril Test
4 Configured CB
5 VT-52 Terminal
6-8 Not Used
1 2 3 4 5 6 7 8
Off
Standard Shelf
Chan Cards Dominant
Normal
Normal Mode
VT-100 Terminal
ESC - Previous Menu
Fig. 10-11. MCC Switch Configuration Menu.
10.10 Four Basic Configurations
Four basic configurations are available for A, B, X, and Y. These configurations toggle with each other, and you rotate to each of them by using the Enter key. Selecting “Config” allows you to edit your choice of configuration.
A and B Configurations
A and B configurations are triggered by the TOD
(time of Day) clock. A could be used for day time operation while B is used for nighttime operation.
If you are using only one configuration, clone that configuration to all the others.
X and Y Configurations
X and Y configurations are configurations that come on line if there is an alarm on the T1 trunk.
X is for the East-side trunk and Y is for the West side trunk.
Possible Configurations
• In a standard one-trunk D4 channel bank (East trunk), configure only A and clone it. You can modify as required.
• If you have two trunks in the D4 channel bank
(East and West trunks), configure A, X, and Y.
• If you have two trunks and you need a day and night configuration as well, then program A, B,
X, and Y.
176
Configuring A and X
For example, if you have one T1 trunk (East side) and no night time configuration, program the T1 in these steps—
1. Enter the configure shelf assignment menus from the main menu by selecting option 5,
“Configure Plug-ins,” and pressing Enter. When you are asked which configuration, type in A.
Proceed with all cards, choosing normal configurations. Exit configuration A.
2. Enter the clone feature. Copy the A configuration to X.
3. Modify X as required.
4. Exit the configuration by answering yes to write the configuration into memory.
CHAPTER 10: Configuring and Monitoring Plug-ins
NOTE
In summary, all configurations are done the same as explained in the steps above. A and B configurations are selected by time. X and Y configurations are failure configurations. You can switch one time only in a failure mode.
10.11 Monitoring the T1 Network
To monitor channel cards and observe all the parameters of the channels, use the monitor shelf plug-in assignment menu. This also allows you to loopback. From the main menu, select 4,
“Monitor/Test Plug-ins” to view the monitor-shelf plug-in assignments. See Fig. 10-12. Press Enter to view the monitor East time slot assignments. See
Fig. 10-13 . By pressing Enter again, you will see the monitor West time slot display. Press Enter again to return to the Monitor Shelf Plug-in Assignments menu. See Fig. 10-12.
‘A’ active MONITOR SHELF PLUG-IN ASSIGNMENTS Mon 13:14:10
Shelf 1 Node Name: Shelf 2
Slot FPA RPA Status Timeslot Slot FPA RPA Status Timeslot
---------------------------------------------------------------------------------------------------------------------
1
2 DDC V35-A Ok
3 SDDC OCU Ok
4 HSD V35-A Ok
5
6
7 T1
8 T1
DSX1 Ok
CSU Ok
9
10
11 DMC RS232 Ok
12 PCM 4W AD Ok
13 HSD RS232 Ok
14 PCM 4W E&M Ok
E 1 W 1
E2 W 2 3
E 3-7
1
2
E Primary
W Primary 8
9
E 9 W 9
10
11
E 21 22 23 24 12
6
7
4
5
W 3
W 4 5 6 7
13
14
Enter Shelf and Slot (1/12, etc.):
ESC—Main menu RETURN—View Timeslot Display
Fig. 10-12. Monitor Shelf Plug-in Menu.
177
T1 CHANNEL BANK
‘A’ active MONITOR EAST T1 TIMESLOT ASSIGNMENTS Mon 13:14:23
Node Name:
TS Name FPA RPA Stat Loc TS Name FPA RPA Stat Loc
---------------------------------------------------------------------------------------------------------------
1 ......... DDC V35-A Ok
2 ......... SDDC OCU Ok
1/02
1/03
13
14
---- Idle ----
---- Idle ----
3 ........
HSD V35-A Ok
4 ........
HSD V35-A Ok
5 ......... HSD V35-A Ok
6 ......... HSD V35-A Ok
1/04
1/04
1/04
1/04
15
16
17
18
---- Idle ----
---- Idle ----
---- Idle ----
---- Idle ----
7 ........
HSD V35-A Ok
8 ---- Idle ----
9 ........
DMC RS232 Ok
10 ---- Idle ----
11
12
---- Idle ----
---- Idle ----
1/04
1/11
19
20
21
22
23
24
.......
.....
.......
.......
---- Idle ----
---- Idle ----
PCM
PCM
PCM
PCM
4W AD Ok
4W AD Ok
4W AD Ok
4W AD Ok
1/12
1/12
1/12
1/12
Enter Timeslot:
ESC—Main Menu
Fig. 10-13. Monitor Timeslot Assignment Menu.
10.12 T1 Card Monitor/Test Menu
Use the menu shown in Fig. 10-14 to monitor and test the T1 card. You can access this menu with the following steps:
1. From the main menu, type 4 and press the
Enter key.
2. When the screen for the Monitor Shelf Plug-in
Assignment menu appears, enter the shelf and slot position you need, such as 1/8. Press the
Enter key.
3. When the T1 Monitor/Test menu appears, you can use the arrow keys to scroll through the test options. If you want to change an option, press the space key for another choice.
178
CHAPTER 10: Configuring and Monitoring Plug-ins
‘A’ active MONITOR/TEST MENU Mon 13:13:58
Shelf 1 Slot 8 T1 CSU Ok
-----------------------------------------------------------------------------------------------------------------
Framing: ESF Direction:
Line Code: B8ZS Pri/Sec:
West
Primary
Online:
Node Name:
Yes Rx B8ZS: No
Red Alarm: Off ES: 0
Timing: Loop LB0 (Tx):
Node Type: End LB0 (Rx):
0.0 dB
0.0 dB
Yellow Alarm: Off SES: 0
Blue Alarm: Off %EFS: 100.00
Test Timer: 00:04:16 00F BPV CRC6 Errors Slips
---------------------------------------------------------------------------------------------------------------------------
Rolling
Filtered at 10 Sec
Sliding 10 Sec Window
0000000000
0000000000
0000000000
0000000000
0000000000
0000000000
0000000000
0000000000
0000000000
0000000000
0000000000
0000000000
Total (24-Hour)
Filtered at 10 Sec (24-Hour)
--------------------------------------------------------------------------------------------------------------------------
Local Loopback —> Off
Remote Loopback Off
0000000000 0000000000 0000000000 0000000000
0000000000 0000000000 0000000000 0000000000
SPACE—Change Choice
R—Reset Card
<Arrow Keys>—Select Field
A,B,X,Y—Configure Menu
Z—Zero Counters ESC—Previous Menu
Fig. 10-14. Monitor/Test Plug-ins Menu.
The screen in Fig. 10-14 displays the status and configuration information for the T1. The following parameters are provided:
• Framing - ESF, D4
• Line code - B8ZS, Bit 7 stuff, AMI
• Timing - Internal/Loop
• Node Type - End/D&I
• Direction - East/West
• Pri/Sec - Primary/Secondary
• LBO (Tx) - Transmit line buildout (feet or dB)
• LBO (Rx) - Receive line buildout (CSU only)
• Online - Yes/No (NOTE: continuously monitored)
• Red alarm - This alarm means that the T1 card is detecting a loss of T1 signal or out-of-frame condition. This also indicates the status of the
Red LED on this T1 card.
• Yellow alarm - This indicates that the T1 card is detecting a yellow alarm pattern being generated from the far end or network. This shows the status of the Yellow LED on this T1 card.
• Blue alarm - This means that the T1 card is detecting a test-on condition from the far end.
• Rx B8ZS - Yes/No indicates B8ZS code words received.
• ES - Count of errored seconds. This parameter resets at midnight.
• SES - Count of severely errored seconds. This parameter resets at midnight.
• % EFS - Percent of error-free seconds since midnight.
179
T1 CHANNEL BANK
• OOF - This field displays the number of out of frames received on a T1 line.
• BPV counter - This field displays the number of bipolar violations received on a T1 line.
• Ft errors/CRC6 - This field displays the number of Ft bit errors when you select D4 framing. It displays the number of CRC6 errors when you select ESF framing.
• Slips - This field displays the number of clock slips received on a T1 line.
• Test timer - The test timer (00:00:00) indicates the time span since the counter was last zeroed.
After 12 midnight, the timer resets to zero. The top numbers of the rolling area are then placed in the 24-Hour section of the screen.
The screen in Fig. 10-15 allows for the following operator actions:
• Local loopback - This field allows you to put a T1
Channel Bank in and out of local loopback by using the space key. Disruptive.
• Remote loopback - Use this to loop the T1 back to the network for a connecting line check.
This is disruptive.
• Reset - Selecting R will reset the card. This is disruptive.
• Zero - Selecting Z resets all counters to zero.
• Configure - Selecting A, B, X, or Y switches to the A, B, X, or Y configure menu for this card.
LED
LAL
ONL
ALM
RED
YEL
RBV
Description
Local loopback
On-line
Alarm
Red alarm
Yellow alarm
Table 10-2. T1 Card LED Indications.
Receive bipolar violation
ON
NA
OFF
Not in loopback
Blinking
Rear card in loopback
T1 logic card is on-line
T1 logic card is off-line
NA
Red or yellow T1 When on-line, alarm (see below) good T1 signal
Loss of T1 line signal or frame sync
REC yellow T1 alarm signal (far end in red)
When on-line,
REC good T1 line signal
NA
When on-line REC unframed all ones
(Blue alarm)
When on-line not When on-line REC a
REC yellow alarm framed all ones
A bipolar No bipolar violation has been violation has detected been detected
LED will blink at rate of deteced BPVs
180
10.13 T1 Card LEDs
When the MCC configures which T1 card is online, and then a front panel switch change is made to switch the one card, the system will default back to the MCC configured state after power is resumed.
The alarm LED will stay on for 12-14 seconds after red alarm clears. This is to ensure that the T1 signal is stable before the T1 Channel Bank releases the channel cards back into service.
BPV Errors
Intentional BPVs—When in B8ZS, the BPVs are not counted.
CHAPTER 10: Configuring and Monitoring Plug-ins
10.14 Quad PCM Voice Card Monitor/Test Menu
Use the menu shown in Fig. 10-15 to monitor and test the quad PCM cards. You can access this menu with the following steps:
1. From the main menu, type 4 and press the
Enter key.
2. When the screen for the Monitor Shelf Plug-in
Assignments menu appears, enter the shelf and slot position you need, such as 1/10. Press the
Enter key.
‘A’ active MONITOR/TEST MENU
Shelf 1 Slot 12 PCM 4W AD Ok
---------------------------------------------------------------------------------------------------------------------------
Setup Options
-------------------
Circuit Name
Direction
Time Slot
Relative Transmit tlp
Relative Receive tlp
Test Options
-----------------
Local Loopback
Channel 1
------------- --------------
...............
East
21
+0.0
+0.0
—> Off
Channel 2
------------- -------------
.................
East
22
+0.0
+0.0
Channel 3
...............
East
23
+0.0
+0.0
Off Off
Mon 13:13:13
Node Name:
Channel 4
...............
East
24
+0.0
+0.0
Off
SPACE—Change Choice
R—Reset Card
<Arrow Keys>—Select Field
A,B,X,Y—Configure Menu
ESC—Previous Menu
Fig. 10-15. Quad PCM Voice Card Monitor Menu.
181
T1 CHANNEL BANK
3. When the QPCM monitor/test menu appears, you can use the arrow keys to scroll through the test options. If you want to change an option, press the space key for another choice.
The fields of this screen are:
• Circuit Name - An 8-character alphanumeric circuit name.
• Direction - Selected T1 line (East or West).
• Time slot - Selected time slot of the channel.
• Relative Transmit tlp - Selected transmit test level point.
• Relative Receive tlp - Selected receive test level point.
The screen in Fig. 10-15 allows for these operator entries:
• Local Loopback - This field allows you to put the selected channel in and out of loopback by using the space key.
• Reset - Selecting R will reset the card. This is disruptive.
• Configure - Selecting A, B, X, or Y switches to the A, B, X, or Y configure menu for this card.
10.15 High Speed Data Channel Monitor/Test
Menu
Use the menu shown in Fig. 10-16 to monitor and test the HSD cards. You can access this menu with the following steps:
1. From the main menu, type 4 and press the
Enter key.
2. When the screen for the Monitor Shelf Plug-in
Assignment menu appears, enter the shelf and slot position you need, such as 1/11. Press the
Enter key.
3. When the HSD monitor/test menu appears, you can use the space key to toggle the loopback state.
‘A’ active MONITOR/TEST MENU
—> Off
Mon 13:15:14
Shelf 1 Slot 4 HSD V35—A Ok
---------------------------------------------------------------------------------------------------------------------------
Setup Options
-------------------
Circuit Name
Channel Type
Data Rate
Direction
DS0 Start Slot
Clock Source
Channel(s)
--------------
.................
56
Node Name:
200 kbs—5 DS0(s)
East
3
Internal
Test Options
----------------
Local Loopback
SPACE—Change Choice
R—Reset Card
A,B,X,Y—Configure Menu
ESC—Previous Menu
Fig. 10-16. 56/64 High-Speed Data Channel Monitor and Test Menu.
182
The screen in Fig. 10-16 displays the monitor and test information for the HSD. The following parameters are provided:
• Circuit Name - An 8-character alphanumeric circuit name.
• Channel Type - 56/64 Kbps.
• Data Rate - 56K - 1344 Kbps.
• Direction - Selected T1 line (East or West).
• DSO Start Slot - Selected start timeslot.
• Clock Source - Selected external clock.
The screen in Fig. 10-16 allows for these operator entries:
• Local Loopback - This field allows you to put the selected channel in and out of loopback using the space key.
• Reset - Selecting R will reset the card. This is disruptive.
• Configure - Selecting A, B, X, or Y switches to the A, B, X, or Y configure menu for this card.
CHAPTER 10: Configuring and Monitoring Plug-ins
10.16 Subrate DDC Monitor/Test Menu
Use the menu shown in Fig. 10-17 to monitor and test the DDC card. You can access this menu through the following steps:
1. From the main menu, type 4 and press the
Enter key.
2. When the screen for the Shelf Plug-in
Assignment menu appears, enter the shelf and slot position you need, such as 1/7. Press the
Enter key.
3. When the SDCC Monitor/Test menu appears, you can use the arrow keys to scroll through the test options. If you want to change an option, press the space key for another choice.
183
T1 CHANNEL BANK
‘A’ active MONITOR/TEST MENU
Shelf 1 Slot 3 SDDC OCU Ok
----------------------------------------------------------------------------------------------------------------------------
Setup Options
-------------------
Circuit Name
Channel Type
Direction
Time Slot
Clock Source
Secondary Channel
Test Options
-----------------
Local Loopback
OCU Loopback
CSU Loopback
DSU Loopback
Quad Loopback
—>
Channel 1
-------------
...............
9600
East
2
Internal
Disabled
Off
Off
Off
Off
Off
Mon 13:15:24
Node Name:
--------------
Channel 2
................
9600
West
2
Internal
Disabled
Off
Off
Off
Off
Off
SPACE—Change Choice
R—Reset Card
<Arrow Keys>—Select Field
A,B,X,Y—Configure Menu
ESC—Previous Menu
Fig. 10-17. Subrate DDC Monitor Menu.
The screen in Fig. 10-17 displays the monitor and test information for the SDDC. The following parameters are provided:
• Circuit Name - An 8-character alphanumeric circuit name.
• Channel Type - The subrate DDC card operates at 9600 baud only.
• Direction - Selected T1 line (East or West).
• Time slot - Selected time slot of the channel.
• Clock Source - Selected external clock.
• Secondary Channel - Selected state enabled or disabled.
See Fig. 10-17 for the following operator entries:
• Local Loopback - This field allows you to put the selected channel in and out of local loopback by using the space key.
• OCU Loopback - This field allows you to put the selected channel in and out of OCU loopback by using the space key.
• CSU Loopback - This field allows you to put the selected channel in and out of CSU loopback by using the space key.
• DSU Loopback - This field allows you to put the selected channel in and out of DSU loopback by using the space key.
• Quad Loopback - This field allows you to put the selected channel in and out of quad loopback by using the space key.
184
• Reset - Selecting R will reset the card. This is disruptive.
• Configure - Selecting A, B, X, or Y switches to the A, B, X, or Y configure menu for this card.
10.17 Dual Data Card Monitor/Test Menu
Use the menu shown in figure 18 to monitor and test the DDC card. You can access this menu through the following steps:
1. From the main menu, type 4 and press the
Enter key.
CHAPTER 10: Configuring and Monitoring Plug-ins
2. When the screen for the Shelf Plug-in
Assignment menu appears, enter the shelf and slot position you need, such as 1/9. Press the
Enter key.
3. When the DCC Monitor/Test menu appears, you can use the arrow keys to scroll through the test options. If you want to change an option, press the space key for another choice.
‘A’ active
Circuit Name
Channel Type
Direction
Time Slot
Clock Source
Test Options
-----------------
MONITOR/TEST MENU
Shelf 1 Slot 2 DDC V35—A Ok
------------------------------------------------------------------------------------------------------------------------------
Setup Options
-------------------
Channel 1
---------------
Channel 2
--------------
..................
.................
56 56
East
1
Internal
West
1
Internal
Local Loopback —> Off Off
Mon 13:15:34
Node Name:
SPACE—Change Choice
R—Reset Card
<Arrow Keys>—Select Field
A,B,X,Y—Configure Menu
ESC—Previous Menu
Fig. 10-18. DDC Monitor/Test Menu.
185
T1 CHANNEL BANK
In Fig. 10-18 these parameters are provided for the DDC:
• Circuit Name - An 8-character alphanumeric circuit name.
• Channel Type - The subrate DDC card operates at 9600 baud only.
• Direction - Selected T1 line (East or West).
• Time slot - Selected time slot of the channel.
• Clock Source - Selected external clock.
The fields of this screen are:
• Local Loopback - This field allows you to put the selected channel in and out of loopback by using the space key.
• Reset - Selecting R will reset the card. This is disruptive.
• Configure - Selecting A, B, X, or Y switches to the A, B, X, or Y configure menu for this card.
10.18 Dual Modem Monitor/Test Menu
Use the menu shown in Fig. 10-19 to monitor and test DMC cards RS-232, RS-530, and V.35. Access the menu with these steps:
1. From the main menu, type 4 and press the
Enter key.
2. When the screen for the Shelf Plug-in
Assignment menu appears, enter the shelf and slot position you want to monitor or test, such as 1/11. Press the Enter key.
‘A’ active
Shelf 1 Slot 11 DMC RS232 Ok
---------------------------------------------------------------------------------------------------------------------------
Setup Options
-------------------
Channel 1
------------- ------------- ----
Channel 2
----
Tx1
----
Rx1
----
Circuit Name
Direction
Time Slot
A/B Signaling
Signaling
Glare Resolution
Modem State
MONITOR/TEST MENU Mon 13:13:27
Node Name:
Tx2 Rx2
.................
East
9
Enabled
...............
West
9
Enabled
FXS-LSFXS-LSCTS 1 RDL 1
Disabled Disabled
Idle Idle
ST 0 SD 1
RD 1 RTS 1
RT 0 TT 1
DSR 1 DTR 1
CTS 1 RDL 1
DCD 1 SS 1
RI 1 ALB 1
SI 0
TM 1
ST 0 SD 1
RD 1 RTS 1
RT 0 TT 1
DSR 1 DTR 1
DCD 1 SS 1
RI 1 ALB 1
SI 0
TM 1
Test Options
-----------------
Local Loopback
Net Loopback
Quad Loopback
External Test
—> Off
Off
Off
Off
Off
Off
Off
NTD 1 NRD 1
Off
SPACE—Change Choice
R—Reset Card
<Arrow Keys>—Select Field
A,B,X,Y—Configure Menu
ESC—Previous Menu
NTD 1 NRD 1
Fig. 10-19. Dual Modem Monitor and Test Menu.
186
3. When the DMC Monitor/Test Menu appears, you can use the arrow keys to scroll through the test options. If you want to change an option, press the space key for another choice.
The screen in Fig. 10-19 displays the monitor and test information for the T1. The following information is displayed:
• Circuit Name - An 8-character alphanumeric field for establishing a circuit name.
• Direction - Selection of which T1 (East or West) the channel is assigned to.
• Time slot - Selection of timeslot a channel is assigned to.
• A/B Signaling - Enable or disable A/B signaling bits.
• Signaling Type - Select signaling type.
• Glare Resolution - Enable or disable glare resolution.
• Modem State - Indicates whether modem is idle, training, or connected.
The screen in Fig. 10-19 allows for the following operator actions:
• Local Loopback - This field allows you to put the selected channel in and out of local loopback by using the space key.
CHAPTER 10: Configuring and Monitoring Plug-ins
• Network Loopback - This field allows you to put the selected channel in and out of network loopback by using the space key.
• Quad Loopback - This field allows you to put the selected channel in and out of quad loopback by using the space key.
• Reset - Selecting R will reset the card. This is disruptive.
• External Test - This field allows you to disable external tests that you have initiated.
• Tx1 Rx1/Tx2 Rx2 - Digital monitoring of signal leads. Tx1 and Rx1 identify signals for channel
1. Tx2 and Rx2 identify signals for channel 2.
• Configure - Selecting A, B, X, or Y switches to the A, B, X, or Y configure menu for this card.
10.19 Alarm Summary
The T1 Channel Bank provides a high degree of intelligence in the network. Depending on the failure, the backups (X or Y configurations) will switch on-line immediately. To discover what happened, you should view the alarm log. Major alarms are listed in Table 10-3, and minor alarms are in Table 10-4. Table 10-3 is a summary of alarm indications which may be found in the status field in figure 14. All alarms for the are listed in Table
10-5 . Call technical support if you need more assistance.
187
T1 CHANNEL BANK
Status Messages
CFY
CLA
CLX
CTN
CRS
ES3
EC3
ES4
BLU
CAX
CAY
CFD
CFD
CFN
CFX
EC4
ES5
EC5
ES6
EC6
BLU
CLA
RED
TPA
YEL
CRS
ES3
ES4
ES5
ES6
ES7
FCM
RCI
RCM
VIO
Table 10-3. Major Alarms
Blue alarm
Clear major alarm
T1 Red alarm
TPA alarm
T1 Yellow alarm
Table 10-4. Minor Alarms.
Card reset
BER 1.0-E03 alarm condition detected
BER 1.0-E04 alarm condition detected
BER 1.0-E05 alarm condition detected
BER 1.0-E06 alarm condition detected
BER 1.0-E07 alarm condition detected
Front card missing
Rear card inserted
Rear card missing
Security violation
Table 10-5. Alarms.
Class
Major
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Mandatory
Major
Mandatory
Mandatory
Minor
Minor
Mandatory
Minor
Mandatory
Minor
Mandatory
Minor
Mandatory
Status
Blue alarm
On-line T1 failed. Configuration switch to X
On-line T1 failed. Configuration switch to Y
Forced configuration switch to B
Time of day configuration switch to A
Forced configuration switch to A
Forced configuration switch to X
Forced configuration switch to Y
Major Alarm Cleared
Lost on-line T1 switch to X
Time of day configuration switch to A
Card reset
BER 1.0-E03 alarm condition detected
BER 1.0-E03 alarm condition cleared
BER 1.0-E04 alarm condition detected
BER 1.0-E04 alarm condition cleared
BER 1.0-E05 alarm condition detected
BER 1.0-E05 alarm condition cleared
BER 1.0-E06 alarm condition detected
BER 1.0-E06 alarm condition cleared
188
Status Messages
RED
RCM
TOF
TON
TPA
VIO
YEL
ES7
EC7
FCM
LSF
LSN
NLF
NLO
RCI
10.20 MCC Monitor/Test Menu
Use the menu shown in Fig. 10-20 to display switch settings for the MCC card.
1. From the main menu, type 4 and press the
Enter key.
2. When the screen for the shelf plug-in assignment menu appears, enter the shelf and slot position you need, such as 1/1. Press the
Enter key.
3. When the MCC Monitor/Test menu appears, you can view the DIP switch configuration.
However, there are no user options available.
To change any switch setting, you must remove the MCC card and change the switch manually.
CHAPTER 10: Configuring and Monitoring Plug-ins
Table 10-5. Alarms (continued).
Class Status
Minor
Mandatory
Minor
Mandatory
Mandatory
Exception
Exception
Minor
Major
Minor
Exception
Exception
Major
Minor
Major
BER 1.0-E07 alarm condition detected
BER 1.0-E07 alarm condition cleared
Front card missing
T1 signal OK
Lost T1 signal
NLOOP cleared
NLOOP detected
Rear card inserted
T1 Red alarm
Rear card missing
Test mode off
Test mode on
TPA alarm
Security violation
T1 Yellow alarm
189
T1 CHANNEL BANK
'A' active
Shelf 1 Slot 1
MONITOR/TEST MENU
MCC MCCNET Ok
Thur 14:27:56
Mode Name: ..............
Switch S1 Switch S2
On On
Off Off
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
4
On
Off
On
Off
On
5
On
Off
Off
On
On
6
Off
On
On
On
On
MCC Baud Rate
1200 Baud
2400 Baud
4000 Baud
9600 Baud
19200 Baud
Switches 1,2,3,7,8 Not Used
ALT -2 FOR HELP ANSI
On
1 Expansion Shelf
2 MCC Dominant
3 Penril Test
4 Configured CB
5 VT-52 Terminal
Off
Standard Shelf
Chan Cards Dominant
Normal
Normal Mode
VT-100 Terminal
6-8 Not Used
ESC - Previous Menu
HDX 9688 N81 LOG CLOSED PRINT OFF OFF-LINE
Fig. 10-20. MCC Monitor/Test Menu.
190
CHAPTER 11: Setting Up System Network Timing Plan
11. Setting Up System Network
Timing Plan
11.1 Signal Flow
Fig. 11-1 is an overview diagram of the signal path flow illustrating both East and West T1 logic card sets. Traffic received on the East T1 is applied to the East T1 (Rx) Bus. This traffic is available for demultiplexing to channel cards assigned to the
East T1. This traffic is also available to continue in the West direction through the E/W, D&I gate.
E
A
S
T
E
A
S
T
W
E
S
T
W
E
S
T
T
X
R
X
T
X
R
X
T1 mux/ demux logic
FIFO
Channel mux/demux logic
Channel mux/demux logic
Rx line
Tx line
East T1
Channel out
Channel in
Channel out
Channel in
Channel
East
Channel
West
D&I gate
T1 mux/ demux logic
FIFO Rx line
Tx line
West T1
Fig. 11-1. Signal Path Flow.
191
T1 CHANNEL BANK
The E/W D&I gate switches between Tx bus and its opposite assigned Rx bus for D&I operation.
Channel input signals are multiplexed onto the
Tx bus and transmitted to the appropriate T1 line through the T1 logic card.
Bus selection and drop-and-insert logic gates are illustrated in Fig. 11-1. The first set of gates select the operating T1 bus (East or West) at the time of configuration. They only change if the logic card is re-configured to the opposite T1 bus. The second gate dynamically switches allowing DS0(s) received from one T1 to be passed directly to the transmit of the opposite T1.
11.2 System Timing Plan
To set up a D&I application that is connected to a
POP, connect the POP to the East side. For a chassis with D&I and East and West T1s, the East direction is always connected to the master clock source.
Figure 11-2 is an overview of the system timing plan.
The T1 Channel Bank uses a synchronous plan.
The East T1 Logic card establishes timing for the entire shelf. Removal of this card will result in the
West card falling back on its local voltage control oscillator (VCO) when it is configured for internal timing.
System clock
Ref
PLL
T1 mux logic
INT
Loop
FIFO
TX
Clock
Tx data
Rx clock
Rx data
RX
East T1
PLL
HIGH SPEED DATA
56/64 N port check
Data
Clock
Data
Clock
System clock
Ref
T1 mux logic
INT
Loop
FIFO
TX
Clock
Tx data
Rx clock
Rx data
RX
Fig. 11-2. System Timing Plan.
SD
EX CK
SD
Channel
East
RD
RC
Channel
West
192
11.3 Choice of Clocks
The T1 Channel Bank allows you to clock from more than one source, either internal or looped. It can use two clock sources: internal and composite.
The standard The T1 Channel Bank uses a stratum
4 built-in internal clock for a reference clock in the network. This oscillator is not stable enough to be used for some purposes, but it could be used by itself if necessary. If you connect the T1 to a CSU in a network, you can derive the clock source from the CSU itself. Most of the time you will use the composite clock source.
CHAPTER 11: Setting Up System Network Timing Plan
11.4 Split Shelf Timing Plan
Fig. 11-3 is an illustration of the timing plan for the split shelf. The backplane arrangement allows you to have separate timing for the East and for the
West. The split shelf timing allows you to process voice and data, but it is not possible to have drop and insert.
System clock
Ref
T1 mux logic
Channel mux/demux logic
Ref clock bus East
Loop
FIFO
Clock
Tx data
Rx clock
Rx data
Slot # 8
TX
RX
Channel out
Channel in
Slots 1-6
Ref clock bus West
Channel mux/demux logic
Channel out
Channel in
Slots 9-14
System clock
Ref
T1 mux logic
Loop
FIFO
Clock
Tx data
Rx clock
Rx data
Slot # 8
TX
RX
Fig. 11-3. Split Shelf Timing Plan.
193
T1 CHANNEL BANK
11.5 Compensating for Jitters and Clock Phase
The receive T1 clock and data signal from the rear plug-in interfaces a 2-frame FIFO buffer that is designed to compensate for jitter and clock phase.
See Fig. 11-4. The output is synchronous with the system clock. Thus, the system clock must be synchronous with the incoming T1 signal. This is accomplished in three ways:
1. The system clock slaves to the receive signal.
2. The far-end unit slave is set up to receive timing.
3. The system is implemented in a controlled synchronous network.
East/
WEST
SEL
EAST
WEST
A&B SIG
EAST
SYSTEM
BUS
INTER-
FACE
LOGIC
TX DATA
TX CK
FIFO
T1
FRAMER
TX
RX
SYS OK REC CLOCK
WEST
T1 CARD
CONTROLLER
WEST EAST
PHASE
LOCK-LOOP
LAL
ONL
ALM
RED
YEL
REP
INT
LOOP
LAL
ON LINE
ALM
EXT ALM
SWC CONTROL
LOOP BACK
CONFIGURATION
Fig. 11-4. Front Plug Assembly T1 Logic Diagram.
194
11.6 Timing Notes for Specific T1 Applications
Example 1: 800 or Long-Distance Service
1. Clocking is provided by the carrier
(Fig. 11-5).
2. Set the T1 Channel Bank to loop timing.
CHAPTER 11: Setting Up System Network Timing Plan
PBX
T1
T1 Channel
Bank
Fig. 11-5. Timing for Long Distance Service.
Carrier LEC or IXC
195
T1 CHANNEL BANK
Example 2: Private Line Drop and Insert
See Fig. 11-6, which shows T1A as the private line that is not being supplied with timing. If you install equipment as shown in Fig. 11-6, it will NOT function.
T1b
D/I
PBX
Data
T1a
T1 Channel
Bank
Private line
(not carrier)
T1 Channel
Bank
D/I T1c
PBX
Data
Fig. 11-6. Installation Will Not Function Properrly.
To ensure that clocks stay in frame, you must place DACS some where in the circuit. See
Fig. 11-7 and follow the steps below to rectify the problem.
196
PBX
Data
West
T1b D/I
T1 Channel
Bank clocking
CHAPTER 11: Setting Up System Network Timing Plan
West
D/I T1c clocking
T1a
East
T1 Channel
Bank
PBX
Fig. 11-7.I nstallation Will Function Properly.
1. Verify that the private line is not being supplied with timing.
2. Place DACS somewhere in the circuit.
3. Set timing on to loop.
4. Set all data timing on (i.e., V.35 card, 4 wire
AD card, etc.) at internal.
5. Set timing on T1b and T1c to loop. T1a should be East side. T1b and T1c should be West side.
Example 3: Network Timing
This application allows for the timing to be provided by the carrier. Set all to loop timing.
All equipment attached to the s receives timing from the ports. See Fig. 11-9. In this figure, the
New York should be a split midplane model.
197
T1 CHANNEL BANK
Sync
Host
Ethernet
Split
Chassis
Workstations
File
Server
Voice
Lines
Router
T1
Channel
Bank
Analog
PBX
LEC
Network
Fax
Fig. 11-8. Timing for Networks.
Fax
Example 4: Point to Point
When you lease a T1 circuit between two locations, timing should be provided by the carrier. See Fig.
11-9 .
Set both Channel Banks for loop timing.
Fax
T1
Channel
Bank
Cluster
Controller
Sync
Terminals
Ethernet
File
Server
Router
Voice
Lines
Workstations
Voice
Lines
198
Florida
CHAPTER 11: Setting Up System Network Timing Plan
New York
PBX
T1
Channel
Bank
Network
Voice Only
Data Only
Voice and Data
Fig. 11-9. Timing for Point-to-Point.
T1
Channel
Bank
199
T1 CHANNEL BANK
12. Testing and Troubleshooting
Once you have configured the T1 Channel Bank, you can now test and monitor the system.
12.1 Verifying Correct Operation
After you turn on the system and it boots up, you know it is on-line when the ONL LED stays on as a solid green light.
To verify operation while disconnected from the
T1 line:
1. Push in the LAL switch button on the front of the T1 card.
2. Hold in the black button until the T1 light starts blinking.
3. Wait 15-20 seconds. You should see all the channel lights come on to verify that they are programmed correctly and that they are working.
NOTE
You can also accomplish the same operation as described above by performing a hard-wire loopback of the
T1 interface—use a loopback plug which jumpers pin 1 to pin 3 and pin 9 to pin 11 of the T1 rear plug assembly connector.
12.2 Changing a Configuration
You can only change configurations by escaping out of the shelf plug-in assignment/time slot assignment menu to the main menu using the
Esc key.
1. You can configure by selecting (5) Configure
Plug-ins from the main menu.
2. After you make your edits, use the Esc key to return to the main menu. At this time the MCC asks if you want to write these to EEPROM
(Y/N). If you type Y, then the plug-in units are changed to the new configuration just edited. If you answer N, no changes will be written to the
EEPROMs.
NOTE
When a card fails or is replaced into the same slot, no reconfiguration is required.
If you look in the back of the chassis, it is easy to see if the cards are placed correctly by looking at the LEDs.
• If the green LED comes on and stays on, it means that the back card matches the front card.
• If you put a rear card in the wrong slot, the green LED will blink.
• If you put a rear card in a slot where there is no front card installed, the LED will be off.
200
12.3 Configuration Conflicts
When there is a configuration conflict, a warning message is displayed in the status field of the assignment menus. Also, the MCC will not permit the conflict to be initiated and the old configuration will remain the active one.
Conflicts are:
• Two channels assigned to the same time slot.
• Two T1 cards assigned to the same status
(primary or secondary).
• Two T1 cards on line simultaneously assigned to the same T1.
CHAPTER 12: Testing and Troubleshooting
12.4 Troubleshooting Alarms
If alarms come on, what you do next often depends whether your setup is point-to-point or whether you are connected to a long-distance carrier (POP).
If Connected to a Long-Distance Carrier
• Check to ensure the timing is set to the specs the carrier has given to you.
• If not, work with the long-distance carrier’s technician to ensure that the timing is set correctly.
Verifying Presence of a Bad T1 Card
1. If the alarm does not go away in 15-20 seconds and the solid green light does not come on, then do a hardwire loopback test on the T1 card by shorting pins 1 and 3 together and pins 9 and
11 together on the back of the T1. There is also a loopback test provided by the T1 card itself.
2. If you put the same plug on the CSU (1 and 3 and 9 and 11), you can loop the CSU back. See figure 1.
3. Put the remote CSU in loopback to verify the circuit and equipment.
4. Repeat steps 1-3 from the distant end mux.
MT400A
Step 1
CSU
Step 2
T1 circuit
Looped back
CSU
Step 3
Looped back
MT400A
Step 4
Fig. 12-1. Direction of Loopbacks.
201
T1 CHANNEL BANK
12.5 Testing for Tone Levels
During installation, it is necessary to test for adjusting tone levels and losses. Use the levels shown in Fig. 12-2.
+3 dBm TX
FXS
-9 dBm RX
Typical PBX
+3 dBm out
-3 dBm in
T1 RX -3dBm
FXO
0 dBm TX +3dBm
FCC Part 68.308
If not natural voice, then:
Lines are -9 dBm out
Trunks are -15 dBm out
Fig. 12-2. PBX Tone Levels.
12.6 Testing the E&M Cards
This test procedure is for the 4-wire E&M. Use this for the following PBXs: Horizon, Dimension,
System 85, and System 75. While testing the 4-wire
E&M from a PBX, keep in mind that some PBXs hunt sequentially for a trunk, and others do a random selection. This means that you could dial the trunk group (4-wire E&M) from the PBX, but it might not be the first trunk in the group even if no one else is using the PBX. You might have to look for the trunk while you are testing.
PBXs Direction of Signals
• M — out of the PBX
• E — into the PBX
• T&R — into the PBX
• T1&R1 — out of the PBX
4-Wire E&M Card in the T1 Channel Bank
• M — into the channel card
• E — out of the channel card
• T&R — into the channel card
• T1&R1 — out of the channel card
202
3
4
1
2
E lead
M lead
T1
R
CHAPTER 12: Testing and Troubleshooting
Table 12-1. Pinouts.
7
8
5
6
T
R1
EG
MB
Test Procedure
To test the function of the E&M lead from the PBX, follow these steps—
1. Disconnect the E&M leads from the PBX and the channel bank 4-wire E&M card.
2. Place a voltmeter from the M lead of the PBX to the ground. With the PBX trunk at idle, there should be no reading. PBX places the M lead at ground.
3, When the PBX seizes the E&M trunk, the M lead from the PBX should go to -48 VDC.
4. The M LED on the PBX card should come on when the trunk is seized.
5. With the E&M leads connected to the channel bank at both ends (when the M LED comes on at the side where the trunk is seized), the E LED will come on at the far end.
6. Notice that the when the trunk is idle, the E lead will be open.
7. Notice that when the trunk is seized at A, the E lead at B will go from open to ground.
203
T1 CHANNEL BANK
000
T1 CHANNEL BANK
13. Post-Installation
Routine Maintenance
Once your T1 Channel Bank has been installed, you only need to give it a periodic cleaning. Use a damp lint-free cloth to remove smudges, finger prints, or dust that accumulates on the case or face-plates.
If you do not sign up for a maintenance contract for the hardware, then keep at least one extra T1 card on the premises as a spare. You must turn off the system in order to pull the T1 card out. The T1 card supplies the clock to other cards in the system, and unless the T1 is on and functioning properly, the others will not function properly. After you change the T1 card, turn the system on again.
You can change the voice and data cards with the system still running. Removal and installation of channel cards can cause noise on other circuits.
Select your time to replace cards accordingly.
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Appendix A: Glossary
APPENDIX A: Glossary
A
Access rights of 1 — Access rights for monitoring only.
AD — Analog to Digital
Address — A set of numbers that uniquely identifies something such as a workstation in a LAN, a packet of data traveling through a network, a location in computer memory. The location of a terminal, a peripheral device, a node, or any other unit in a network.
AGC — Automatic Gain Control
Aggregate input — The sum of all data rates of the terminals (or computer ports) connected to a multiplexor.
AMI (Alternate mark inversion) — Every other 1 gets inverted in a bipolar stream.
Analog — A varying, non-discrete function, usually applied to electronic signals. An analog function can take any value within a given range, and changes value with a smooth transition. It is the opposite of a digital signal, which jumps from one discrete value to another.
ANSI (American National Standards Institute) —
A voluntary organization that helps set standards and also helps the U.S. in the International
Standards Organization (ISO).
ASCII (American Standard Code for Information
Interchange) — A way of encoding characters into binary (on/off) bits. A 7-bit (plus parity) code used for data transmission, established to maintain compatibility between data services.
Asynchronous — A method of transmitting data, a low-cost alternative to synchronous communications because it does not require the sender and the receiver to each have a “clock” to time each other to stay in “sync.” Each character is individually synchronized, usually by the start and stop bits. The timing information is in the transmitted character, rather than by a separate clocking signal.
ASDS (ACCUNET Spectrum of Digital Services) —
A fractional T1 service tariffed by AT&T.
AT command set — The auto-dialing comand-set standard for most Bell 212A full-duplex dialup modems. The command set refers to a specific set of ASCII characters that may be sent to the modem for control purposes. An ASCII “AT” must precede each command.
Attenuation — The difference between transmitted and received power due to loss through equipment, lines, or other transmission devices. Usually attenuation is inherent to a transmission line, because of impedance factors. A certain amount of loss is usually expected (and sometimes required) by error-correcting circuitry in devices such as modems. If loss is not present, it can be inserted.
B
Bandwidth — The difference, expressed in Hertz
(Hz or cycle per second), between the highest and the lowest frequencies of a transmission channel.
The range of frequencies that can pass over a given circuit. Usually, the greater the bandwidth, the more information that can be sent through the circuit at a given amount of time.
BERT (Bit Error Rate/Ratio Testing) — Testing a data line with a pattern of bits that is compared before and after transmission.
Binary digit (Bit) — A numeral within the binary number system. The Binary Digit may be at either of two states: zero (0) or one (1), on or off, high or low, yes or no.
Bit rate — The rate at which data bits are transmitted over a communication path, normally expressed in bits per second (bps); not to be confused with the data signaling rate (baud), which measures the rate of signal changes.
Bit 7 stuff — In line code, B7ZS inserts a 1 in bit 7 of a voice time slot that contains all zeros in bits 1-8.
bps (bits per second) — The basic unit of data communications rate measurement.
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T1 CHANNEL BANK
BER (Bit Error Rate) — The ratio of incorrectly received data (bits) to the total amount of data transmitted.
BG — Battery ground.
BPV — Bipolar violation. Two successive bits with the same polarity.
Bus — Connective link between multiple processing sites, connected in parallel and shared by users; sites can transmit data only one way at a time.
Involves some sort of contention-control mechanism for accessing bus transmission medium.
Bypass D&I — A relay that connects East and West span together if the chassis fails.
Byte — A set of contiguous bits constituting a discrete item of information. Usually six or eight bits long.
B8ZS (Bipolar 8 Zero Substitution) — In line code,
B8ZS transmits a specified BPV code on the T1 line if 8 zeros are detected. This is referred to as a clear channel capability.
C
Carrier — Public/common provider of communications facilities to provide transmission of voice and data from one point to another over a telecommunications network. Examples: AT&T,
Sprint ® , MCI ® .
CCITT (Comite Consultatif International
Telegraphique et Telephonique) — International consultative commmittee for telephone and telegraph standards, based in Geneva, Switzerland.
CGA (Carrier Group Alarm)
Channel — 56 or 64 Kbps PCM.
Channel bank — Communication equipment used for multiplexing voice-grade channels into a digial transmission signal (typically, 24 channels in US, 30 in Europe).
Character parity — Adding overhead bit to a character code to provide error-checking.
Circuit — The complete electrical path between terminals over which telecommunications are provided. A network of circuit elements (logic gates, transistors, capacitors, etc.) used to perform a specific function.
Clear channel capability — Ability to use all
64 kbps or N x 64 user data. This requires ESF framing and B8ZS line coding.
Clock — A device for timing events. In data communications, you need a clock to control the timing bits sent in a data stream and to control the timing of the sampling bits received in a data stream.
Cloud — The public network, called a cloud because a user can connect at one point on it and expect data/voice input to pass through to the other side and merge in the proper sequence and format.
CODEC (Coder/Decoder) — An integrated circuit that performs specific analog-to-digital conversion.
Communications facility — Communications circuit usually provided by the common carrier.
COM Port — The interface through which the computer connects to its communication channel.
Time-sharing computers can be equipped with a variety of ports that matches the various communications services and connected terminal devices.
Composite lin k—The line of circuit connecting a pair of multiplexers or concentrator; the circuit carrying the multiplexed data.
CPU —Central Processing Unit
CRC— Cyclic Redundancy Check
CSU (Channel Service Unit) — A component of customer premises equipment (CPE) used to terminate a digital circuit, such as DDS or T1, at the customer site. Performs certain line-conditioning functions, ensures network compliance per FCC rules, and responds to loopback commands from central office.
206
CTS (Clear to send —An RS-232 signal generated by the DCE indicating that the DCE (modem or mux) is ready to transmit data.
D
D4 — T1 framing technique dividing T1 into 24 channels, a D4 frame being 192 bits X 8000 =
64 Kbps, or a DS0. D4 allows continuous monitoring and non-destructive diagnostic framing to be implemented by the carrier.
DACS (Digital Access and Cross-connect System) —
A digital cross-connect switch.
Data — Digitally represented information, which includes voice, text, facsimile, and video.
Data link — A connection between two computers over a phone line.
Data rate — The maximum number of bits or information that can be transmitted per second.
Data Set Ready — RS-232 control signal indicates that a modem is ready to transmit data.
DCD —Data Carrier Detect
DCE (Data Communication Equipment) — The equipment that helps the DTE communicate over the network by providing the necessary coding or conversions. It establishes, maintains, and terminates the connection in a data conversation.
DDS (Dataphone Digital Service) — A trademark of
AT&T to identify a private-line service for digital data communications.
Dedicated line — A leased telephone line, reserved for the exclusive use of one customer.
Digital Data Service Unit (DSU) — A device used for the connection of a high-speed data line with a common carrier line.
Diagnostics — Tests used to detect malfunctions in a system or component. Diagnostics aid the troubleshooter in locating and correcting specific problems.
APPENDIX A: Glossary
Digital — Encoded as either a binary 1 or 0. In data communications, the description of the binary output of computer or terminal. Muxes or modems convert the digital signals into waves for transmission over conventional telephone lines.
Digital loopback — Technique for testing digital processing circuitry of a communications device.
May be initiated locally or remotely via a telecommunications circuit. Device being tested will echo back a received test message after first decoding and then re-encoding in the results of which are compared with the original message.
DLF (Data Link Facility) — 40,000 bps bandwidth, a part of ESF type framing.
DS1 — A level 1 digital signal, 1.544 Mbps.
DS0 — Individual time slots that are assigned circuit numbers by the common carriers. A level O digital signal (64 Kbps); for example, a D4.
DSR— Data Set Ready
DSU— Digital Service Unit/Data Service Unit
DSX— Digital Signal Cross connect
DTE (Data Terminal Equipment) —The equipment at the end points of a communication link.
Examples: a computer, a printer, a modem, a teletype, or a PBX.
DTR (Data Terminal Ready) — An RS-232 interface control signal which indicates that the terminals are ready for transmission.
Dumb terminal — A workstation that does not have internal (or local) processing/storage and cannot do much with the data you give it. It is usually just a keyboard and a screen. Typically does not use a data-transmission protocol, and sends one character at a time.
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T1 CHANNEL BANK
E
Encoding/decoding — Process of reforming information into a format suitable for transmission, and recovering it after transmission. For PCM, the generation of digital signals to represent quantized samples and the subsequent reverse process.
EPROM (Erasable Programable Read-Only
Memory) — A computer chip or set of chips designed to store data (normally instruction code) that is frequently used. Memory that is initially programmed by the manufacturer. These chips do not lose their memory when the electricity is turned off. However, if they need new memory, you often have to return them to the factory to be reprogrammed.
EEPROM— Electrically Erasable Programmable
Read-Only Memory
E&M (Ear and mouth) — The receive and transmit leads usually used between PBXs to signal on-hook and off-hook conditions. 2-state voltage.
EIA (Electronic Industries Association) — U.S.
trade organization that issues its own standards and contributes to ANSI. It is responsible for the development and maintenance of industry standards for the interface between data processing machines and data-communications equipment.
ESD —Electrostatic Discharge
ESF (Extended Superframe Format or Extended
Superframe ) — This framing pattern indentifies a
24-frame sequence. This allows terminal equipment to rob bit 8 in frames 1, 6, 12, and 18 for telephone signaling information. The frame pattern is further time divided into a framing sequence pattern. ESF has a 4000-bps data channel (data-link facility).
Error rate — The ratio of incorrectly received data
(bits, elements, characters, or blocks) to the total amount of data transmitted.
EXT CK — External clock.
F
Facility — A communications link or circuit.
FDX (full duplex) — Simultaneous communication between two points in both directions.
FIFO (First In First Out) — Mode of access in computer memory.
Four-wire circuit — A transmissions path which employs two separate electrical paths: one receiving and one transmitting.
Fractional T1 service — This service uses the N x
DS0 portion of the T1 bandwidth, a service where the carrier only charges for the 64 Kbps resources used between cities. Examples: ASDS (ACCUNET
Spectrum of Digital Services), tarriffed by AT&T.
Frame — A group of bits sent over a communications channel, usually containing its own control information, including address and error detection. The exact size and frame compositon depends on the protocol used.
Frequency — The number of times an elecromagnetic signal repeats an identical cycle in a unit of time, usually one second. One Hertz (Hz) is one cycle per second; a MHz is one million cycle per second.
Full duplex — Simultaneous two-way, independent communications in both directions.
FXO (Foreign Exchange Office) — Office-end applications.
FXS (Foreign Exchange Subscriber) — Station-end applications.
FX (Foreign exchange) — Circuits.
FPA (Front Plug Assembly) — Front card for the channel bank.
208
G
Glare — Two ends of a trunk seizing at the same time.
Groom — Efficient allocation/assignment of DS0s on the T1 by combining voice and data together to send on the same T1.
H
Half duplex (HDX) — Communication line using protocol capable of transmitting in either direction, but only one direction at a time.
Handshaking — Also known as Control Signal
Sequencing, a procedure performed by DCEs or
DTEs to verify that communications have been established and can proceed. There is also an alarm handshaking process on the T1.
HD2, 3, 4, etc — Header 2, 3, 4, etc.
Hertz — Synonymous with cycles per second: a unit of frequency that tells the number of cycles or complete waves that pass a reference point per second. One Hertz (Hz) is equal to 1 cycle per second.
High frequencies — Frequencies from 160 MHz to
400 MHz, designated for the forward direction in a mid-split system.
HSDC —High speed data channel
I
IADS —International ACCUNET Digital Service
IBR (Intermediate Bit Rate) — 64, 128, 256, 384,
512, or 768 Kbps.
IEEE (Institute of Electrical and Electronic
Engineers) — An international professional society based in New York that issues its own standards and is a member of ANSI and ISO.
Interleaving — To arrange parts of one sequence of things or events so that they alternate with parts of one or more sequences of things or events in which each sequence retains its own identity.
Intelligent terminal — A programmable terminal.
IOC —Inter-office channel
APPENDIX A: Glossary
I/O —Input/Output
ISDN —Integrated Service Data Network
ISO (International Standards Organization) — An organization based in Geneva, Switzerland, that creates, controls, and publishes standards.
ISO OSI (International Standards Organization’s architecture for Open Systems Interconnection) —
A scheme for a universal standard architecture and protocol.
ITDM — Intelligent Time-Division Multiplexor. A multiplexer that assigns time slots on demand rather than on a fixed subchannel-scanning basis.
IXC —Inter-exchange carrier
J
Jitter — Analog-communication line distortion caused by a signal’s variation from its reference timing position, which can cause data-transmission errors, particularly at high speeds. This variation can be in amplitude, time, frequency, or phase.
JP1— Jumper Plug 1
K
K — One kilobyte, or 1024 bytes.
Kbps (Kilobits per second) — 1000 bits per second, a basic unit of measurement of data transmission speed.
KTU (Key Telephone Unit) — Telco utility standard shelf spacing. The spacing between the holes on the rack bars that is reserved for future telephone equipment.
L
LAL —Local Analog Loopback
LAN (Local Area Network) — A network to interconnect a variety of data terminal equipment within a limited geographical area. LANs do not use common carrier circuits ,although they may have gateways or bridges to other public and/or private networks.
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T1 CHANNEL BANK
Latched status — An alarm state noted on the screen. Once the operator has acknowledged the alarm or it has cleared on its own, a key must be pressed to unlatch it and for the OK status to reappear on the screen.
LEC ( Local Exchange Carrier).
LED (Light-Emitting Diode) — A semiconductor device that emits light when current flows through it.
LDL (Local Digital Loopback) — A circuit that provides a loopback in both the T1 and the channel interface direction.
LL (Local Loopback) — A loopback performed by the locally installed equipment.
Logical port — Anything that connects to or can be connected to, such as a trunk line, an asychronous port, a path name, or a character string.
Loopback — A type of diagnostic test in which the transmitted signal is returned to the sending device after it passes through a data-communications link or network. This permits a built-in diagnostic circuit to compare the returned signal with the transmitted signal. If something is wrong with your equipment, you can do loopbacks excluding one piece of equipment after another until you logically figure out what is malfunctioning. Loopbacks can be performed on data in either an analog or a digital state.
Loopback tests — A test procedure in which signals are looped from a test center through a multiplexor, modem, or loopback switch and back to the test center for measurement.
LSO —Local Servicing Office
M
m (Milli) — Designation for one thousandth.
MB—Megabyte — 1,048,576 bytes or 1024 KB, a basic unit of measurement of mass storage.
Master clock — The source of timing signals, or the signals themselves, which all network stations use for synchronization.
Mbps (Megabits per second) —Millions of bits per second; measure of the signaling rate of a data link.
MCC (Monitor, Control, Configure) — The network managment card that works with the T1
Channel Bank..
MEGACOM — AT&T MEGACOM 800 service for large WATS customers.
MNP (Microcom Networking Protocol) — An errorcorrecting protocol for modems. Operates only point-to-point and does not have easy connections to X.25 and ISDN technology.
Modulation — The process by which a characteristic of one kind of wave is varied in accordance to another wave or signal as in multiplexors or modems. This equipment transforms computer signals into waves that are compatible with other communications equipment. Examples: AM
(amplitude modulation), FM (frequency modulation), PCM (pulse code modulation).
Multiplex — To interleave or simultaneously transmit two or more messages on a single channel.
It is the use of a common physical channel in order to make two or more logical channels or by separating them by time, accomplished by several methods such as TDM, STDM, or FDM.
Multiplexed channel — A communication line equipped with mulitplexors at each end. Also called a multiplexor link.
Multipoint — Network configuration in which several stations are interconnected.
Mux — Common term for multiplexor. The equipment that interleaves two or more data streams on to a single transmission path (See
TDM).
N
Network — A series of points, nodes, computers, terminals, and communications facilities connected by communications channels.
NMS — Network management system or network management software system, used to configure, control, and monitor networks and connected devices, usually from a single location.
210
Node — A point where one or more functional units interconnect transmission lines . A physical device that allows for the transmission of data within a network. Typically includes host processors, communications controllers, cluster controllers, and terminals.
O
OCC — Other Common Carrier or a company that provides long-distance services other than AT&T.
OPX— Off-Premises Extensions
P
Packet — A group of data with individual address and control signals in a specified format transferred as a whole within the data network.
Pad — A resistance network assigned the value needed to provide the necessary loss to meet a required transmission level.
PAD (Packet Assembler/Disassembler) — A network interface device that allows multiple asynchronous and/or synchronous terminals or host-computer ports to interface to an packetswitching network. A protocol-conversion device that allows user terminals not equipped for packet switching to communicate over an X.25-based channel.
Parity checking — Parity may be even, odd, or none. This is a method of error checking: the receiving and sending T1 device decides to send with either even or odd (or no) parity. For example, ineven parity, every byte will have an even number of “1’s” in it. The parity bit is added or not added to every byte to make sure the addition is always the same. The receiving T1 device can then look at the parity bit along with the rest of the byte, count the number of “1’s,” and detect an error if that number is not even. It is not a foolproof method of detection, but it is better than no method at all.
PABX (Private Automatic Branch Exchange) —
Equipment used for switching telephone calls within a business and from the site to outside lines.
It is also used for low-speed transmission of data in addition to voice.
APPENDIX A: Glossary
PBX (Private Branch Exchange) — A user-owned telephone exchange.
PCM (Pulse Code Modification) — A common way of converting an analog signal, such as from a telephone conversation, to a digital signal. The modulating signal is sampled and coded so that each element of the information consists of different kinds and numbers of spaces and pulses.
PCM samples the voice 8000 times a second and measures each sample in 8 bits. Thus, it encodes one second of voice conversation into 64,000 bits (8 x 8000).
PDN —Public Data Network.
Pipe — A physical T1 communications facility.
Point-to-Point —Connecting two (and only two) nodes without passing through an intermediate node.
POP (Point of Presence) — The point within a local telephone company where the local telephone company terminates subscriber’s circuits for leasedline or long-distance dialup circuits.
Port — A point of access into a computer, network, or other electronic device. The entrance or physical access point to a computer, multiplexer, device, or network where signals may be extracted, supplied, or observed. Common ports are the serial and parallel ports on the back of most PCs.
PROM— Programmable Read-Only Memory.
Propagation delay — The time necessary for a signal to travel from one point on a circuit to another.
Protocol — A set of rules for communicating between computers to make sense of the stream of incoming bits. These hardware and software rules govern timing, format, sequencing, and error control. The key elements of protocol are syntax, timing, and semantics. Timing works with speed matching so a computer with a 9600 bps port can talk to one with a 1200 bps port, and it makes proper sequence of data if it arrives out of order.
Syntax specifies the signal levels to be used and the format in which the data is to be sent. Semantics includes the information you need for coordinating among machines and for data handling.
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T1 CHANNEL BANK
Public network — Generally, a network operated by common carriers or telecommunications administrations for the provision of circuit-switched, packet-switched, and leased line circuits to the public. (See Cloud.)
Punchdown — A tool used to cut down through the insulation and get a wire attached to the block.
R
RBPV —Receive Bi-polar violation
Redundancy — 1) The part of the system that duplicates the essential tasks to take over in case the original fails. 2) A communications facility in which there is a spare back-up device for each important component of the system. 3) The part of a message or system that you can discard without losing the esssential information or service.
Remote node — A piece of telecommunications equipment connected to a central hub or a central office.
RI (Ring Indicator) — A modem interface signal defined in RS-232 that indicates to the attached
DTE that an incoming call is present. The call is answered when the terminal turns on DTR.
RJ-11 — The standard telephone company 4-wire or
6-wire connector for telephone and telecommuncation equipment (handsets and datasets). Also modular connector.
RJ-45 — An eight-contact connector, often found on the 4-wire E&M card and others.
RMA — Return Material Authorization number
Root rate — 56N or 64N x the number of time slots.
RPA (Rear Plug Assembly) — A rear card for the channel bank.
RS-232C — A technical specification published by the EIA that specifies the mechanical and electrical characteristics of the interface for connecting DTE and DCE. It defines interface circuit functions and their corresponding connector pin assignments.
The traditional RS-232 plug has 25 pins. The standard applies to both synchronous and asynchronous binary data transmission.
RTS —Request To Send
RU — Rack unit with standard size of 1 3/4” per
RU. This rack spacing is the space between two screw holes.
Rx — Receiving.
RxD— Receive Data
S
Serial RS-232 data link — Conforms to industry standards as listed from AT&T publication RS-232.
Serial transmission that sends one bit at a time on a channel.
SDN —Software Defined Network
SINA —Static Integrated Network Access
SDM —Subrate Data Multiplexing
SDM/SRDM —SubRate Digital Mux
S/N ratio (Signal-to-Noise ratio) — The relative power levels of a signal and noise on a communication line, expressed in decibels.
STDM (Statistical Time Division Multiplexor) —
An intelligent time-division multiplexer that uses microprocessors and a memory to multiplex data only from active channels. Also called a stat mux or a statisical multiplexor.
Superframe — A D4 frame standard or pattern that identifies a 12-frame sequence. This allows the terminal equipment to rob bit 8 in frames 1 and 6 of voice channels to transmit telephone signaling information.
212
Synchronous (sync) transmission — A transmission that uses a constant time between successive bits, characters, or events. This is achieved by the sharing of a single clock. Each end of the transmission synchronizes itself with the use of clocks and information sent along with the transmitted data and both ends operate continously at the same frequency.
T
T1 carrier — A digital transmission system developed by AT&T which sends information at
1.544 Mbps, allowing you to simultaneously transmit
24 voice conversations, each encoded at 64,000 bits per second. Many PBXs can connect directly to T1 lines.
TDM (Time Division Multiplexing) — A method of using channel capacity efficiently in which each node is allotted a small time interval, in turns, during which it may transmit a message or a portion of a message. The messages of many nodes are interleaved for transmission and then demultiplexed into their proper order at the receiving end. In TDM, users of a single channel take turns transmitting over the channel with digital signals.
Telco (Telephone Company) — A generic term for the “Telephone Company” and its equipment and networks. Also the Telephone Central Office.
Telecommunications — Any transmission or reception of signals, signs, writing, images, and sounds; or intelligence of any nature by wire, radio, visual, or other electronic media.
Terminal — A workstation designed to send or receive data that allows access to the main computer, multiplexor, or communications device.
It is a point in the network at which data can either enter or leave. Examples are personal computers, modems, telephones, and dumb terminals. The terminal usually comprises the following functional units: control logic, buffer store, and input or output device/s, or computer/s.
APPENDIX A: Glossary
Throughput — The speed at which work performed by a computer or data is passed through a network.
The total measure of useful information processed or communicated during a specific time period.
Expressed in bits per second or packets per second.
Tie line — Leased or private dedicated telephone circuit provided by common carriers that links two points together without using the switched telephone network.
Tip and Ring — Two conductors of a cable pair used to carry audio and signaling information between the central office and a subscriber.
TLP —Transmission Level Point
TPA (Transmission Program Alarm) — A carrier group alarm.
Timing plan — The plan implemented has the timing selection for all nodes in a network of multiplexers.
Trunk — The facility between customer premise and LEC central office and between carrier central offices.
TS1, TS2 —A type of connectorization to the T1
Channel Bank utility shelf.
TxD— Transmit Data.
V
V.35 — Data-transmission specifications for a wideband modem used widely in North America at the 100-kHz bandwidth. It has options for the transmisson of voice pulse-code modulation signals through the single-sideband amplitude- modulation technique. V.35 operates at full duplex with a 4800bps line speed, leased lines, and scrambler.
VCO —Voltage Control Oscillator.
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T1 CHANNEL BANK
X
X.21 — CCITT designation assigned to data transmission over public data networks to interface between DTEs and DCEs for synchronous operation.
X.25
— The protocol interface between user DTEs and packet-switching DCEs.
X.25 pad — A device that permits communication between non-X.25 devices and the devices in an
X.25 network.
214
APPENDIX B: Site Survey
Appendix B: Site Survey
This site survey is the first step in the installation of a T1 Channel Bank. The site survey contains detailed questions regarding your installation.
Completing this survey will make the installation much easier and more efficient.
Site Survey
Name of Organization ____________________
Completed by _______________________
Date ____________
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T1 CHANNEL BANK
To install the T1 Channel Bank,you need the following information:
• A system diagram or drawing of the network
• A written description of the application
• A description of the rack or cabinet to house the equipment
• Power locations and amount of current available
• Grounding point near the equipment installation
• Cabling information, who supplies what
• Space available around the equipment
• Environment, air conditioning or ambient temperature
• Carrier or private network
• Type of line coding and framing
System Diagram
Include a detailed diagram of the proposed network. Show the following:
• All nodes
• Type of chassis at each node (expansion, split midplane)
• Kind and number of channel cards in each chassis
• Equipment to be connected to channels (CPU, telephone, PBX)
• Speed of each channel (V.35 @ 38.4 Kbps)
• Number of channels on each T1 trunk
• Type of CSU (internal or external)
Please include any information on the network diagram that may be helpful.
216
Application Description
Sketch your application here.
APPENDIX B: Site Survey
217
T1 CHANNEL BANK
Describe your application on the previous page.
Include any information that may be helpful. Please answer the following questions in your description:
• Briefly, how will your organization use the channel bank? (for example: OPX’s, voice only, for LAN bridge traffic)
• How many channels do you need at each site?
• What type of equipment will be connected to the channel cards?
• How will you use the MCC at this site?
• How many configurations are required (day and night)?
• What if the site uses two T1s to the carrier. Will you set up priority channels?
• Will you use redundant power or redundant T1 logic?
• Is the power requirement AC or DC?
• What type of PBX, if any, is being used?
• Will the connections be to a punch down board, or will they be direct?
• What will the levels at each channel be? (0,0 or
+7,-16?)
Rack Mount or Cabinet Description
The T1 Channel Bank can be mounted in a front support rack or center gravity rack. The ears on the chassis can be moved. Other considerations—
• If the T1 Channel Bank is to be placed in a cabinet, the depth required is at least 30 inches.
• If the utility shelf is used for redundant power, it can be mounted above or below the 14-slot chassis.
• If you use an expansion chassis, be sure to use the UL ® straps provided.
• The UL ® chassis is only required on the bottom of the lineup whether it is in a rack or a cabinet.
NOTE
The T1 Channel Bank is made for a 19inch rack or cabinet. 23-inch racks or cabinets need special brackets supplied by the factory.
To provide a specific mounting description, complete the form on the following page.
218
Rack Mount or Cabinet Description
Put a check mark to the left of each item which describes your mounting plan—
Cabinet height
Cabinet width
___ 19”___ 24”
Side panels
___ Right side___ Left side
Top panel
___ Solid___ Louvered___ Modified for fan___
Modified for cables
Optional equipment
___ Plexiglas ® door___ Casters___ Perforated shelf___ Additional power strips _________
Additional mounting channels _______ Additional cable guides _____
Blowers
___ Top mounted___ Bottom mounted
Additional notes:
___________________________________
___________________________________
Cabling
Include complete information for all customersupplied cables to be attached to the T1 Channel
Bank chassis.
Show pinouts and cable lengths.
For crossover cables, draw the end-to-end connections; indicate which end is to be attached to the T1 Channel Bank.
Include punchdown block cable pair terminations where required.
Customer-supplied Cable Pinouts and Diagrams
APPENDIX B: Site Survey
Floor Plan
Include floor plans of all locations at which T1
Channel Bank chassis are to be installed. Show the equipment layout and indicate cable runs. Include site addresses, phone numbers, and contact personnel for each location. Use another sheet of paper if necessary.
Example Floor Plan
SITE __________________________________
CUSTOMER NAME ____________________
CONTACT PERSON ____________________
ADDRESS _____________________________
CITY ____________________ STATE ______
PHONE ( ____ )__________________________
Site Checkout Form
Please complete this form per site.
1. What is the line code for this site? (AMI, B7,
B8ZS) ___________________
2. What type of framing is used at this site?
(D4/SF, ESF)________________
3. CSU for T1s are (internal, external)
___________________
4. If external CSUs, who is the manufacturer?
__________________________
5. Type of PBX.
_______________________________
6. Levels expected at PBX, loss through PBX.
TX ____________________
RX ____________________
7. Are there sufficient 115VAC power outlets at this site for all the equipment?
Yes __________ No __________
• 14 slot chassis—1 required
8. Is the breaker rated for the equipment?
Yes __________ No __________
219
T1 CHANNEL BANK
9. Is a UPS system used with these AC outlets?
Yes __________ No __________
10. Is a good ground available, same as PBX?
Yes __________ No __________
11. Is there sufficient space to work around the system?
Yes __________ No __________
12. Is there sufficient air conditioning/ventilation in the room in which the system will reside?
Yes __________ No __________
13. Is the site a reasonably clean environment?
Yes __________ No __________
14. Will you use passwords on the system?
Yes __________ No __________
15. Will you install the MCC at this site?
Yes __________ No __________
16. Will the MCC ports be routed back to another location from here?
Yes __________ No __________
17. Will you use the multi-configuration option?
Yes __________ No __________
18. Have you established a timing chart?
Yes __________ No __________
19. Is this node a drop and insert or an end node?
D/I __________ end _________
20. Will this site have redundant T1s and redundant power?
redundant T1s __________ redundant power
__________
21. Are the voice circuits ground start or loop start?
Gnd start __________ loop start __________
22. Are the voice circuits 600 or 900 ohms?
600 __________ 900 __________
220
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