User Manual, HiGain H2TU-C-202 List 4G Line Unit

User Manual, HiGain H2TU-C-202 List 4G Line Unit
USER MANUAL
HiGain H2TU-C-202 List 4G Line Unit
Product Catalog: H2TU-C-202-L4G
CLEI: VACJDK5E
LTPH-UM-1170-01
Revision History of This Manual
Revision
Release Date
Revisions Made
1
November 8, 2002
Initial release.
Copyright
November 8, 2002
© 2002 ADC DSL Systems, Inc. All rights reserved.
Trademark Information
ADC is a registered trademark of ADC Telecommunications, Inc.
HiGain is a registered trademark of ADC DSL Systems, Inc. No right, license, or interest to such trademarks is granted hereunder,
and you agree that no such right, license, or interest shall be asserted by you with respect to such trademark.
Other product names mentioned in this document are used for identification purposes only and may be trademarks or registered
trademarks of their respective companies.
Disclaimer of Liability
Information contained in this document is company private to ADC DSL Systems, Inc., and shall not be modified, used, copied,
reproduced or disclosed in whole or in part without the written consent of ADC.
Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior notice. In no
event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits, and ADC further disclaims any
and all liability for indirect, incidental, special, consequential or other similar damages. This disclaimer of liability applies to all
products, publications and services during and after the warranty period.
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Using This Manual
USING THIS MANUAL
The following conventions are used in this manual:
•
Monospace type indicates screen text.
•
Keys you press are indicated by small icons such as Y or ENTER . Key combinations to be pressed
simultaneously are indicated with a plus sign as follows: CTRL + ESC .
•
Items you select are in bold.
•
Three types of messages, identified by icons, appear in text.
Notes contain information about special circumstances.
Cautions indicate the possibility of personal injury or equipment damage.
The Electrostatic Discharge (ESD) symbol indicates that a device or assembly is susceptible to
damage from electrostatic discharge.
For a list of abbreviations used in this document, refer to “Appendix E - Abbreviations” on page 58.
INSPECTING SHIPMENT
Upon receipt of the equipment:
•
Unpack each container and inspect the contents for signs of damage. If the equipment has been damaged in
transit, immediately report the extent of damage to the transportation company and to ADC DSL Systems,
Inc. Order replacement equipment, if necessary.
•
Check the packing list to ensure complete and accurate shipment of each listed item. If the shipment is short
or irregular, contact ADC DSL Systems, Inc. as described in “Appendix D - Product Support” on page 57. If
you must store the equipment for a prolonged period, store the equipment in its original container.
H2TU-C-202 List 4G
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Inspecting Shipment
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Table of Contents
TABLE OF CONTENTS
Overview ____________________________________________________________________________ 1
Features ..............................................................................................................................................1
Applications .......................................................................................................................................2
Front Panel __________________________________________________________________________ 3
On-board DIP Switch S2....................................................................................................................5
Installation___________________________________________________________________________ 6
Verification ........................................................................................................................................7
Provisioning__________________________________________________________________________ 8
Accessing the Provisioning Screens ..................................................................................................8
Connecting to a Maintenance Terminal...............................................................................8
Logon Screen .......................................................................................................................8
Provisioning Tasks ...........................................................................................................................11
Setting Date and Time .......................................................................................................11
Setting Circuit ID Numbers ...............................................................................................12
Configuring the System .....................................................................................................13
Resetting to Factory Defaults ............................................................................................24
Clearing the History, Alarm, and Event Log Screens .......................................................25
Monitoring System Activity and Performance ____________________________________________ 26
Using the Monitor Screen to View System Activity........................................................................26
Using the Performance Screens to View Performance Data............................................................28
Performance History at the DS1 Interface.........................................................................28
Performance History at the HDSL2 Interface ...................................................................31
Using the Performance Screens to View Alarm Data......................................................................34
Alarm History at the DS1 Interface ...................................................................................34
Alarm History at the HDSL2 Interface..............................................................................37
Using the System Event Log to Track Events .................................................................................38
Event Log Messages ..........................................................................................................39
Origin Tags ........................................................................................................................40
Using the Report Menu ....................................................................................................................41
Testing _____________________________________________________________________________ 43
System Alarms .................................................................................................................................43
Alarm Option for the Digital Loop Carrier Feed...............................................................44
Remote LOS and AIS Response........................................................................................44
OCT55 Test Pattern with AMI Line Code.......................................................................................45
Loopback Operation.........................................................................................................................45
Special Loopback (SPLB) Mode .....................................................................................................46
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GNLB Mode Loopback Commands ................................................................................. 46
A3LB Mode Loopback Commands .................................................................................. 46
Loopback Test Procedures .............................................................................................................. 47
General Troubleshooting Tips .......................................................................................... 47
Loopback Timeout Option ................................................................................................ 47
GNLB Test Procedures ..................................................................................................... 48
A3LB Test Procedures ...................................................................................................... 49
Loopback Testing Using a Maintenance Terminal ........................................................... 50
Loopback Testing Using Remote Unit Front-Panel Pushbuttons ..................................... 50
Appendix A - Specifications ____________________________________________________________ 51
Power Consumption ........................................................................................................................ 52
Maximum Power Dissipation .......................................................................................................... 52
Maximum Current Drain ................................................................................................................. 52
Insertion Loss and Loop Attenuation .............................................................................................. 53
H2TU-C Card-Edge Connector....................................................................................................... 53
Fuse Alarm ........................................................................................................................ 53
Network Management Control Bus .................................................................................. 54
System Alarm Output Pin ................................................................................................. 54
Craft Port ......................................................................................................................................... 54
Appendix B - Functional Operation _____________________________________________________ 55
Timing ............................................................................................................................................. 55
Ground Fault Detection ................................................................................................................... 55
Appendix C - Compatibility____________________________________________________________ 56
Appendix D - Product Support _________________________________________________________ 57
Appendix E - Abbreviations____________________________________________________________ 58
Certification and Warranty _____________________________________________ Inside Back Cover
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List of Figures
LIST OF FIGURES
1. H2TU-C Front Panel......................................................................................................................................3
2. On-board DIP Switch S2................................................................................................................................5
3. Installing an H2TU-C into a Shelf .................................................................................................................6
4. Logon Screen .................................................................................................................................................9
5. Config Menu - Date and Time .....................................................................................................................11
6. Typical Inventory Screen .............................................................................................................................12
7. Config Menu ................................................................................................................................................13
8. Config Menu - Standard Options (defaults shown) .....................................................................................14
9. Config Menu - ADC Options (defaults shown) ...........................................................................................14
10. Config Menu - Set Factory Defaults ............................................................................................................24
11. Config Menu - Master Clear ........................................................................................................................25
12. Monitor Screen - Active Loopback with Alarms.........................................................................................26
13. H2TU-R DS1 31-Day Performance History ................................................................................................28
14. H2TU-C DS1 48-Hour Performance History ..............................................................................................29
15. H2TU-R DS1 25-Hour Performance History ..............................................................................................29
16. H2TU-R DS1 Current Statistics...................................................................................................................30
17. H2TU-C DS1 Current Statistics...................................................................................................................30
18. H2TU-C HDSL2 31-Day Performance History...........................................................................................32
19. H2TU-C HDSL2 48-Hour Performance History .........................................................................................32
20. H2TU-C HDSL2 25-Hour Performance History .........................................................................................33
21. H2TU-C HDSL2 Current Statistics .............................................................................................................33
22. H2TU-C DS1 Alarm History Screen ...........................................................................................................35
23. H2TU-R DS1 Alarm History Screen ...........................................................................................................35
24. H2TU-C HDSL2 Alarm History Screen ......................................................................................................37
25. System Event Log ........................................................................................................................................38
26. Report Menu - Full Report...........................................................................................................................41
27. H2TU-R LOS and AIS Response Priorities.................................................................................................44
28. Loopback Summary .....................................................................................................................................45
29. Loopback Modes..........................................................................................................................................49
30. H2TU-C Card-Edge Connector ...................................................................................................................53
31. RS-232 Craft Port Pinouts............................................................................................................................54
32. H2TU-C Block Diagram ..............................................................................................................................55
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List of Tables
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LIST OF TABLES
1. Front-Panel Description ................................................................................................................................ 4
2. Functions of DIP Switch S2 .......................................................................................................................... 5
3. LED Status and Functions............................................................................................................................. 7
4. Navigational Keys for the Maintenance Terminal Screens........................................................................... 9
5.
Logon Screen Menus.................................................................................................................................. 10
6. H2TU-C Standard Config Menu Options ................................................................................................... 15
7. H2TU-C ADC Config Menu Options ......................................................................................................... 16
8. DS1 and DSX-1 24-Hour PM Threshold .................................................................................................... 18
9. Response to H2TU-R DS1 Frame Conversion Options.............................................................................. 20
10. Extended SuperFrame Format..................................................................................................................... 21
11. SuperFrame Format..................................................................................................................................... 21
12. DDS NI and DS0 DP Latching Loopback Sequence .................................................................................. 22
13. HiGain HDSL2 Loopback vs. Latching Sequence ..................................................................................... 22
14. Response of H2TU-C and H2TU-R to LOS and AIS ................................................................................. 23
15. Monitor Screen Descriptions....................................................................................................................... 27
16. Error Acronyms Used on the DS1 Performance History Screens............................................................... 31
17. Error Acronyms Used on the HDSL2 Performance History Screens ......................................................... 34
18. DS1 Alarm Descriptions ............................................................................................................................. 36
19. HDSL2 Alarm Descriptions ........................................................................................................................ 37
20. Event Log Entry Messages.......................................................................................................................... 39
21. Origin Tags.................................................................................................................................................. 40
22. Report Types ............................................................................................................................................... 42
23. System Alarms Summary............................................................................................................................ 43
24. Summary of HDSL2 Generic Loopback Codes and Activation Methods .................................................. 48
25. Addressable Repeater Loopback Commands (A3LB) ................................................................................ 50
26. H2TU-C Power Parameters......................................................................................................................... 52
27. HDSL2 Reach Chart ................................................................................................................................... 53
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Overview
OVERVIEW
The H2TU-C-202 List 4G (H2TU-C) line unit is the Central Office (CO) side of a T1 transmission system. The
HiGain HDSL2 product family is fully compliant with the HDSL2 standard ANSI T1.418.
The H2TU-C, when used with an H2TU-R remote unit, transmits a 1.552 Mbps payload on one unconditioned
copper pair over the full Carrier Service Area (CSA) range. The CSA includes loops up to 12,000 feet of 24 AWG
wire or 9,000 feet of 26 AWG wire, including bridged taps.
The H2TU-C is designed to mount in standard 200 and 400 mechanics shelves. For a list of compatible shelves,
see “Appendix C - Compatibility” on page 56.
FEATURES
Standard features include:
•
•
HDSL2 transmission features
–
Lightning and power cross-protection on HDSL2 interfaces
–
Full-duplex HDSL2 transmission on one pair at 1.552 Mbps
–
Ultra-low wander (Stratum 1 compliant)
–
Grounded loop detection on High-bit-rate Digital Subscriber Line 2 (HDSL2)
–
Tip and ring reversal detection on HDSL2 loop
–
Sources sealing current when connected to an H2TU-R
Front-panel features
–
DSX-1 signal access
–
Status Light Emitting Diodes (LEDs)
–
RS-232 craft port for maintenance terminal connection
•
Digital Data Service (DDS) latching loopback
•
Maintenance screens to provision, monitor, and troubleshoot HDSL2 system
•
–
DS1 and HDSL2 performance monitoring
–
Loop attenuation and insertion loss reporting
–
Non-volatile storage of performance monitoring parameters
–
Performance Report Messaging (PRM) support for Supplemental PRM (SPRM) and Network PRM
(NPRM) at the H2TU-R
–
Payload (PL) and HDSL Generic (HG) loopback source identification
–
Margin Alarm (MAL) threshold
–
Report menu option for downloading status and performance monitoring data to a file
–
Remote provisioning through TL1 FDL
–
Fractional T1 (FT1) support
Configuration options
–
Selectable DSX-1 pre-equalizer
–
Bipolar Violation Transparency (BPVT)
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Overview
LTPH-UM-1170-01
–
Bit Error Rate (BER) alarm
–
Remote provisioning
–
Power Back Off - Customer (PBOC) and Power Back Off - Network (PBON) for configuring power
output levels
–
Loss of Signal/Alarm Indication Signal (LOS/AIS) payload alarm
–
Selectable loopback activation codes
DS1 is used throughout this document to refer to either the remote unit’s DS1 interface or the
line unit’s DSX-1 interface.
APPLICATIONS
HiGain HDSL2 systems provide a cost-effective, easy-to-deploy method for delivering T1 High Capacity Digital
Service (HCDS) over a single copper pair. HiGain HDSL2 systems support a multitude of network connections
and system models.
•
The service is deployed over one unconditioned, non-loaded copper pair.
•
Conventional inline DS1 repeaters are no longer required.
•
Cable pair conditioning, pair separation and bridged tap removal are not required.
Each loop has no more than 35 dB of insertion loss (INSL) at 196 kHz, with driving and terminating impedances
of 135Ω. In general, HiGain HDSL2 systems:
2
•
Operate effectively in the same cable binder group with other HDSL2 lines, HDSL, T1, ADSL, SDSL, POTS,
DDS, and other transmission schemes.
•
Can be used with customers requiring DS1 service on a temporary or permanent basis.
•
Provide a means of quickly deploying service in advance of fiber-optic transmission systems.
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Front Panel
FRONT PANEL
Figure 1 shows the H2TU-C front panel. Table 3 on page 7 describes the front-panel components. For pinout
diagrams of the H2TU-C card-edge connector and craft port, refer to “Appendix A - Specifications” on page 51.
List number
L
DSL
Front-panel LEDs
ALM
H
2
T
U
*
C
2
0
2
DSX/
DS1
ESF/SF
YEL/GRN
B8ZS/AMI
D
S
X
1
LBK
IN
LINE
OUT
DSX-1 test access jacks
IN
MON
OUT
RS-232
DCE
Craft port
CLEI and ECI bar code label
(on outside of card handle)
Extraction handle
H0001-B
Figure 1.
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H2TU-C Front Panel
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Front Panel
LTPH-UM-1170-01
Table 1. Front-Panel Description
Front-Panel Feature
Function
List number
Identifies the list number of the H2TU-C.
Front-panel LEDs
Display HDSL2 and DS1 line, provisioning, and alarm status through front-panel LEDs. Refer to
Table 3 on page 7 for a listing of the front-panel LEDs and their functions.
DSX-1 access jacks
4
MON
Provides non-intrusive monitoring jack access to (IN) and from (OUT) the HDSL2 span at the
DSX-1 interface. Allows the two DS1 payloads to be monitored.
LINE
Provides splitting jack access to (IN) and from (OUT) the HDSL2 span at the DSX-1 interface. Breaks
the OUT and IN paths to permit test signal insertion and retrieval.
Craft port (RS-232)
Provides bidirectional communication between the unit and an external terminal to allow
configuration and performance monitoring through the maintenance terminal screens.
CLEI and ECI bar code label
Provides the human-readable Common Language Equipment Identifier (CLEI) code number and the
Equipment Catalog Item (ECI) bar code number.
Extraction handle
Used to insert and extract the H2TU-C from the chassis.
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Front Panel
ON-BOARD DIP SWITCH S2
The H2TU-C circuit board has an 8-position DIP switch, S2 (see Figure 2 below). Options that are configurable
through the DIP switch cannot be configured through the maintenance terminal screens. Configuration
information for the switches is reported on the screens, but is “read only.” OFF is the default setting of all switches.
Table 2 describes the functions of DIP switch S2.
DIP switch S2 is the only means by which the options it controls can be set. The maintenance
terminal screens showing these option settings are read-only.
Table 2. Functions of DIP Switch S2 (a)
Switch
Number
Settings
Description
1 (b)
2 (a)
SW2
OFF
OFF
ON
ON
3
FRM / UNFR
SW1
OFF = 0 ft.
ON = 0 to 133 ft.
OFF = 134 to 266 ft.
ON = 0 to 133 ft.
Sets DSX-1 equalization
Sets DS1 frame formatting to Framed or UnFramed
(c)
4
ESF / SF
5
B8ZS / AMI
Sets DS1 frame formatting to ESF or SF
Sets DS1 line coding to Bipolar with 8-Zero Substitution (B8ZS) or
Alternate Mark Inversion (AMI)
6
LBTO ENA / LBTO DIS
Enables or disables 120-minute Loopback Timeout (LBTO)
7
T1/FT1
Sets mode to either T1 or Fractional T1 (FT1)
8
SPAN PWR / LCL PWR
Enables line power or local power
(a) Default (“OFF”) settings are in boldface type.
(b) If SW1 and SW2 are both enabled, the lowest value setting has priority.
(c) ESF or SF are valid only if FRM is set.
L
DSL
ON
1
ALM
H
2
T
U
*
C
2
0
2
2
3
DSX/
DS1
S2
4
ESF/SF
YEL/GRN
B8ZS/AMI
5
LBK
6
D
S
X
1
7
8
IN
DIP switch S2
(located on
circuit board)
LINE
OUT
IN
MON
OUT
RS-232
DCE
H0405-A
Figure 2.
H2TU-C-202 List 4G
On-board DIP Switch S2
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Installation
LTPH-UM-1170-01
INSTALLATION
When installing an H2TU-C in a chassis, be sure to wear an antistatic wrist strap. Avoid touching
components on the circuit board.
H2TU-C-202
CO Shelf
H0005-A
Figure 3. Installing an H2TU-C into a Shelf
Before installing the H2TU-C, configure the options set by DIP switch S2. See “On-board DIP
Switch S2” on page 5.
1
Align the H2TU-C with the enclosure slot guides, then push the unit in until it touches the backplane
card-edge connector.
2
Place your thumbs on the H2TU-C front panel and push the unit in until firmly seated in the card-edge
connector.
To comply with the intrabuilding wiring requirements of GR-1089 CORE, Section 4.5.9, the
shields of the ABAM-type cables that connect the H2TU-C DSX-1 output ports to the
cross-connect panel must be grounded at both ends.
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Installation
VERIFICATION
Once the H2TU-C is installed, verify that it is operating properly. To do this, monitor the front-panel status LEDs.
Table 3 below lists the LED status and their functions (the H2TU-C reports alarm types and loopback status on
its front panel).
1
Verify that as the H2TU-C powers up, it attempts to communicate with a remote unit as the DSL LED flashes
red once every second.
•
If the H2TU-C is unable to communicate with the H2TU-R, the DSL LED displays solid red, indicating
HBER, MARG, or PWRF alarms.
•
If the H2TU-C is able to communicate with the H2TU-R, the DSL LED displays solid green, indicating
that the HDSL2 spans are synchronized without error.
2
Verify the presence of a DS1 signal by confirming that the ALM LED is off (not lit). If the ALM LED
displays red or yellow, a DS1 LOS condition exists. Refer to Table 3 to locate the problem.
3
Verify error free DS1 transmission by confirming that the DS1, framing (ESF/SF), and line code (B8ZS/AMI)
LEDs display solid colors. Refer to Table 3 to locate the problem if these LEDs are either flashing or display
solid red.
Table 3.
LED and Status
LED Status and Functions
Function
DSL
OFF No power is applied to the H2TU-C.
Solid green Normal operation: all HDSL2 spans are synchronized without error.
Solid red HBER, MARG, or PWRF alarm is present at the H2TU-C.
Flashing red once every second HDSL2 loop is attempting synchronization.
ALM
OFF Normal operation: the DSX-1 signal is present at both the H2TU-R and H2TU-C.
Solid yellow RLOS is present at the H2TU-R.
Solid red LLOS is present at the H2TU-C.
DSX/DS1
Solid green Normal operation: the DSX-1 signal is error free.
Solid red LLOS, BPV, frame error, or CRC is present at the H2TU-C.
ESF/SF
OFF Unframed DSX-1 is present at the H2TU-C or no DSX-1 is detected at the H2TU-C.
Solid yellow ESF frame formatting is present at the H2TU-C.
Flashing yellow once every second ESF frame formatting and frame error/CRC are present at the H2TU-C.
Solid green SF frame formatting is present at the H2TU-C.
Flashing green once every second SF frame formatting and frame error are present at the H2TU-C.
B8ZS/AMI
OFF No DSX-1 signal is present at the H2TU-C.
Solid yellow B8ZS is provisioned at the H2TU-C.
Flashing yellow once every second B8ZS and excess zeros string are present at the H2TU-C.
Solid green AMI is provisioned at the H2TU-C.
Flashing green once every second AMI and BPV are present at the H2TU-C.
LBK
OFF H2TU-C is not in loopback.
Solid yellow H2TU-C is in either NLOC or CREM (RLB).
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Provisioning
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PROVISIONING
Certain options are configured only by a DIP switch on the H2TU-C (see “On-board DIP Switch
S2” on page 5). Other options are configured using the maintenance terminal Config menus
(see “Making Changes to Standard and ADC Options” on page 13).
ACCESSING THE PROVISIONING SCREENS
Use a maintenance terminal (ASCII terminal or a PC running terminal emulation software) connected to the
H2TU-C craft port (or to an HMU craft port) to access the status, history, inventory, and provisioning screens
(see Figure 4 on page 9).
Connecting to a Maintenance Terminal
The craft port on the front panel allows you to connect the H2TU-C to a maintenance terminal, such as an ASCII
terminal or PC running a terminal emulation program. Once connected to a maintenance terminal, you can access
the maintenance, provisioning, and performance screens.
To connect to a maintenance terminal:
1
Connect a standard 9-pin terminal cable to the RS-232 craft port on the H2TU-C front panel (Figure 1 on
page 3).
2
Connect the other end of the cable to the serial port on the maintenance terminal.
3
Start a terminal emulation program such as Procomm (emulating a VT100 terminal).
4
Configure the maintenance terminal for the following communication settings:
5
•
9600 baud
•
No parity
•
8 data bits
•
1 stop bit
•
Hardware flow control set to OFF
If necessary, press
CTRL
+
R
to refresh the HDSL2 logon screen.
Logon Screen
The maintenance terminal screens allow you to monitor, provision, and troubleshoot an HDSL2 system.
To select a menu from the logon screen (Figure 4 on page 9), do one of the following:
•
Press the underlined letter of the menu.
•
Use the
← →
arrow keys to select the menu, then press
ENTER .
Table 4 on page 9 summarizes the navigational keys. They are also listed in the onscreen Help menu. Table 5 on
page 10 describes the logon screen menus.
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Provisioning
Menu bar
Circuit ID
Date and Time
Logon Device
System Status
Figure 4. Logon Screen
Table 4.
Navigational Keys for the Maintenance Terminal Screens
Key (a)
Function
SPACEBAR
Cycle through selections.
ENTER
Activate the current setting or choice, or display a menu.
ESC
Return to the parent menu.
or F11 (VT100 only)
↑
or CTRL + E
Select the submenu or item above the current one, or return to the previous menu.
↓
or CTRL + X
Select the submenu or item below the current one.
→
or CTRL + D
Select the menu or item to the right of the current one.
←
or CTRL + S
Select the menu or item to the left of the current one, or return to the previous menu.
CTRL
+ R
Refresh the screen.
(a) Legacy management units require use of control keys instead of arrow keys.
Most VT100 emulation programs support a print screen option. For Windows-based programs,
such as Procomm or HyperTerminal, see the Help menu for instructions.
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Table 5.
10
Logon Screen Menus
Press this key:
To access this menu:
Menu Functions
M
Monitor
Monitors loopbacks and alarms, provides a graphical representation of circuit activity,
including ES, UAS, SES, and line code.
P
Performance
Provides performance and alarm histories for current, 25-hour, 48-hour, or 31-day
periods for either the DS1 or HDSL2 interface.
E
Event Log
Identifies the 100 most recent system events and reports the date and time of
occurrence.
C
Config
Provides standard configuration options, ADC options, date and time setting, and a
reset option (factory settings). Also provides a master clear option that clears all
performance, alarm, and event log entries.
I
Inventory
Provides product information about the various devices that are in the system and
lists circuit and device identifications.
O
Report
Provides four types of reports: Full Report, Short Report, System Information Report,
and Event Report.
R
Rlogon/Rlogout
Remote logon can be performed from the H2TU-C or H2TU-R. The screen displays
Rlogout when the H2TU-C or H2TU-R is remotely logged on to the other unit at the
end of the circuit.
To log off from the remote unit, press R . Rlogout changes to Rlogon. The unit is now
locally logged on until R is pressed again to reinitiate the remote logon.
H
Help
Provides a glossary of terms used in the maintenance screens, a list of navigational
keys, print guide, and ADC contact information.
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Provisioning
PROVISIONING TASKS
After the H2TU-C is successfully installed, perform these basic provisioning tasks:
•
Set date and time (see “Setting Date and Time” on this page).
•
Set circuit ID numbers (see “Setting Circuit ID Numbers” on page 12).
•
Make any configuration changes (see “Configuring the System” on page 13).
•
Clear history, alarm, and event log screens to remove miscellaneous data acquired during startup (see
“Clearing the History, Alarm, and Event Log Screens” on page 25).
Setting Date and Time
To set the date and time:
1
Press
2
Use the
3
Type the date in the format indicated (see Figure 4), then press
4
Type the time in the format indicated (entering seconds is optional), then press
C
to select the Config menu.
↑
and
↓
arrow keys to select Date and Time, then press
Figure 5.
H2TU-C-202 List 4G
ENTER .
ENTER .
ENTER .
Config Menu - Date and Time
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Provisioning
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Setting Circuit ID Numbers
The Inventory screen provides product information on all units in the system and allows setting of the circuit and
unit identification numbers.
To set the circuit ID numbers:
1
Press
2
Type the Circuit ID number in the field indicated (see Figure 5), then press
3
Type the ID numbers of all other devices listed in the system, pressing
I
to select the Inventory screen.
Figure 6.
12
ENTER .
ENTER
after each entry.
Typical Inventory Screen
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Configuring the System
The Config menu (see Figure 6) allows you to make the following changes:
•
Standard options (see Figure 8 on page 14).
•
ADC options (see Figure 9 on page 14).
•
Date and time (see “Setting Date and Time” on page 11).
•
Master clear (see “Clearing the History, Alarm, and Event Log Screens” on page 25).
•
Reset to factory default configuration (see “Resetting to Factory Defaults” on page 24).
Figure 7.
Config Menu
Making Changes to Standard and ADC Options
Figure 8 on page 14 and Figure 9 on page 14 show the Standard and ADC configuration options. Standard options
are those supported by HiGain HDSL2 units when connected to units from other vendors. ADC options are an
extended set of options that are only available when using HiGain units exclusively.
Table 6 on page 15 and Table 7 on page 16 describe the Config menu options and the available settings for each
option. The settings in bold type are the factory default settings.
The Config menu options designated as “Read only” in Table 6 and Table 7 are set with DIP
switch S2 and cannot be changed from a maintenance terminal. See “On-board DIP Switch S2”
on page 5.
To make changes to these options:
C
1
Press
to select the Config menu.
2
Use the
3
Use the arrow keys to select an option.
4
Press the
5
Press
↑
and
arrow keys to select Standard Options or ADC Options, then press
SPACEBAR
ENTER
H2TU-C-202 List 4G
↓
ENTER .
to cycle through the settings for that option.
to activate your choice.
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Figure 8.
Figure 9.
14
Config Menu - Standard Options (defaults shown)
Config Menu - ADC Options (defaults shown)
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Table 6.
Standard Config Menu
Options
H2TU-C Standard Config Menu Options
Selection
Description
Loopback Timeout
(LBTO - Read only)
None
Disables automatic time-out cancellation of all loopbacks.
120 min
Sets automatic time-out cancellation of all loopbacks for 120 minutes.
Loop Attenuation Threshold
(LATT)
0 through
40 dB
Determines the maximum loop attenuation before an alarm is declared. Zero
disables the alarm. The loop attenuation threshold can only be set through the
maintenance screens.
32 dB
Default value.
0 to 15 dB
Determines the minimum allowable margin below which a system alarm can
occur. Zero disables the alarm. The Margin (Alarm) Threshold can only be set
through the maintenance screens.
4 dB
Default value.
SF
Configures the HiGain HDSL2 system to search for the SF framing pattern at its
DS1 input.
ESF
Configures the HiGain HDSL2 system to search for the ESF framing pattern at its
DS1 input.
UNFR
Configures the HDSL2 system to operate in an unframed mode. This mode forces
the system to function as a transparent bit pipe. Only line parameters are
considered when monitoring DS1 performance.
DS1 Line Coding
(DS1 - Read only)
B8ZS
AMI
Configures the HDSL2 system for B8ZS line code.
Configures the HDSL2 system for AMI line code.
H2TU-C Equalization
(EQL - Read only)
See “H2TU-C Equalization
(EQL) Option.” on page 17.
OFF
No DSX-1 equalization.
0 to 133 ft.
Sets the equalizer to DSX-1 for 0 to 133 feet.
134 to 266 ft.
Sets the equalizer to DSX-1 for 134 to 266 feet.
Margin Threshold (MARG)
DS1 Frame Formatting
(FRMG - Read only)
H2TU-R Line Buildout (RLBO)
Sets the DS1 receive level output toward the Customer Interface (CI). H2TU-R Line
Buildout can only be set through the maintenance screens.
0 dB
Sets the DS1 RLBO level toward the CI to 0 dB.
-7.5 dB
Sets the DS1 RLBO receive level toward the CI to -7.5 dB.
-15.0 dB
Sets the DS1 RLBO receive level toward the CI to -15.0 dB.
Alarm Pattern (ALMP)
See “Alarm Pattern (ALMP)
Option.” on page 17.
AIS
Enables the HDSL2 system to output an AIS payload at its DS1 ports for LOSW and
DS1 LOS. For priority resolution, see Figure 27 on page 44.
LOS
Enables the HDSL2 system to output an LOS condition at its DS1 ports for LOSW
and DS1 LOS.
H2TU-R TLOS Loopback
(TLOS)
ENA
Enables a logic loopback at the H2TU-R when an LOS occurs at its DS1 input, if
enabled at the H2TU-R. For priority resolution, see Figure 27 on page 44.
DIS
Disables Transmit Loss of Signal (TLOS) logic loopback.
Continued
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Table 6.
Standard Config Menu
Options
H2TU-C Standard Config Menu Options (Continued)
Selection
Description
AIS
Enables the H2TU-R to transmit an AIS toward CI for any network loopback. For
priority resolution, see Figure 27 on page 44.
LOS
Enables the H2TU-R to transmit an LOS toward CI for any network loopback.
Power Back Off - Network
(PBON)
See “Power Back Off
Customer (PBOC) and Power
Back Off Network (PBON)
Options” on page 18.
DEF
Configures the power output levels of the H2TU-C network unit toward the
customer to comply with the Default template as defined in Section 6.1.4.2 of ANSI
T1/E1.4.
ENH
Configures the power output levels of the H2TU-C network unit toward the
customer to comply with the Enhanced template as defined in Section 6.1.4.2 of
ANSI T1/E1.4.
Power Back Off - Customer
(PBOC)
See “Power Back Off
Customer (PBOC) and Power
Back Off Network (PBON)
Options” on page 18.
DEF
Configures the power output levels of the H2TU-R customer unit toward the
network to comply with the Default template as defined in Section 6.1.4.2 of ANSI
T1/E1.4.
ENH
Configures the power output levels of the H2TU-R customer unit toward the
network to comply with the Enhanced template as defined in Section 6.1.4.2 of
ANSI T1/E1.4.
Network Loopback Pattern
(NLBP)
Table 7.
ADC Config
Menu Options
H2TU-C ADC Config Menu Options
Selection
Description
Line Power Feed
(PWRF - Read only)
OFF
Disables powering to the HDSL2 pair.
ON
Keeps the HDSL2 line voltage at nominal -180 Vdc.
Remote Provisoning (RTPV)
ENA
Enables provisioning at the H2TU-R remote unit
DIS
Disables provisioning at the H2TU-R remote unit
Bipolar Violation Transparency
(BPVT)
See “Bipolar Violation
Transparency (BPVT) Option”
on page 18.
ENA
Enables HDSL2 CRC and BPV errors at the DS1 input to be converted into DS1 BPVs
at the DS1 output at the distant end. This makes HDSL2 transparent to BPVs.
DIS
Disables BPV Transparency.
DS1 BER (DBER)
See “DS1 BER (DBER) Option”
on page 18.
ENA
Enables the fixed 24-hour DS1 BER threshold (10-6).
DIS
Prevents the generation of a system alarm due to DS1 BER.
HDSL2 BER Threshold (HBER) 1E-6
See “HDSL2 BER Threshold
(HBER) Option” on page 19.
1E-7
Front-panel alarm is displayed and the Status LED flashes red when the Block Error
Rate (BER) threshold exceeds 10-6. BER is based on the definition of Bit Error Rate.
Front-panel alarm is displayed and the Status LED flashes red when the Block Error
Rate (BER) threshold exceeds 10-7.
NONE
Prevents generation of a system alarm due to BER.
Special Loopback Mode
(SPLB)
See “Special Loopback (SPLB)
Mode” on page 46.
GNLB
Configures the HDSL2 system to respond to the generic inband loopback codes.
A3LB
Configures the HDSL2 system to respond to the inband loopback codes of the
Wescom addressable repeater.
SmartJack Loopback (LPBK)
ENA
Enables the HDSL2 system to recognize all inband SmartJack (SMJK) loopback
commands.
DIS
Configures the HDSL2 system to ignore all inband SmartJack loopback commands.
Continued
16
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Table 7.
H2TU-C ADC Config Menu Options (Continued)
ADC Config
Menu Options
Selection
Description
Minor Alarm (ALM)
ENA
Enables the generation of the output alarm on pins 22 and 30 when a system alarm
condition occurs.
DIS
Disables the generation of the output alarm on pins 22 and 30 when a system alarm
condition occurs.
CI
If ALMP is set to AIS, this option specifies which pattern is sent to the network when
a remote LOS or AIS occurs. When configured for CI, an AIS-CI pattern is sent to the
network. For priority resolution, see Figure 27 on page 44.
AIS
When configured for AIS, an AIS pattern is sent to the network.
SPRM
The H2TU-R generates Supplemental PRM (SPRM) every second if no PRM is
present from the CPE within 5 seconds of a reset or an LOS/AIS/OOF condition
occurs. TL1 commands and responses are enabled.
NPRM
The H2TU-R generates Network PRM (NPRM) if no PRM is present from the CPE. If
the CPE is sending PRMs, NPRM is generated, in addition to the existing PRM, every
second. TL1 commands and responses are enabled.
S+N
The H2TU-R generates an NPRM which is tagged on to an SPRM every second. The
H2TU-R generates SPRM if no PRM is present from the CPE. If the CPE is sending
PRM, the PRM is converted to an SPRM. TL1 commands and responses are enabled.
OFF
ESF Datalink (DL) is completely transparent. No PRMs are generated. There are no
TL1 responses unless the system is first armed by a TL1 command, which enables
Performance Monitoring.
RAI to RAI-CI towards NET
See “RAI to RAI-CI toward NET
(RACI) Option” on page 19.
ENA
Allows DS1 RAI (yellow alarm) signal received by the H2TU-R to be converted to an
RAI-CI signal towards the network.
DIS
Prevents conversion of the DS1 RAI to an RAI-CI signal.
ESF-RAI to SF-RAI Overwrite
(ROVR)
See “ESF-RAI to SF-RAI
Overwrite (ROVR) Option” on
page 20.
ENA
If the CONV option is set to FCON or ACON, an ESF DS1 payload from the network
with an embedded RAI pattern is converted to an SF-RAI pattern toward the CI at the
H2TU-R.
DIS
Prevents conversion to an SF-RAI pattern.
H2TU-R DS1 Frame
Conversion (CONV)
See “H2TU-R DS1 Frame
Conversion (CONV) Option” on
page 20.
OFF
Framing determined by the DS1 frame formatting option.
ACON
Auto (ACON) detection of framing and potential frame conversion at the remote.
FCON
Auto detection of framing and forced frame format conversion (FCON) at the
H2TU-R.
Fractional T1 Mode
(FT1 - Read only)
See “Fractional T1 Mode (FT1)
Option” on page 22.
ENA (DIP
switch S2
set to FT1)
Enables system response to DDS latching loopback commands for fractional T1
applications, CP disconnect, and trouble indication. For priority resolution, see
Figure 27 on page 44.
DIS (DIP
switch S2
set to T1)
Disables system response to DDS latching loopback commands.
Network AIS Pattern (NAIS)
Performance Report
Messaging (PRM)
H2TU-C Equalization (EQL) Option. The equalizer shapes the DS1 output signal of the H2TU-C to conform
to a very specific pulse template when it arrives at the DSX-1 cross-connect point. The degree of pulse-shaping
required is a function of the distance between the H2TU-C equipment bay and the DSX-1 panel. Thus, the
equalizer has three discrete settings, OFF, 0 to 133 feet, and 134 to 266 feet.
Alarm Pattern (ALMP) Option. To improve HiGain HDSL2 compatibility with the switch-to-protect features
used in Digital Loop Carrier (DLC) feeder applications, the H2TU-C has an Alarm Pattern (ALMP) option that
allows you to select either an AIS or LOS DS1 output payload for the following alarms:
•
LOSW on any loop
•
LOS DS1
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Power Back Off Customer (PBOC) and Power Back Off Network (PBON) Options. Power Back Off
Customer (PBOC) and Power Back Off Network (PBON) allow the HDSL circuit to support two transmit power
templates: default (DEF/higher level) and enhanced (ENH/lower level). These are defined in Section 6.1.4.2 of
the ANSI T1E1.4 HDSL2 standard. Each HDSL2 receiver detects the level it is receiving during the start-up,
pre-activation sequence. It then compares this level to the level it should be receiving according to the PBOC and
PBON option settings (DEF or ENH). If the received level is outside the template limits, the receiver sends a
message to the upstream HDSL2 transmitter requesting the proper level. These levels are adjusted only during the
start-up routine or if the PBOC or PBON option settings are changed during normal operation. Since the ENH
template levels are up to 15 dBm below those of the DEF template, the ENH setting can be used to reduce crosstalk
levels into adjacent circuits. (For example, if crosstalk noise is being induced by the H2TU-R, set the PBOC option
to its lower (ENH) level setting. Conversely, if the HDSL2 signal at the H2TU-R is being affected by crosstalk
noise induced from adjacent pairs, set the PBOC option to its higher (DEF) level setting.
Changing these Power Back Off option settings on a live circuit causes the HDSL2 loop to
momentarily drop and then reacquire synchronization. This setting can also affect the operating
margins.
Bipolar Violation Transparency (BPVT) Option. The H2TU-C improves compatibility with Digital Loop
Carrier (DLC) feeder applications because of its ability to transmit DS1 BPV occurrences between its DS1
interfaces. This feature is required to support protection switching in DLC applications. Each DLC terminal must
be able to monitor the integrity of its Receive DS1 payload and then switch to the protect line when the integrity
of the path drops below specific user selected limits. An essential requirement of this feature is the need for each
DLC terminal to detect BPVs in its DS1 input. Standard HDSL systems correct DS1 BPVs at the input and,
therefore, prevent them from being detected by the DLC terminals to which they are connected. The H2TU-C and
its associated remote units remove this limitation and become BPV transparent by detecting and counting input
BPVs at each end and then by replicating them at the DS1 output port of the distant end.
The BPV count is converted into BPVs at the distant end during the following second at a rate of 1 BPV every
128 DS1 bits up to a maximum of 12000 (BER = 7.7 x 10-3). This maximum rate is more than adequate since it
exceeds the maximum 10-3 BER required by most DLC systems.
DS1 BER (DBER) Option. The DS1 BER alarm occurs when any of the DS1 or DSX-1 performance
monitoring parameters listed in Table 8 exceed the counts shown for the 24-hour period between 12:00:00 AM
through 11:59:59 PM. These thresholds correspond to a 10-6 BER. All PM counters clear to zero at 12:00:00 AM
or when Master Clear is selected.
Table 8.
18
DS1 and DSX-1 24-Hour PM Threshold
Parameter
Threshold Count
CV-L (BPV)
133,400
ES-L, ES-P, PRM, PDVS-L
648
SES-L, SES-P
100
UAS-P, UAS-L
10
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HDSL2 BER Threshold (HBER) Option. The HBER option permits the monitoring of loop integrity and
reporting of alarms when excessive errors are detected. The PM primitive used for this purpose is the CRC
checksum performed on the HDSL2 frame for both directions of transmission. It is, therefore, called a block error
rate rather than the bit error rate associated with the DS1 interface. The CRC errors and counts are displayed on
the Monitor screen for both the H2TU-C and H2TU-R. The HBER option allows an alarm to be generated if the
total number of CRCs at either the H2TU-C or H2TU-R exceeds the selected BER threshold during the last
1-minute interval.
•
HBER option = 1E-6. Alarm is generated if CRC > 93
•
HBER option = 1E-7. Alarm is generated if CRC > 9
Once initiated, the HBER count clears when the CRC count drops below the selected threshold. Selecting NONE
inhibits this alarm.
RAI to RAI-CI toward NET (RACI) Option. The H2TU-C in conjunction with the H2TU-R supports the
RAI-CI function.
The RAI-CI signal is a RAI signal which contains a signature indicating that an LOF or AIS failure has occurred
in the customer installation (CI) at the H2TU-R unit and that the defect or failure which caused the origination of
that RAI is not found in the signal from the network. Therefore, RAI-CI is transmitted toward the network when
the following two conditions are simultaneously true at the point from which RAI-CI originated (at the H2TU-R,
toward the network):
•
Condition 1—RAI is received from the CI.
•
Condition 2—No LOF, LOS, or AIS failure is detected in the signal received from the network.
Sending RAI-CI terminates within 500 µs when either of the following occurs:
•
Cessation of RAI from the CI.
•
Declaration of LOF, LOS, or AIS in the signal from the network.
To prevent the transmission of RAI-CI during the failure-clearing interval of a network failure, the transition from
RAI to RAI-CI is delayed for 20 seconds following the detection of conditions 1 and 2 above. Since RAI-CI meets
the definition of RAI, it may be detected and used exactly as RAI. The longer period of time required for detection
of RAI-CI does not affect its use for functions which require RAI.
The RAI-CI pattern is a function of the payload frame format as follows:
•
ESF—The RAI-CI signal is a repetitive pattern in the Frame Bit for Data Link (FDL) with a period of 1.08
seconds. RAI-CI is formed by sequentially interleaving 0.99 (+/- 2 ms) seconds of the normal message
00000000 11111111 (right-to-left) with 90 milliseconds (+/- 2 ms) of the message 00111110 11111111
(right-to-left) to flag the signal as RAI-CI.
•
SF—The SF-RAI-CI signal is transmitted inband by setting each of the 24 channel time lots to 1000 1011
(left-to-right). In addition to the criteria specified above, the generation of SF-RAI-CI has to be held off for
1 second to examine the DS0s for a framed, all-zeros pattern. If present, the generation of SF-RAI-CI is
suspended for the duration of the all-zeros pattern.
Since the RAI to RAI-CI conversion modifies the payload, an RACI option is available to inhibit
the RAI to RAI-CI conversion for those applications that cannot tolerate payload modifications.
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ESF-RAI to SF-RAI Overwrite (ROVR) Option. If the ESF-RAI to SF-RAI Overwrite (ROVR) option is
enabled, it allows a network ESF-RAI or ESF-RAI-CI pattern to be converted into a CPE SF-RAI or SF-RAI-CI
pattern.
If the ROVR option is disabled, it prevents conversion of a network ESF payload with an embedded RAI pattern.
Disabling the ROVR option preserves the integrity of the CPE payload as it was originally transmitted.
H2TU-R DS1 Frame Conversion (CONV) Option. Frame format conversion is only applicable to the
remote H2TU-R, but selectable by the H2TU-C or H2TU-R. This option enables the network to be ESF, which is
used to embed SPRM or NPRM into the datalink towards the network. During conversion, frame bit errors are
regenerated to ensure transparency.
The HDSL2 system attempts to find ESF or SF framing or determines that no framing exists. The DS1 framing is
then synchronized with the HDSL2 frame. If the framing is lost, the system generates an Out-of-Frame (OOF)
defect which results in Unavailable Seconds - Path (UAS-P). As a result, the system reverts to frame search mode.
This option has the following settings:
•
OFF: No frame conversion takes place. All framing issues are determined by the FRMG option settings of
AUTO and UNFR.
•
ACON: This is the automatic conversion setting. If the system detects ESF from the network and SF from the
CPE, it automatically converts the CPE SF to ESF towards the network as well as the network ESF to SF
towards the CPE.
Upon power-on-reset, after loopdown, or after changing the frame conversion option, the framing needs to
be re-established before a complete conversion takes place. If there is a failure condition (LOS, AIS, or LOF)
during steady state, the previous conversion state is maintained to ensure continuity when the system returns
from the failure condition.
If SF is received from the network, the H2TU-R forces an ESF towards the network for about 1.5 seconds.
This signals to the far-end PM-NIU at the network boundary that frame conversion is requested. If the far-end
PM-NIU is capable of conversion, it changes the framing to ESF. If not, then the H2TU-R reverts to SF and
does not apply any conversion.
If an ESF is received from the CPE, it is passed on to the network, and the network’s inbound framing is
passed on to the CPE.
•
FCON: This is the forced conversion setting. Table 9 lists the HiGain HDSL2 responses to both the ACON
and FCON settings for the CONV option. The responses are identical, except in cases 3 and 4. In these cases,
the FCON reply is attempting to force the network (or the far-end PM-NIU) to send ESF. It also alerts the
CPE with an AIS alarm pattern while forcing the ESF to the network. Continuity is maintained as for ACON.
Table 10 on page 21 and Table 11 on page 21 list the ESF and SF frame formats, respectively.
Table 9.
20
Response to H2TU-R DS1 Frame Conversion Options
ACON Option
FCON Option
Case Number
NET Transmit
CPE Transmit
NET > CPE
NET < CPE
NET > CPE
NET < CPE
1
ESF
SF
2
ESF
ESF
3
SF
ESF
4
SF
SF
ESF →SF
ESF ←SF
ESF →ESF
ESF ←ESF
SF →SF
ESF ←ESF
SF →SF
SF ←SF
ESF →SF
ESF ←SF
ESF →ESF
ESF ←ESF
SF →AIS
ESF ←ESF
SF →AIS
ESF ←SF
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Table 10.
Extended SuperFrame Format
Frame Bits
Framing Pattern
Sequence (FPS) - 2 kb/s
ESF Number
Frame Bit for Datalink
(FDL) - 4 kb/s
1
m
2
3
m
Cyclical Redundancy
Check (CRC) Bits - 2 kb/s
C1
4
5
0
m
6
7
C2
m
8
9
0
m
10
11
C3
m
12
13
1
m
14
15
C4
m
16
17
0
m
18
19
C5
m
20
1
21
22
m
C6
23
24
m
1
Table 11.
SuperFrame Format
Frame Bits
SF Number
Terminal Framing Bit
1
1
2
3
0
0
4
5
0
1
6
7
1
0
8
9
1
1
10
11
1
0
12
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SuperFrame Signaling Bit
0
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Fractional T1 Mode (FT1) Option. Fractional T1 circuits can be used in feeder networks to provide frame
relay service. If such circuits are maintained by a DDS test group, then these circuits must respond to DDS/DS0
latching loopback commands, the only tool test groups have at their disposal. A latching loopback, once it has
been initiated by the correct sequence, remains locked or “latched” until the correct loopdown sequence has been
detected.
The FT1 option, when enabled by DIP switch S2 (see page 5), allows the H2TU-C to respond to DS0 latching
loopback commands and, therefore, support fractional T1 frame-relay applications. This is in addition to the
standard full bandwidth T1 2-in-5 loopup and 3-in-5 loopdown SmartJack commands. FT1 supports both the full
T1 commands of ENA and the new DDS latching loopback commands, which must also be enabled. (For more
information about latching loopback commands, refer to BellCore TA-TSY-000077, Issue 3, April 1986.)
The FT1 option supports both the DDS NI and DDS DS0 Data Port (DP) latching loopback sequences listed in
Table 12.
Table 12.
DDS NI and DS0 DP Latching Loopback Sequence
Enable Sequence
Minimum Number
of Bytes
Byte Name
Network Code
1
35
Transition in Progress (TIP)
S0111010
2A
35
NI Loop Select Code (LSC)
S1000001
2B
35
DS0 DP Loop Select Code (LSC)
S0000101
3
100
Loopback Enable Code (LBE)
S1010110
4
35
All Ones
S1111111
5
100
LBE
S1010110
6
32
Far End Voice (FEV)
S1011010
Disable/Loopdown
35
TIP
S0111010
The sequences in Table 12 are sent in time slot 1. The S in the Network Code column is a “don’t care” bit. The
loopback is activated after the detection of Sequence 6. Upon completion of the enable sequence, the Test Center
continues to transmit FEV bytes in multiples of 20 until FEV confirmation bytes are returned, or until about
2 seconds have elapsed. If the confirmation bytes are not received, a failed attempt is reported. Anticipate the
minimum number of bytes when the loopback code is transmitted by a pre-programmed machine test pattern
generator. These minimum number of bytes will most likely be exceeded when the codes are sent manually. Also,
manual testing may inject random data signals between valid control sequences. The detection algorithm ignores
these occurrences and only responds to valid control codes.
Table 13 lists the relationship between the latching loopback sequences and the specific HiGain HDSL2 loopback
they initiate.
Table 13.
HiGain HDSL2 Loopback vs. Latching Sequence
HiGain HDSL2 Loopback
Latching Sequence
NREM
1, 2A, 3, 6
NLOC
1, 2B, 3, 6
The NLOC loopback is called tandem DS0 DP loopback. It is used to select one of many loopback points when
there are several identical data ports in tandem. The NI loopback is assigned to the H2TU-R (NREM) since it is
usually located at the Network Interface (NI). The DS0 DP tandem loopback is assigned to the rest of the HiGain
HDSL2 loopbacks because most DDS test sets support this tandem command set.
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The Test Center transmits a group of 40 TIP bytes to loop down the loopback. It continues to transmit TIP bytes
in multiples of 20 until the TIP bytes are not returned or until about 2 seconds have elapsed. If the bytes are absent,
a successful loopdown is reported; otherwise, a failed loopdown is reported. The loopdown can also be initiated
by depressing the H2TU-R loopback control pushbutton or by any of the standard 3-in-5 loopdown commands.
The implemented detection or release loopback algorithm functions properly in the presence of a 10 -3 bit error
rate.
Since the FT1 mode is a combination of both the full T1 and the latching loopback modes, all codes are always
active. Therefore, if a loopback is initiated by a latching sequence, it can be looped down by either a latching or
generic loopback and vice versa. All loopback commands are completely symmetric in the FT1 mode.
If the latching sequence shown in Table 13 (page 22) is interrupted for more than 20 minutes, the detection is
cleared, and the H2TU-C reverts back to its initial state where it searches for the initial sequence 1.
After a successful latching sequence terminates in a latched loopback state, the state remains until the Disable
command is detected, or until the LBTO option of NONE, 20, 60, or 120 minutes has expired, whichever occurs
first.
The unframed AIS pattern that is normally sent towards the network for a CI LOS fault condition must be replaced
by the new patterns listed in Table 14 when the FT1 loopback option is selected.
Table 14.
Response of H2TU-C and H2TU-R to LOS and AIS
H2TU-C Output Pattern
Case
FT1
Option
H2TU-C
Input
Framing
Payload
FDL
H2TU-R
Input
H2TU-R
Output
1
ENA
SF
SF
01111110
N/A
LOS/AIS
AIS
RCV
RLOS/RAIS
XMT IDLE
2
ENA
ESF
ESF
01111110
X
LOS/AIS
AIS
RCV
RLOS/RAIS
XMT IDLE
3
ENA
LOS/AIS
UNFR
01111110
N/A
LOS/AIS
AIS
RCV
RLOS/RAIS
XMT IDLE
4
ENA
LOS/AIS
SF
PL
X (a)
SF/PL
AIS
RCV LLOS/LAIS
5
ENA
LOS/AIS
ESF
PL
X (a)
ESF/PL
AIS
RCV LLOS/LAIS
(a)
Status Screen
(a) Don’t care bit.
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Provisioning
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Resetting to Factory Defaults
To reset the H2TU-C to its original factory defaults:
1
Press
2
Use the
↑
3
Press
to reset the H2TU-C or press
C
Y
to select the Config menu.
and
↓
arrow keys to select Set Factory Defaults (see Figure 10), then press
N
ENTER .
to cancel this action.
Resetting the H2TU-C to its original factory settings may cause interruption of service.
Only software configurable options will be set to factory defaults; hardware configurable
options must be manually set to factory defaults using DIP switch S2 (see page 5).
Figure 10.
24
Config Menu - Set Factory Defaults
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Provisioning
Clearing the History, Alarm, and Event Log Screens
Select Master Clear to clear the History, Alarm, and Event Log screens after the system has been installed and is
functioning properly. This removes miscellaneous data acquired during the start-up session and ensures that you
have meaningful data thereafter.
To clear the Event Log, press
E
to select the Event Log screen, then press
L
to clear the screen.
To clear an individual history or alarm screen, do the following:
1
Press
2
Press the SPACEBAR to select either interface (H2TU-C DS1, H2TU-R DS1, H2TU-C HDSL2, or
H2TU-R HDSL2), then press ENTER .
3
Press
4
Press the SPACEBAR to select the type of statistics (Current, Alarm History, 25-Hour History,
48-Hour History, or 31-Day History), and press ENTER after your selection.
P
↓
to select the Performance screen.
to select statistics.
–
Selecting 31-Day History allows you to clear the current, 25-hour, 48-hour, and 31-day
performance history screens for the selected interface.
–
Selecting Alarm History allows you to clear the alarm history screen for the selected interface. For
information about the DS1 and HDSL2 Alarm screens, see Table 16 on page 31 and Table 17 on
page 34, respectively.
5
Press
L
to clear the screen.
6
Press
Y
to confirm.
To clear ALL history, alarm, and event log screens by this method:
1
Press
2
Use the
3
Press
ENTER
4
Press
Y
C
to select the Config screen.
↑
and
↓
arrow keys to select Master Clear (see Figure 11).
to activate.
to clear all screens.
Figure 11.
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MONITORING SYSTEM ACTIVITY AND
PERFORMANCE
The HDSL2 system provides the following maintenance screens for monitoring system activity and assessing
performance.
•
The Monitor screen provides a graphical representation of circuit activity and allow initiation of loopbacks.
•
The Performance screens provide current, 25-hour, 48-hour, and 31-day performance histories and a
continuous alarm history.
•
The Event Log provides a description of the 100 most recent events, which include their origin, time and date
of occurrence, and message.
USING THE MONITOR SCREEN TO VIEW SYSTEM ACTIVITY
DS1 errors
Margin
Line code and framing
Figure 12.
1
Press
M
Loop attenuation
Active loopback
Insertion loss
Alarm type
HDSL2 errors
System status
Monitor Screen - Active Loopback with Alarms
to view the system diagram.
Figure 12 shows an armed circuit with an active loopback and alarms. Terms used on the system diagram are
defined in the onscreen Help menu glossary. Abnormal situations are highlighted on the diagram. Table 15
on page 27 describes the screen fields.
2
To initiate a loopback, press the
your choice.
SPACEBAR
to cycle through the loopback choices. Press
ENTER
to make
When prompted with the message: Are you sure (Y/N)?, press Y to initiate the loopback or
cancel. For more information about loopbacks, see “Testing” beginning on page 43.
26
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to
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To initiate a loopdown of all active loopbacks, press the SPACEBAR to select LPDN, then press ENTER .
When prompted with the message: Are you sure (Y/N)?, press Y to initiate the loopdown or N to
cancel.
Table 15.
Monitor Screen Descriptions
Field
Description
Active Loopback
An active loopback is indicated on the lower third of the Monitor screen. Available loopbacks are
indicated by gray text. See Table 24 on page 48 for a summary of the HDSL2 generic loopback
codes and activation methods.
Alarm Type
Indicates type of alarm. See Table 23 on page 43 for a summary of system alarms.
Code Type
Type of DS1 line coding received or sent (B8ZS or AMI).
DS1 ES Count
Errored Seconds—The sum of the Errored Seconds-Line (ES-L) and Errored Seconds-Path (ES-P)
counts detected on the DS1 input over a 24-hour period. Errors include DS1 frame errors, BPV,
and ESF CRC errors.
DS1 SES Count
Severely Errored Seconds—The sum of the DS1 Severely Errored Seconds-Line (SES-L) and
Severely Errored Seconds-Path (SES-P) counts over the last 24 hours.
DS1 UAS Count
Unavailable Seconds—The number of seconds during which the DS1 input signal was absent over
a 24-hour period.
Frame Type
Type of DS1 framing detected at the input stream (SF, ESF, or UNFR).
HDSL2 ES Count
Errored Seconds—The number of 1-second intervals that contained at least one CRC or LOSW
error. This value is a running total of the last 24 Hours.
HDSL2 SES Count
Severely Errored Seconds—The number of 1-second intervals that contain at least 50 CRC errors
or one or more LOSW defects. An LOSW defect occurs when at least three consecutive HDSL
frames contain one or more frame bit errors. This value is a running total of the last 24-hours.
HDSL2 UAS Count
Unavailable Seconds—The number of seconds the HDSL2 loop is unavailable. This occurs after
10 contiguous HDSL SES and is retired after 10 contiguous non-SES seconds. This value is a
running total of the last 24 hours.
HG or (PL)
HG displays when the loopback was initiated from a HiGain (HG) front panel or by a maintenance
terminal loopback command. PL displays when the loopback was initiated by a command
embedded in the DS1 data path payload (PL).
ID
Circuit identification number.
INSL
Insertion Loss—The signal loss value for a 196 kHz signal over the cable.
LA
Loop Attenuation—Indicates the attenuation of the Overlapped Pulse Amplitude Modulation
Transmission with Interlocking Spectra (OPTIS) pulse from the distant end. The value is related to
insertion loss at 196 kHz and should be kept under 28 dB. This value differs from the insertion loss
value of a conventional 196 kHz signal.
LPF
Line Power Feed—Indicates the HDSL2 line power is on.
M
Margin—The signal-to-noise ratio at all HDSL2 ports, relative to a 10-7 Bit Error Rate.
MAL
Margin Alarm—Indicates the margin on HDSL2 loop has dropped below the threshold (0 to 15 dB)
set by the operator.
PRM
The sum of the Performance Report Messaging - Near End (PRM-NE) and Performance Report
Messaging - Far End (PRM-FE) counts.
System Status
The presence or absence of an alarm condition is indicated on the lower right corner of all screens.
System: OK indicates that there are no alarms present; System: Alarm indicates the presence of
an alarm. Refer to “Using the Performance Screens to View Alarm Data” on page 34.
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USING THE PERFORMANCE SCREENS TO VIEW PERFORMANCE DATA
The Performance screens display:
•
CRC statistics for the HDSL2 or DS1 interface in 31-day, 48-hour, 25-hour, and current history reports.
•
Alarm statistics for the DS1 interfaces (Figure 22 on page 35 and Figure 23 on page 35) or HDSL2 interfaces
(Figure 24 on page 37) on a continuous basis.
To access the Performance history screens:
1
Press
2
Press the SPACEBAR to select either interface (H2TU-C DS1, H2TU-R DS1, H2TU-C HDSL2, or H2TU-R
HDSL2), then press ENTER .
3
Press the SPACEBAR to select the type of statistics (Current, Alarm History, 25-Hour History, 48-Hour
History, or 31-Day History), then press ENTER .
P
to select the Performance screen.
Performance History at the DS1 Interface
The Performance History for the DS1 Interface provides a 31-day, 48-hour, 25-hour, and current statistics screens
for the H2TU-C and H2TU-R (as viewed from the H2TU-C). To gain access to the Blockage Indicator History
screen, you must be logged on remotely. See “Using the Performance Screens to View Performance Data” on this
page for logon procedures.
Figure 13 below and Figure 15 on page 29 are examples of DS1 performance history screens at the remote unit.
Figure 14 on page 29 is an example of DS1 performance history screen at the line unit. Refer to Table 16 on
page 31 for descriptions of the errors reported on DS1 interface screens. Asterisks indicate performance
monitoring from the previous day.
Figure 16 on page 30 and Figure 17 on page 30 show statistics for the DS1 interface at the remote unit and line
unit, respectively. These screens report 1-day, 1-hour, and 15-minute statistics.
Figure 13.
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H2TU-R DS1 31-Day Performance History
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Figure 14.
H2TU-C DS1 48-Hour Performance History
Figure 15.
H2TU-R DS1 25-Hour Performance History
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Figure 16.
H2TU-R DS1 Current Statistics
Figure 17.
H2TU-C DS1 Current Statistics
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Table 16.
Error
Acronym
Error Acronyms Used on the DS1 Performance History Screens
Description
Error
Acronym
Description
CV-L
Code Violation - Line (a)
Total BPV count.
SES-P
Severely Errored Seconds - Path
Seconds with SES, CRC (ESF) ≥ 320, or
FE (b) (SF) ≥ 8 (FT + FS).
ES-L
Errored Seconds - Line
Seconds with BPV ≥ 1.
UAS-P
Unavailable Seconds - Path
A second of unavailability based on SES-P or
AIS ≥ 1.
SES-L
Severely Errored Seconds - Line
Seconds with BPV plus EXZ ≥ 1544 or
LOS ≥ 1.
PRM-NE (c)
Performance Report Monitoring - Near End
The PRM registers in the ESF/FDL from CPE
indicate errors, and the signal received from the
network at the remote is error-free.
UAS-L
Unavailable Seconds - Line
Seconds with LOS ≥ 1.
PRM-FE (c)
Performance Report Monitoring - Far End
The PRM registers in the ESF/FDL from the network
indicate errors, and the signal received from the
CPE is error-free.
PDVS-L
Pulse Density Violation Seconds - Line
Seconds with excessive zeros
(AMI = 16 zeros, B8ZS = 8 zeros).
B8ZSS (d)
B8ZS Monitored Seconds
Seconds with B8ZS detection when AMI option is
active.
ES-P
Errored Seconds - Path (e)
Seconds with SEF (f), CRC (ESF), or
FE (SF) ≥ 1.
MSEC (d)
Monitored Seconds of the current
(15-minute/1-hour/1-day) screen.
(a)
(b)
(c)
(d)
(e)
(f)
Line (L) refers to the AMI DS1 line used to transport the payload.
FE is a frame bit error.
Appears on H2TU-R Performance History screens.
Appears on the DS1 Current Statistics screens.
Path (P) refers to the total framed payload being transported between two points.
Severely Errored Frame—Two or more frame bit errors occurring in a 0.75 ms interval for SF or a 3 ms interval for ESF.
Performance History at the HDSL2 Interface
The HDSL2 interface has 31-day, 48-hour, 25-hour, and current statistic screens for the H2TU-C. Figure 18 and
Figure 19 on page 32 are examples of 31-day and 48-hour performance history screens. Figure 20 and Figure 21
on page 33 are examples of 25-hour and current statistics performance history screens. Refer to Table 17 on
page 34 for descriptions of the kinds of errors reported on all HDSL2 performance screens. Asterisks indicate
performance monitoring from the previous day.
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Figure 18.
H2TU-C HDSL2 31-Day Performance History
Figure 19.
H2TU-C HDSL2 48-Hour Performance History
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Figure 20.
H2TU-C HDSL2 25-Hour Performance History
Figure 21. H2TU-C HDSL2 Current Statistics
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Table 17.
LTPH-UM-1170-01
Error Acronyms Used on the HDSL2 Performance History Screens
Error Acronym
Description
CV
Code Violation
Total count of HDSL2 CRC errors.
ES
Errored Seconds
Seconds with HDSL2 CRC ≥ 1 or LOSW ≥ 1
SES
Severely Errored Seconds
Seconds with HDSL2 CRC ≥ 50 or LOSW ≥ 1
UAS
Unavailable Seconds
Based on 10 contiguous SES occurrences
LOSWS
Loss of Sync Word Second
Seconds with LOSW ≥ 1
USING THE PERFORMANCE SCREENS TO VIEW ALARM DATA
To access the alarm history screens:
P
1
Press
to select the Performance screen.
2
Press the SPACEBAR to select an interface (H2TU-C DS1, H2TU-R DS1, H2TU-C HDSL2, or H2TU-R
HDSL2), then press ENTER .
3
Press the
4
Press
N
or
5
Press
L
to clear the selected alarm history screen.
SPACEBAR
P
until Alarm History is selected, then press
ENTER .
to page through the alarm history screens.
Alarm History at the DS1 Interface
The Alarm History screen reports on a continuous basis the DS1 statistics for the H2TU-C (Figure 22 on page 35)
and the H2TU-R (Figure 23 on page 35). The types of alarms reported are described in Table 17 on page 34.
Current alarms are shown in reverse video.
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Figure 22.
H2TU-C DS1 Alarm History Screen
Figure 23.
H2TU-R DS1 Alarm History Screen
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Table 18.
Message on Screen
DS1 Alarm Descriptions
Description
H2TU-C DS1 Alarms (see Figure 22 on page 35)
LLOS (a)
Line (Unit) Loss of Signal—Loss of the H2TU-C DSX-1 input signal.
LAIS
Line Alarm Indication Signal—Indicates an AIS (all ones) pattern is being transmitted from the local DS1
output port. The ALMP option determines whether AIS (default) or LOS is sent toward the CPE.
DBER
Bit Error Rate—The DS1 BER has exceeded the built-in 24-hour threshold limits of approximately 10-6.
LOF
Loss of Frame—Indicates the incoming DS1 payload does not contain the specific frame pattern, ESF or
SF, selected by the FRMG option. Only occurs if the FRMG option is set to SF or ESF.
H2TU-R DS1 Alarms (see Figure 23 on page 35)
RLOS (a)
Remote (Unit) Loss of Signal—Loss of the H2TU-R DS1 input signal.
RAIS
Remote Alarm Indication Signal—Indicates an AIS (all ones) pattern is being received at the H2TU-R DS1
input port. By default AIS-CI (b) is sent toward the network. See Figure 27 on page 44.
RAI
Remote RAI - Remote Alarm Indication at the H2TU-R—Indicates an RAI alarm (yellow) from the CPE with
errors from the line unit or network.
TX RAI-CI
Transmit RAI-CI - Remote Alarm Indication at the H2TU-R—Upon reception of an RAI (yellow) from the
CPE, the H2TU-R sends an RAI-CI toward the network if the network signal received at the H2TU-R is clear.
If the network signal is impaired (LOS, AIS, or LOF), then the RAI is passed on to the network unaltered.
This is applicable to SF or ESF framing. In an all SF environment, RACI must be enabled to convert SF-RAI
to SF-RAI-CI.
PRM-NE
Performance Report Monitoring - Near End—The count of the PRM-NE register at the H2TU-R exceeds
the 10-6 BER threshold at 648 events since 12:00:00 AM.
PRM-FE
Performance Report Monitoring - Far End—The count of the PRM-FE register at the H2TU-R exceeds the
10-6 BER threshold at 648 events since 12:00:00 AM.
DBER
Bit Error Rate—The DS1 BER has exceeded the built-in 24-hour threshold limits of approximately 10-6.
LOF
Loss of Frame—Indicates the incoming DS1 payload does not contain the specific frame pattern, ESF or
SF, selected by the FRMG option. Only occurs if the FRMG option is set to SF or ESF.
(a) This is a DS1-specific alarm that also issues a minor alarm (sent to the management unit or the backplane), if enabled.
(b) AIS-CI is a modified AIS alarm pattern. Equipment not suited to detect AIS-CI still detects this signal as an AIS. AIS-CI is sent
toward the network indicating that an LOS (RLOS) or AIS (RAIS) has been received from the CPE.
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Alarm History at the HDSL2 Interface
The HDSL2 Alarm History screens report alarms at the H2TU-C and the H2TU-R. Figure 24 shows the H2TU-C
HDSL2 alarm history. Table 19 describes the alarms that are reported at the H2TU-C or H2TU-R.
Figure 24.
H2TU-C HDSL2 Alarm History Screen
Table 19.
Message on Screen
HDSL2 Alarm Descriptions
Description
HDSL2 Alarms at the H2TU-C and H2TU-R
LOSW
Loss of Sync Word—The HDSL2 loop has lost synchronization.
MAL
Margin—The margin on the HDSL2 loop has dropped below the minimum threshold value set for the
system.
LA
Loop Attenuation—The attenuation on the HDSL2 loop has exceeded the maximum value set for the
HDSL2 loop attenuation threshold. (xxx denotes either TUC or TUR.)
HBER
Block Error Rate—The HDSL2 BER has exceeded the set threshold limits of
10-6 or 10- 7.
HDSL2 Alarms at the H2TU-C only
SHORT
A short between the Tip and Ring of the HDSL2 pair is present.
GND
The HDSL2 loop is grounded.
OPEN
A line power open condition is present.
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USING THE SYSTEM EVENT LOG TO TRACK EVENTS
The System Event Log screen (Figure 25) displays 100 of the most recent events (most recent event displayed
first) and provides the following information:
•
Origin tags to identify the source of a Write entry (see “Origin Tags” on page 40)
•
Date and time
•
Event log messages (see Table 20 on page 39)
To view a running log of system events, press
•
Press
N
or
•
Press
T
to return to the top of the log.
•
Press
L
to clear the event log.
P
E
to page through the event log.
Figure 25.
38
to select the Event Log.
System Event Log
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Event Log Messages
Table 20 lists all the possible messages that can be displayed by the System Event Log screen.
Table 20.
Event Log Entry Messages
Any DS1 Alarm History reset
Any DS1 PM register reset
Any HDSL2 Alarm History reset
Any HDSL2 PM register reset
Any Loop Down (any segment)
Any Loop Up (any segment)
Any provisioning option change: <provisioning mnemonic>: changed from <old> to <new>
CPE DBER alarm (1-day threshold crossed of any PM data except PRM-NE or PRM-FE)
CPE DS1 AIS begins/ends
CPE DS1 LOS begins/ends
CPE PRM-NE BER alarm (at the remote only: 1-day threshold crossed of PRM-NE: trouble on CPE receive)
Current statistics reset
Event Log reset
H2TU-C Power up/down
H2TU-R Power up/down
HDSL2 DC pair open begins/ends on any segment
HDSL2 Ground fault begins/ends on any segment
HDSL2 HBER alarm (threshold crossed) on any segment.
HDSL2 loop attenuation (threshold crossed) on any HDSL2 interface
HDSL2 margin alarm (threshold crossed) on any HDSL2 interface
HDSL2 unavailability begins/ends on any segment
Master zero reset
NTWK DBER alarm (1-day threshold crossed of any PM data)
NTWK DS1 LOS begins/ends
NTWK PRM-FE BER alarm (at the remote only: 1-day threshold crossed of PRM-FE: trouble on NTWK far end)
NTWK DS1 AIS begins/ends
Power Feed Open begins/ends
Power Feed Short begins/ends
RAI begins/ends
TX RAI-CI begins/ends (RAI-CI sent from the remote towards the network)
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Origin Tags
The origin tags identify the source of all Write entries and how an event occurred. The exact meaning is dependent
on the type of event and the unit reporting the event. A Write entry changes a system parameter or an option
setting, but it does not affect circuit status changes, such as alarms. Table 21 lists the various origin tags and their
definitions.
Table 21.
Origin Tag
Origin Tags
Description
Provisioning changes initiated at the line unit (logged on to the line unit)
LU Craft Port
Event was initiated from the RS-232 craft port located on the H2TU-C front panel.
Management Host
Event was initiated from a host management unit, such as an HMU-319, that sent a command over
the management bus on the H2TU-C shelf backplane.
Provisioning changes initiated at the line unit (logged on to the remote unit)
Line Unit
This generic origin tag can only occur when viewing the Event Log screen at the remote unit. It is a
general indication that the event was initiated at the line unit. The Event Log screen must then be
viewed at the line unit (through an Rlogon command) for more specific origin information.
Provisioning changes initiated at the remote unit (logged on to the remote unit)
RU Front Panel
Event was initiated from the front-panel pushbutton(s) on the H2TU-R.
RU Craft Port
Event was initiated from the RS-232 craft port located on the H2TU-R front panel.
TL1 Command
Event was initiated by a non-intrusive TL1 command embedded in the FDL of the ESF DS1 signal
received by the HDSL2 circuit.
Provisioning changes initiated at the remote unit (logged on to the line unit)
Remote Unit
This generic origin tag can only occur when viewing the Event Log screen at the line unit. It is a general
indication that the event was initiated at the remote unit. The Event Log screen must then be viewed
at the remote unit (through an Rlogon command) for more specific origin information.
Loopback commands
Remote Unit
Implies that the loopback command was initiated at the remote unit by the front-panel pushbuttons,
craft port, or in the remote unit’s DS1 input payload. A loopback initiated from a terminal would have
a Remote Unit tag if the initiating terminal is in a remote logon session.
Line Unit
Implies that the loopback command was initiated at the line unit by the craft port or in the line unit’s
DSX-1 input payload.
Alarms
Remote Unit
Indicates that the alarm occurred at the remote unit.
Line Unit
Indicates that the alarm occurred at the line unit. LOSW, SHORT, GND, and OPEN are always tagged
as line unit alarms.
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USING THE REPORT MENU
The Report menu (Figure 26) provides screens containing status and performance monitoring data for line and
remote units which can be downloaded to a file for analysis or future reference. Table 22 on page 42 describes the
four types of reports provided by the Report menu.
To select each individual report, do the following:
1
Press
2
Press the
O
to select Report menu.
SPACEBAR
to select a report type and print mode.
–
Continuous Print Mode generates a non-stop version of the report.
–
Page Mode generates a page-by-page version of the report for easy viewing on the screen.
3
Use your terminal emulation software (HyperTerminal or Procomm) to capture the selected report to your
printer. Press ENTER to generate. (If Page Mode is selected, press the SPACEBAR to continue or ESC to quit.)
4
End the captured report.
5
Press
CTRL
+
R
to refresh the Report menu screen.
Figure 26.
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Report Menu - Full Report
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Table 22.
Type
Full Report
Report Types
Contains the following information:
• Circuit and unit identifications
• Product information
• System configuration
• Current performance statistics
• Alarm history
• Performance history
Short Report
• System event log
• Product information
• System configuration
• Current performance statistics
System Information Report
• Circuit and unit identification
• Circuit and unit identifications
• Product information
Event Report
• System configuration
• Circuit and unit identifications
• Product information
• System event log
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Testing
TESTING
This section provides information about system alarms, LOS and AIS response, OCT55 test procedure, and
loopback testing.
SYSTEM ALARMS
Table 23 provides a summary of the system alarms displayed on the H2TU-C alarm history screens (see “Using
the Performance Screens to View Alarm Data” on page 34).
Table 23.
System Alarms Summary
Message on Screen
Alarm
Description
To Inhibit
SHORT
Power Feed Short
A short exists between the Tip and Ring of
the HDSL2 pair.
Cannot be inhibited.
GROUND
Power Feed Ground
The HDSL2 loop is grounded.
Cannot be inhibited.
OPEN
Power Feed Open
A line power open condition exists.
Cannot be inhibited.
LOSW
Loss of Sync Word
The HDSL2 loop has lost synchronization.
Cannot be inhibited.
LLOS
Line (Unit) Loss of Signal
Loss of the DSX-1 input signal.
Cannot be inhibited.
RLOS
Remote (Unit) Loss of
Signal
Loss of the H2TU-R DS1 input signal.
Cannot be inhibited.
LAIS
Line Alarm Indication Signal Indicates an AIS (unframed all ones) pattern
is being received at the H2TU-C DS1 input
port.
Cannot be inhibited.
RAIS
Remote Alarm Indication
Signal
Indicates an AIS (unframed all ones) pattern
is being received at the H2TU-R DS1 input
port.
Cannot be inhibited.
TX RAI-CI
Transmit RAI-CI—Remote
Alarm Indication at the
H2TU-R
Upon reception of an RAI (yellow) from the
CPE, the H2TU-R sends RAI-CI toward the
network if the network signal received at the
H2TU-R is clear.
If the network signal is impaired (LOS, AIS,
or LOF), then the RAI is passed on to the
network unaltered.
Cannot be inhibited.
RAI
Remote RAI—Remote
Alarm Indication at the
H2TU-R
Indicates an RAI alarm (yellow) from the CPE
with errors from the line unit or network.
Cannot be inhibited.
DBER
DS1 Bit Error Rate
The DS1 BER has exceeded the set threshold
limits of approximately 10-6.
Select DIS for the DBER
system option.
PRM-FE
Performance Report
Messaging - Far End
Indicates H2TU-R PRM-FE BER threshold is
exceeded.
Set DBER threshold to DIS.
PRM-NE
Performance Report
Messaging - Near End
Indicates H2TU-R PRM-NE BER threshold is
exceeded.
Set DBER threshold to DIS.
HBER
HDSL2 Block Error Rate
The HDSL2 BER has exceeded the set
threshold limits of 10-6 or 10- 7.
Select NONE for the HBER
system option.
MAL
Margin Alarm
The margin on the HDSL2 loop has dropped
below the minimum threshold value set for
the system.
Set the Margin Alarm
Threshold option to 0 (zero).
LA
Loop Attenuation
The attenuation on the HDSL2 loop has
exceeded the maximum value set for the
HDSL2 loop attenuation threshold.
Set the HDSL2 Loop
Attenuation Threshold option
to zero.
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Testing
LTPH-UM-1170-01
Alarm Option for the Digital Loop Carrier Feed
To improve HDSL2 compatibility with the switch-to-protect features used in Digital Loop Carrier (DLC) feeder
applications, the H2TU-C has an Alarm Pattern (ALMP) option that allows either AIS or LOS DS1 output payload
selection for the following alarms:
•
LOSW on any loop
•
LOS DS1
Remote LOS and AIS Response
Figure 27 shows the different ways the HDSL2 can respond to the network, depending on the configuration of the
TLOS, NLBP, FT1, ALMP, and NAIS configuration options described in Table 6 on page 15 and Table 7 on
page 16.
H2TU-R, DS1 Input
LOS event?
YES
NO
TLOS
[ENA]
Loopback to Network
[DIS]
Remove alarm
pattern
NO
AIS event?
NLBP
YES
[LOS]
LOS to CPE
[AIS]
AIS to CPE
[ENA]
FT1
FT1 idle to NET & CPE
[DIS]
ADC Option
ALMP
Standard Option
Default configurations
are in bold.
[LOS]
Pass on LOS to NET
[AIS]
NAIS
[AIS]
Send AIS to NET
[CI]
Send AIS-CI to NET
H0029-A
Figure 27.
44
H2TU-R LOS and AIS Response Priorities
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Testing
OCT55 TEST PATTERN WITH AMI LINE CODE
The OCT55 test pattern can be used in unframed mode to stress the system and verify data integrity. In an SF or
ESF framing mode, excessive zero anomalies may occur, which causes the H2TU-C to report ES, SES, and UAS
errors according to ANSI T1.231-1997.
LOOPBACK OPERATION
HiGain HDSL2 has a variety of loopback options for analyzing circuit functionality. The loopback signal is
transmitted and returned to the sending device for comparison. This allows you to verify the integrity of the
HDSL2 channels to the H2TU-C, the H2TU-C DSX-1 interface, and the DS1 channels to the customer.
Loopback commands can be initiated by:
•
Entering the loopback code into the test equipment connected to the H2TU-C or H2TU-R.
•
Selecting the loopback type from the Monitor menu when connected to the H2TU-C or H2TU-R (see
“Loopback Testing Using a Maintenance Terminal” on page 50).
•
Using the loopback pushbuttons (LLB and RLB) on the H2TU-R (see “Loopback Testing Using Remote Unit
Front-Panel Pushbuttons” on page 50).
•
Special loopback modes:
–
Generic Mode Loopback (GNLB) commands, including the SmartJack (SMJK) option (see “GNLB
Mode Loopback Commands” on page 46).
–
A3LB Mode Addressable Repeater Loopback commands (see “A3LB Mode Loopback Commands” on
page 46).
HiGain supports multiple loopbacks, but a single loopback is the preferred method.
Activate loopback using DSX-1
one of the following:
• Maintenance terminal
• Test set
NLOC
DS1
NREM
SMJK
TLOS*
CREM
H2TU-C
CLOC
H2TU-R
Downstream
Network
H0031-A
Upstream
* When enabled, TLOS is an automatic loopback
that occurs with an LOS at the remote DS1 input.
Figure 28.
H2TU-C-202 List 4G
Activate loopback using
one of the following:
• Loopback pushbuttons
• Maintenance terminal
• Test set
Customer
Premises
Loopback Summary
November 8, 2002
45
Testing
LTPH-UM-1170-01
SPECIAL LOOPBACK (SPLB) MODE
The HDSL2 system can be configured from the ADC Options menu for one of two SPLB modes, GNLB or A3LB.
These modes permit the HDSL2 system to respond to the loopback commands described in the following
paragraphs.
GNLB Mode Loopback Commands
The GNLB (Generic Loopback) commands allow the use of inband codes to loop up either NLOC (4-in-7) or
NREM (3-in-7) towards the network. Additionally, these inband codes loop up CREM (6-in-7) or CLOC (5-in-7)
towards the customer. Either loopup condition can be terminated (looped down) with the 3-in-5, SMJK loopdown
code. All inband codes must be present for at least 5 seconds before the HDSL2 system responds. TLOS is a logic
loopback caused by loss of the DS1 input from the CI.
Figure 28 on page 45 summarizes the available loopbacks in the system, and Table 24 on page 48 summarizes the
HDSL2 generic loopback commands. See “GNLB Test Procedures” on page 48 for the test procedures that apply
when using the GNLB Special Loopback Mode.
HiGain systems feature the SmartJack option which can emulate a Network Interface Device
(NID) for loopback testing of the HDSL2 circuit. SMJK and NREM loopbacks perform the same
functions, but their initiation differs. SMJK indicates that the loopback was initiated by the 2-in-5
inband command. Conversely, NREM is initiated by the 3-in-7 inband command, or by a
command issued from the maintenance terminal.
Use the inband commands to enable or disable the SMJK loopback options. The HDSL2 system
setting is normally enabled to recognize all inband SmartJack loopback commands.
A3LB Mode Loopback Commands
A3LB loopback commands can be sent by a test set connected to the H2TU-C or H2TU-R. See Table 25 on
page 50 for a list of the commands.
A3LB is a special, addressable, repeater loopback mode which is supported by the H2TU-C. This loopback mode
provides the HDSL2 system with sophisticated maintenance and troubleshooting tools. A3LB is patterned after
the Westell addressable T1 repeater loopbacks.
A3LB supports the additional (1-in-6) SMJK loopback command.
SMJK loopback commands are activated only by inband commands.
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Testing
LOOPBACK TEST PROCEDURES
The following sections provide step-by-step test procedures for verifying the integrity of the HDSL2 channels at
every module location as well as the DS1 channels to the customer and the local DSX-1 interface.
General Troubleshooting Tips
If trouble is encountered on the DSX-1 interfaces of the H2TU-C, verify that the:
•
H2TU-C is making a positive connection with its mounting assembly (shelf) connector.
•
H2TU-C internal equalizer is set to the correct distance range per Table 6 on page 15. All equalizers should
be set to the distance from the DSX-1 to the shelf.
Loopback Timeout Option
Before activating any loopback, verify that the 120-minute Loopback Timeout option (LBTO) is either enabled
or disabled. Table 6 on page 15 describes this option, which is set by DIP switch S2 (see “On-board DIP Switch
S2” on page 5).
All loopbacks can be initiated by inband commands in the DS1 payload. Loopbacks can also be initiated by a
command from the HDSL2 system using maintenance screen selections. Whenever a loopback is active, the
method by which it was activated is indicated in the Loopback and Status screens by the annotation HG or PL
adjacent to the identified loopback. For example, NREM-HG indicates that the loopback was initiated by the
HDSL2 system. NREM-PL indicates that the loopback was initiated by inband commands.
Once activated, a loopback stays active until it times out at the 120-minute LBTO setting or until a loopdown
command is executed to terminate the loopback. When a loopback terminates, the display returns to its normal
display mode.
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47
Testing
LTPH-UM-1170-01
GNLB Test Procedures
Figure 29 on page 49 is a graphical representation of the various loopback configurations with the associated
GNLB commands shown. Table 24 summarizes the codes required to execute GNLB loopback commands. All
code sequences must be present for at least 5 seconds.
To perform the GNLB loopback test procedure:
1
Have the CO tester send the NREM (3-in-7) inband loopup code for 5 seconds. The RLB/LLB LED on the
H2TU-R front panel should be green, and the loopback mode should also be identified on the Monitor screen.
2
Have the CO tester transmit a DS1 test signal toward the H2TU-C and verify that the returned (looped) signal
to the test set is error-free.
3
If Step 2 fails, have the CO tester transmit the (3-in-5) inband loopdown code.
4
Have the CO tester send the NLOC (4-in-7) inband loopup for 5 seconds. The RLB/LLB LED on the H2TU-R
front panel should be yellow, and the loopback mode should also be identified on the Monitor screen.
5
Repeat Step 2. If the test passes, the problem is in the downstream direction. If it fails, the problem is in the
upstream direction.
Table 24.
Summary of HDSL2 Generic Loopback Codes and Activation Methods
Method of Activation
Loopback
Code
Description
Test Set
Craft Port
NLOC
1111000
4-in-7
DSX-1 signal is looped back to the network at the H2TU-C.
X
X
NREM
1110000
3-in-7
DSX-1 signal is looped back to the network at the H2TU-R.
X
X
CLOC
1111100
5-in-7
DS1 signal from the customer is looped back to the customer at the
H2TU-R.
X
X
CREM
1111110
6-in-7
DS1 signal from the customer is looped back to the customer at the
H2TU-C.
X
X
SMJK LpUp
(PL) (a)
11000
2-in-5
SmartJack Loopup or NID payload (PL) code. Invokes H2TU-R
loopback toward network.
X
SMJK LpUp
(ESF-DL) (a)
1111-11110100-1000
SmartJack Loopup or NID (ESF-DL) code. Invokes H2TU-R loopback
toward network.
X
SMJK LpDn
(PL)
11100
3-in-5
SmartJack Loopdown or NID payload (PL) code. Removes SMJK,
NLOC, NREM, CLOC, and CREM.
X
SMJK LpDn
(ESF-DL)
1111-11110010-0100
SmartJack Loopdown or NID (ESF-DL) code. Removes SMJK, NLOC,
NREM, CLOC, and CREM.
X
SMJK LpUp (a)
100000
1-in-6
SmartJack Loopup code from the network. Invokes H2TU-R
loopback towards network.
X
SMJK LpDn
100
1-in-3
SmartJack Loopdown code from the network or customer interfaces.
Removes any loopback in the system.
X
(a) This loopback command is valid only when the SmartJack Loopback (LPBK) option is ENABLED.
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Testing
Loopbacks Toward Network
TLOS*
HRU-412
LOGIC
HRU-412
HDSL2 SPAN
HLU
H2TU-C
All ones
H2TU-R
SMJK*
HDSL2 SPAN
H2TU-C
HLU
11000
HRU-412
2-in-5
HRU-412
All ones
H2TU-R
SMJK*
HDSL2 SPAN
H2TU-C
HLU
100000
HRU-412
1-in-6
HRU-412
All ones
H2TU-R
FF02 =
H2TU-C
HLU
HDSL2 SPAN
1110000
NREM*
NREM
HRU-412
33-in-7
in 7
HRU-412
All ones
NLOC
DSX-1
4-in-7
HLU
1111000
CLOC
HRU-412
H2TU-R
5 IN 7 All ones
HDSL2 SPAN
HRU-412
H2TU-C
CREM
HLU
6-in-7
All ones
3F1E =
1111110
Loopbacks Toward Customer
HDSL2 SPAN
H2TU-R
CI-Customer Interface
HRU-412
H2TU-R
FF1E =
H2TU-C
3F02 =
HLU
All ones H2TU-C
HDSL2 SPAN
1111100
CLOC
HRU-412
5 IN 7
5-in-7
H2TU-R
HRU-412
RLB
HLU
Loopbacks From H2TU-R Front Panel
LLB
HDSL2 SPAN
H2TU-R
H2TU-C
* Set the NLBP option to AIS to send AIS (indicated by an all ones pattern) for any network loopback.
= A3LB loopback code.
GNLB loopback codes.
Figure 29.
H0033-A
Loopback Modes
A3LB Test Procedures
Figure 29 on page 49 is a graphical representation of the various loopback configurations with the associated
A3LB commands shown.
The H2TU-C can be looped back by sending the Addressable Office Repeater (AOR) LPBK activation code
1111-1111-0001-1110 (FF1E) for at least 5 seconds. This causes the H2TU-C to enter the NLOC state. The
Loopback Time-Out setting determines the duration of this loopback unless it is overridden by the reception of a
second identical 16-bit loopup command before the timer expires. When this time-out override state exists, the
only method to loop the H2TU-C down is to issue one of the three loopdown commands listed in Table 25. The
automatic time-out mode is restored during subsequent loopback sessions.
Table 25 on page 50 summarizes the codes required to execute Addressable 3 (A3LB) repeater loopback
commands. All code sequences must be present for at least 5 seconds.
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Testing
LTPH-UM-1170-01
Table 25. Addressable Repeater Loopback Commands (A3LB)
Name
Binary Code (a) (Hexadecimal Equivalent)
Description
NLOC
1111-1111-0001-1110 (FF1E)
H2TU-C loopup from NI
CREM
0011-1111-0001-1110 (3F1E)
H2TU-C loopup from CI
NREM
1111-1111-0000-0010 (FF02)
H2TU-R loopup from NI
CLOC
0011-1111-0000-0010 (3F02)
H2TU-R loopup from CI
SMJK
11000-11000-11000 ...
H2TU-R loopup from NI
SMJK
100000 100000 100000 ...
H2TU-R loopup from N (b)
SMJK
1111-1111-0100-1000 (FF48)
H2TU-R loopup from NI (ESF-DL) (b)
Loopdown
11100-11100-11100 ...
H2TU-C and H2TU-R loopdown from NI OR CI
Loopdown
100-100-100 ...
H2TU-C and H2TU-R loopdown from NI OR CI
Loopdown
1111-1111-0010-0100 (FF24)
H2TU-C and H2TU-R loopdown from NI OR CI (ESF-DL)
(b)
(a) The leftmost bit arrives first in all sequences. The detection algorithm functions reliably with a random 10-3 Bit Error Ratio (BER)
on the facility. The entire arming and loopback sequence can also be initiated at the remote H2TU-R location.
(b) This loopback command is only valid when the SmartJack Loopback (LPBK) option is configured to ENABLED.
Loopback Testing Using a Maintenance Terminal
To activate a loopback session using a maintenance terminal:
1
Press
2
Press the SPACEBAR to select the NLOC, NREM, CLOC, or CREM loopback, then press
the loopback. Press Y to confirm.
3
To manually terminate the loopback, press the
confirm.
ESC
to clear the Config menu, then press
M
to select the Monitor screen.
SPACEBAR
to select LPDN, then press
ENTER
ENTER .
to activate
Press
Y
to
Loopback Testing Using Remote Unit Front-Panel Pushbuttons
On the H2TU-R front panel, press the appropriate pushbutton for 5 or more seconds:
•
LLB—Activates a dual loopback at the H2TU-R (NREM + CLOC).
•
RLB—Activates a dual loopback at the H2TU-C (NLOC + CREM).
To loopdown any active loopback in the system, including SMJK and TLOS, press the LLB or RLB
pushbutton for 5 or more seconds. To activate a dual loopback after a loopdown, again press the LLB or RLB
pushbutton for 5 or more seconds.
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Appendix A - Specifications
APPENDIX A - SPECIFICATIONS
Power
HDSL2 Span Voltage
0 or -180 ±5 Vdc
CO Supply
-48 Vdc nominal (-42.5 Vdc to -56.5 Vdc)
See “Power Consumption” and “Maximum Power Dissipation” and “Maximum
Current Drain” on page 52.
Electrical Protection
Secondary surge and power cross protection on HDSL2 ports. Requires external
primary protection.
Fusing
Internal; connected to “FUSE ALARM” output on pin25
Environmental
Operating Temperature
-40°F to +149°F (-40°C to +65°C)
Operating Humidity
5% to 95% (non-condensing)
Physical
Height
5.6 in. (14.22 cm)
Width
0.7 in. (1.7 cm)
Depth
5.6 in. (14.22 cm)
Weight
1 lb. 2 oz. (.51 kg)
Mounting
200 and 400 mechanics, high-density shelves
HDSL2
Line Rate
1.552 Mbps Overlapped Pulse Amplitude Modulation Transmission with Interlocking
Spectra (OPTIS)
Transmission
Full duplex
Media
One non-loaded, copper, two-wire cable pair
Output
+16.8 dBm ±0.5 dB at 135Ω (0-450 kHz) at CO side;
+16.5 dBm ±0.5 dB at 135Ω (0-350 kHz) at remote side
Line Impedance
135Ω
Maximum Insertion Loss
35 dB at 196 kHz
Maximum Loop Attenuation
28 dB
Start-up Time
30 sec. typical, 1 min. maximum per span
DSX-1
DSX-1 Line Impedance
100Ω
DSX-1 Pulse Output
6 Vpk-pk pre-equalized for 0-266 feet of ABAM cable
DSX-1 Input Level
+1.5 to -7.5 dB DSX
System
One-way DS1 Delay
<400 µs
Wander (Looped)
Meets MTIE T1.101 requirements
Wideband Jitter (Looped)
0.2 UI maximum
Narrowband Jitter (Looped)
0.1 UI maximum
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Appendix A - Specifications
LTPH-UM-1170-01
POWER CONSUMPTION
The three most important power parameters of an H2TU-C are its maximum power consumption, maximum
power dissipation, and maximum current drain.
Table 26 describes line-powered and locally powered circuits on 9 kft, 26 AWG loops.
Table 26.
H2TU-C Power Parameters
-48 Vdc Power
Consumption
(Watts)
Power Dissipation
(Watts)
-42.5 Vdc Current
(mA)
Maximum
Maximum
Maximum
Line-powered
12.0
7.0
286.0
Locally powered
8.6
6.7
205.0
Remote Power Source
MAXIMUM POWER DISSIPATION
The maximum power dissipation measures the power that is converted into heat and contributes to the total heat
generated in the space around the unit. It is used to determine the maximum number of fully loaded shelves per
bay that does not exceed the maximum allowable power dissipation density in watts per square foot to comply
with GR-63.
In COs, the maximum power dissipation for open-faced, natural convection-cooled mountings is limited to
134.7 watts per square foot per GR-63-CORE. Use this limit and the parameters in Table 26 to determine the
maximum number of H2TU-C circuits that can occupy one CO bay.
This is a worst case situation since it assumes the entire CO is subjected to the maximum power
density. More favorable conditions would permit increasing the number of shelves per bay
without jeopardizing the CO thermal integrity.
The thermal loading limitations imposed when using the H2TU-C in a Controlled Environmental Vault (CEV) or
other enclosures are determined by applying its power parameters to the manufacturer's requirements for each
specific housing.
The -48 Vdc Power Consumption is the maximum total power that the H2TU-C consumes or draws from the shelf
power source. This parameter is needed when the H2TU-C is in a location remote to the CO it is serving. It
determines the battery capacity required to maintain an 8-hour standby battery reserve for emergency situations.
Battery capacity, therefore, limits the maximum number of line units which can be installed in a remote enclosure.
Use the data in Table 26 above to perform this analysis.
MAXIMUM CURRENT DRAIN
The maximum current drain is the maximum current drawn from the shelf power supply when it is at its minimum
voltage (-42.5 Vdc). This determines the shelf fusing requirements. Use the -42.5 Vdc current data in Table 26
above to determine the shelf fusing requirements for your particular H2TU-C applications.
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Appendix A - Specifications
INSERTION LOSS AND LOOP ATTENUATION
Each loop has no more than 35 dB of insertion loss at 196 kHz, with driving and terminating impedances of 135Ω,
as shown in Table 27 below. This is equivalent to no more than 28 dB loop attenuation.
Table 27.
Cable Gauge
Insertion Loss (a) at
196 kHz (dB/kft)
HDSL2 Reach Chart
Loop Attenuation (dB/kft)
Maximum Reach (kft)
Ω per kft
26/0.4 mm
3.88
3.1
9
83
24/0.51 mm
2.84
2.2
12
52
22/0.61 mm
2.18
1.7
16
32
19/0.91 mm
1.54
1.2
23
16
(a) Insertion Loss = 1.25 times loop attenuation
H2TU-C CARD-EDGE CONNECTOR
56
54
52
50
48
Management bus 46
44
42
40
38
36
34
55
53
51
49
47 Ring 1
45
DSX-1 OUT
43
41 Tip 1
39
37
35 ( - )
33
31
29
27 Chassis ground*
-48Vdc Local power
25 Fuse alarm
23
21
19
(+)
17 Circuit ground
15 Ring
13 Ring
11
DSX-1 IN
HDSL2 Span
9
7 Tip
5 Tip
3
1
32
30
28
Alarm
26
24
22
Burn in /Factory use only 20
18
16
14
12
10
8
6
4
2
H0013-B
* Chassis ground may be connected to Earth ground per local practice.
** Active pins are solid black.
Figure 30.
H2TU-C Card-Edge Connector
Fuse Alarm
Pin 25 on the card-edge connector is a Fuse Alarm that is driven to -48 Vdc whenever its onboard fuse opens.
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Appendix A - Specifications
LTPH-UM-1170-01
Network Management Control Bus
The H2TU-C provides a Network Management Control Bus on pin 46 of the card-edge connector. This allows the
various ADC Management System protocols to manage the H2TU-C through the HMU-319 HiGain Management
Unit.
System Alarm Output Pin
Pins 22 and 30 on the card-edge connector, shown in Figure 30 on page 53, are the H2TU-C System Alarm output
pins. The following notes apply to pins 22 and 30.
•
Pins 22 and 30 replace the Local Loss of Signal (LLOS) on standard repeaters.
•
The H2TU-C forces pins 22 and 30 to +5 Vdc (maximum of 10 mA) for a system alarm condition. Pins 22
and 30 then remain at +5 Vdc for the duration of the alarm condition.
•
The H2TU-C Status LED flashes red for the duration of a system alarm condition.
•
Setting the ALM option to DIS only prevents the system alarm bus on pins 22 and 30 from being activated
for a system alarm event. The Status LED still flashes red and the ALRM message still displays.
•
“System Alarms” on page 43 describes the system alarms that activate pins that activate pins 22 and 30.
Pins 22 and 30 must never be taken above +5 Vdc or below -60 Vdc.
CRAFT PORT
Figure 31 shows the pinout for the craft port connector and its connection to a DB-9 or DB-25 connector on a
maintenance terminal.
Terminal
DB-9 Connector
(DTE)
2
H2TU-C
3
DB-9 Connector
(DCE)
5
2
TD (Transmit Data)
3
RD (Receive Data)
5
Terminal
GND
DB-25 Connector
(DTE)
H0017-A
3
2
7
Figure 31.
54
RS-232 Craft Port Pinouts
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Appendix B - Functional Operation
APPENDIX B - FUNCTIONAL OPERATION
ADC HDSL2 technology provides full-duplex services at standard DS1 rates over copper wires between an
H2TU-C and an H2TU-R, which comprise one HDSL2 system. ADC systems use ADC Overlapped Pulse
Amplitude Modulation Transmission with Interlocking Spectra (OPTIS) transceiver systems to establish a
full-duplex, 1.552 kbps data channel between an H2TU-C and a remotely located H2TU-R.
Figure 32 shows a block diagram of the H2TU-C. The H2TU-C receives a 1.544 Mbps DSX-1 data stream from
the DSX-1 digital cross-connect interface. The H2TU-C contains a DS1 frame synchronizer controlled by an 8-bit
microprocessor that determines the type of framing on the DS1 stream. The H2TU-C synchronizes to the type of
framing detected. The H2TU-C recognizes SuperFrame (SF), including D4 or Extended SuperFrame (ESF).
D
S
X
1
Tip 7
XMT (IN)
Ring 13
MON
LINE
A
Fuse alarm 25
-48Vdc 35
B
Power Supply
T1
Framer
HDSL 2
XCVR
HDSL2
Framer
Ground 17
A
B
Management bus
46
LINE
Pre-equalizer
Select
-180 +_ 5 Vdc
Power
Supply
(Ground isolated and
ground fault detection)
+
_
Microprocessor
Tip
MON
D
S
X
1
5
Tip 1
41
RCV (OUT)
47
Ring 1
LEDs
RS-232
HDSL 2
SPAN
15
H0022-B
22
Alarms
30
Figure 32.
Ring
H2TU-C Block Diagram
TIMING
The low loop wander (0.5 UI max) of an H2TU-C, when used with remote units, allows the circuit to be used in
all critical timing applications, including those that are used to transport Stratum 1 timing.
GROUND FAULT DETECTION
The H2TU-C has a Ground Fault Detection (GFD) circuit which detects a ground or a resistive path to ground on
any wire of the HDSL2 loop. This makes the product compliant with the Class A2 requirements of GR-1089.
H2TU-C-202 List 4G
November 8, 2002
55
Appendix C - Compatibility
LTPH-UM-1170-01
APPENDIX C - COMPATIBILITY
The HiGain system uses HDSL2 transmission technology as recommended by ANSI committee in compliance
with the ANSI T1.418-2000 HDSL2 standards. HiGain HDSL2 complies with GR-63-CORE, TR-TSY-000499,
and GR-1089-CORE.
The H2TU-C is compatible with any 200 mechanics shelf, including the following ADC HiGain shelves:
56
•
HRE-425 (12-slot)
•
HRE 422 (2-slot)
•
HRE- 204 (4-slot)
•
HRE-206 (6-slot)
•
HRE-420 (1-slot)
•
HUS-340 (3-slot shelf)
November 8, 2002
H2TU-C-202 List 4G
LTPH-UM-1170-01
Appendix D - Product Support
APPENDIX D - PRODUCT SUPPORT
ADC Customer Service Group provides expert pre-sales and post-sales support and training for all its products.
Technical support is available 24 hours a day, 7 days a week by contacting the ADC Technical Assistance Center.
Sales Assistance
800.366.3891 extension 73000
(USA and Canada)
952.917.3000
Fax: 952.917.3237
• Quotation Proposals
Systems Integration
800.366.3891, extension 73000 (USA and Canada)
952.917.3000
• Complete Solutions (from concept to
installation)
• Ordering and Delivery
• General Product Information
• Network Design and Integration Testing
• System Turn-Up and Testing
• Network Monitoring (upstream or downstream)
• Power Monitoring and Remote Surveillance
• Service/Maintenance Agreements
• Systems Operation
ADC Technical Assistance Center
800.638.0031
714.730.3222
Fax: 714.730.2400
Email: [email protected]
• Technical Information
• System/Network Configuration
• Product Specification and Application
• Training (product-specific)
• Installation and Operation Assistance
• Troubleshooting and Repair/Field Assistance
Online Technical Support
• www.adc.com/technical support
Online Technical Publications
• www.adc.com/documentation library/ technical
publications
Product Return Department
800.366.3891 ext. 73748 or
952.917.3748
Fax: 952.917.3237
Email: repair&[email protected]
• ADC Return Material Authorization (RMA)
number and instructions must be obtained
before returning products.
All telephone numbers with an 800 prefix are toll-free in the USA and Canada.
H2TU-C-202 List 4G
November 8, 2002
57
Appendix E - Abbreviations
LTPH-UM-1170-01
APPENDIX E - ABBREVIATIONS
A
F
ACON:
Auto Conversion of DS1 Frame
FCON:
Frame Conversion
AIS:
Alarm Indication Signal
FDL:
Facility Data Link
AIS-CI:
Alarm Indication Signal-Customer Installation
FE:
Far End
AOR:
Addressable Office Repeater
FT1:
Fractional T1
AUTO:
Auto-Framing Mode
AWG:
American Wire Gauge
G
B
GFD:
Ground Fault Detection
GNLB:
Generic Loopback
BER:
Bit Error Rate
BPV:
Bipolar Violation
H
BPVT:
Bipolar Violation Transparency
H2TU-R:
HiGain HDSL2 Remote Unit
HCDS:
High Capacity Digital Service
C
CLEI:
Common Language Equipment Identifier
I
CLOC:
Customer Local Loopback
INSL:
CO:
Central Office
CONV:
Conversion
L
CREM:
Customer Remote Loopback
LA:
Loop Attenuation
CV:
Code Violation
LED:
Light Emitting Diode
CV-L:
Code Violation - Line
LOF:
Loss of Frame
CV-P:
Code Violation - Path
LOS:
Loss of Signal
LOSW:
Loss of Sync Word
LPF:
Line Power Feed
D
Insertion Loss
DBER:
DS1 BER
DDS:
Digital Data Service
M
DIS:
Disabled
MSEC:
DL:
Data Link
DLC:
Digital Loop Carrier
N
DS0:
Digital Signal, Level 0
NE:
Near End
NI:
Network Interface
NID:
Network Interface Device
E
Monitored Seconds
ECI:
Equipment Catalog Item
NIU:
Network Interface Unit
ENA:
Enabled
NLOC:
Network Local Loopback
ESD:
Electrostatic Discharge
NMA:
Network Management and Administration
ESF:
Extended SuperFrame
NPRM:
Network Performance Report Messaging
ES-L:
Errored Seconds - Line
NREM:
Network Remote Loopback
EXZ:
The occurrence of 8 consecutive zeroes for B8ZS or
NVRAM:
Non-Volatile Random Access Memory
16 for AMI.
58
November 8, 2002
H2TU-C-202 List 4G
LTPH-UM-1170-01
Appendix E - Abbreviations
O
OOF:
Out-of-Frame
OPTIS:
Overlapped PAM Transmission with Interlocking
Spectra
P
PBOC:
Power Back Off - Customer
PBON:
Power Back Off - Network
PDVS:
Pulse Density Violation Seconds
PL:
Payload Loopback Command
PRM:
Performance Report Messaging
PRM-FE: Performance Report Messaging - Far End
PRM-NE: Performance Report Messaging - Near End
S
SES:
Severely Errored Seconds
SES-L:
Severely Errored Seconds - Line
SES-P:
Severely Errored Seconds - Path
SF:
SuperFrame
SMJK:
SmartJack
SPRM:
Supplemental Performance Report Messaging
T
TLOS:
Transmit Loss of Signal
U
UAS-L:
Unavailable Seconds - Line
UAS-P:
Unavailable Seconds - Path
H2TU-C-202 List 4G
November 8, 2002
59
Appendix E - Abbreviations
60
LTPH-UM-1170-01
November 8, 2002
H2TU-C-202 List 4G
CERTIFICATION AND WARRANTY
FCC CLASS A COMPLIANCE
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at his own expense.
LIMITED WARRANTY
Product warranty is determined by your service agreement. Contact your sales representative or Customer Service for details.
MODIFICATIONS
Any changes or modifications made to this device that are not expressly approved by ADC DSL Systems, Inc. voids the user's warranty.
All wiring external to the products should follow the provisions of the current edition of the National Electrical Code.
SAFETY STANDARDS COMPLIANCE
The equipment has been tested and verified to comply with the applicable sections of the following standards:
•
GR 63-CORE - Network Equipment-Building System (NEBS) Requirements
•
GR 1089-CORE - Electromagnetic Compatibility and Electrical Safety
•
Binational standard, UL-1950/CSA C22.2 No. 950-95: Safety of Information Technology Equipment
For technical assistance, refer to “Appendix D - Product Support” on page 57.
ADC DSL Systems, Inc.
14402 Franklin Avenue
Tustin, CA 92780-7013
Tel: 714.832.9922
Fax: 714.832.9924
Technical Assistance
Tel: 800.638.0031
Tel: 714.730.3222
Fax: 714.730.2400
DOCUMENT: LTPH-UM-1170-01
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1237647
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