Black Box G.703/G.704 NTU w/10BaseT User Manual

®
®
BLACK BOX
NETWORK SERVICES
MARCH 2006
MT334A
G.703/G.704
NTU w/10BaseT
G.703/G.704 NTU
w/10BaseT
Test Modes
Link
tus LOS
E1 10BT Sta
ER
TM
Local
Normal
Remote
511/E
Normal
511
CUSTOMER Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
SUPPORT FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
INFORMATION Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
G.703/G.704 NTU W/10BASET
CE NOTICE
The CE symbol on your Black Box equipment indicates that it is in compliance
with the Electromagnetic Compatibility (EMC) directive and the Low Voltage
Directive (LVD) of the European Union (EU). A Certificate of Compliance is
available by contacting Technical Support.
RADIO AND TV INTERFERENCE
The Multi-Rate Ethernet Extender generates and uses radio frequency energy,
and if not installed and used properly-that is, in strict accordance with the manufacturer’s instructions-may cause interference to radio and television reception.
The Multi-Rate Ethernet Extender has been tested and found to comply with the
limits for a Class A computing device in accordance with specifications in Subpart B of Part 15 of FCC rules, which are designed to provide reasonable protection from such interference in a commercial installation. However, there is no
guarantee that interference will not occur in a particular installation. If the Ethernet Extender does cause interference to radio or television reception, which can
be determined by disconnecting the unit, the user is encouraged to try to correct
the interference by one or more of the following measures: moving the computing equipment away from the receiver, re-orienting the receiving antenna and/or
plugging the receiving equipment into a different AC outlet (such that the computing equipment and receiver are on different branches).
2
G.703/G.704 NTU W/10BASET
FCC PART 68
The MT334A is not intended to be connected to the public telephone network.
Caution
TRADEMARKS USED IN THIS MANUAL
All applied-for and registered trademarks are the property of their respective owners.
NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY STATEMENT
Instrucciones De Seguridad
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes
de que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca
de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc.
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales
que sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea
recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más
allá a lo descrito en las instrucciones de operación. Todo otro servicio
deberá ser referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá, alfombra
o superficie similar puede bloquea la ventilación, no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor
como radiadores, registros de calor, estufas u otros aparatos (incluyendo
amplificadores) que producen calor.
3
G.703/G.704 NTU W/10BASET
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo
descrito en el instructivo de operación, o como se indique en el aparato.
12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización
del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean
pisados ni pellizcados por objetos colocados sobre o contra ellos, poniendo
particular atención a los contactos y receptáculos donde salen del aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas
de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no sea
usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A. El cable de poder o el contacto ha sido dañado; u
B. Objectos han caído o líquido ha sido derramado dentro del aparato; o
C. El aparato ha sido expuesto a la lluvia; o
D. El aparato parece no operar normalmente o muestra un cambio en su
desempeño; o
E. El aparato ha sido tirado o su cubierta ha sido dañada.
4
G.703/G.704 NTU W/10BASET
CONTENTS
CE Notice .................................................................................................... 2
Radio and TV Interference .......................................................................... 2
FCC Part 68 ................................................................................................. 3
Trademarks Used In This Manual ............................................................... 3
Normas Oficiales Mexicanas (NOM) Electrical Safety Statement ............. 3
1.
General information .....................................................................................7
1.1 Features............................................................................................... 7
1.2 Description ......................................................................................... 7
2.
PPP Operational Background ...................................................................... 9
2.3 Applications........................................................................................ 9
3.
Configuration............................................................................................. 12
3.4 DIP Switch Configuration ................................................................ 12
3.4.1 Switch SW1-1 through SW1-5 .............................................. 13
3.4.2 SW1-6 and SW1-7 Clock Modes .......................................... 14
3.4.3 Switch SW2-1 Line Coding: HDB3 (DEFAULT) ................ 15
3.4.4 Switch SW2-2: CRC-4 Multiframe ....................................... 16
3.4.5 Switch SW2-3 Data Inversion ............................................... 16
3.4.6 Switch SW2-4: Remote Digital Loopback Type ................... 16
3.4.7 Switch SW2-5 Front Panel Switches..................................... 17
3.4.8 Switch SW2-6: V.54 Response Disabled (DEFAULT) ........ 17
4.
Installation ................................................................................................. 18
4.5 Connecting to the G.703 network..................................................... 18
4.5.9 Connecting dual coaxial cable (75 ohm) to the
G.703 network ....................................................................... 18
4.5.10 Opening the case................................................................... 19
4.5.11 Connecting the twisted pair (120 ohm) to the
G.703 network ....................................................................... 19
4.6 Connecting the 10Base-T Ethernet port to a PC (DTE) ................... 20
4.7 Connecting the 10Base-T Ethernet port to a hub ............................. 20
4.8 Power connection ............................................................................. 21
5.
Operation ................................................................................................... 22
5.9 Power-up........................................................................................... 22
5.10 LED status monitors ......................................................................... 22
5.11 Loop (V.54 & Telco) diagnostics..................................................... 24
5
G.703/G.704 NTU W/10BASET
5.11.12
5.11.13
5.11.14
5.11.15
Operating Local Loopback (LL) ........................................ 24
Operating Remote Digital Loopback (RL)......................... 24
CSU Loop........................................................................... 25
Using the V.52 (BER) Test Pattern Generator ................... 26
A.
G.703/G.704 specifications ....................................................................... 27
B.
Ethernet 10Base-T specifications .............................................................. 29
6
G.703/G.704 NTU W/10BASET
1. General information
Thank you for your purchase of this Black Box product. If any questions arise
during installation or use of the unit, contact Black Box Tech Support at
(724) 746-5500.
1.12 Features
• Terminates G.703 and G.704, clear channel/structured E1 service
• n x 64 kbps data rates to 2.048 Mbps
• 10Base-T Ethernet bridge
• PPP (Point to Point Protocol, RFC 1661) with Bridge Control Protocol (RFC
1638)
• 75-ohm dual coax and 120-ohm twisted-pair G.703 connections
• Local and remote loopback diagnostics
• Internal and G.703 network timing
• CE approval
• 90–260VAC
• Conforms to ONP requirements CTR 12 and CTR 13 for connection to interna-
tional Telecom networks
1.13 Description
The MT334A receives channelized G.704 (n x 64 kbps) or clear channel
E1/G.703 (2.048-Mbps) data from the telco’s digital data network. The MT334A
terminates the G.703 telco interface and converts the data for transmission to a
user-oriented 10Base-T (802.3) Ethernet interface.
The MT334A supports an integrated 10Base-T (802.3) Ethernet port with transparent bridging capability for IP, IPX, DECnet, NetBIOS and other layer-3 protocols. The MT334A attaches to the LAN and intelligently bridges data traffic to
the large central site router through the telco’s leased line network. The MT334A
supports PPP (RFC 1661) and BCP (RFC 1638).
The MT334A is a 10Base-T bridge that operates over G.703/G.704 lines. It uses
MAC learning and forwarding to provide seamless LAN-to-LAN connectivity.
7
G.703/G.704 NTU W/10BASET
As a result, corporate enterprises can connect their servers to a pair of NTUs and
automatically forward data packets that are meant for the remote network. Local
packets are filtered and passed only to the local LAN.
8
G.703/G.704 NTU W/10BASET
2. PPP Operational Background
PPP is a protocol used for multiplexed transport over a point-to-point link. PPP
operates on all full duplex media, and is a symmetric peer-to-peer protocol,
which can be broken into three main components: 1. A standard method to encapsulate datagrams over serial links; 2. A Link Control Protocol (LCP) to establish,
configure, and test the data-link connection; 3. A family of Network Control Protocols (NCPs) to establish and configure different network layer protocols.
In order to establish communications over a point-to-point link, each end of the
PPP link must first announce its capabilities and agree on the parameters of the
link’s operation. This exchange is facilitated through LCP ConfigureRequest packets.
Once the link has been established and optional facilities have been negotiated,
PPP will attempt to establish a network protocol. PPP will use Network Control
Protocol (NCP) to choose and configure one or more network layer protocols.
Once each of the network layer protocols have been configured, datagrams from
the established network layer protocol can be sent over the link. The link will
remain configured for these communications until explicit LCP or NCP packets
close the link down, or until some external event occurs.
The PPP Bridging Control Protocol (BCP), defined in RFC 1638, configures and
enables/disables the bridge protocol on both ends of the point-to-point link. BCP
uses the same packet exchange mechanism as the Link Control Protocol (LCP).
BCP is a Network Control Protocol of PPP, bridge packets may not be exchanged
until PPP has reached the network layer protocol phase.
2.14 Applications
In situations where a routed network requires connectivity to a remote Ethernet
network, the interface on a router can be configured as a PPP IP Half Bridge. The
serial line to the remote bridge functions as a Virtual Ethernet interface, effectively extending the routers serial port connection to the remote network. The
bridge device sends bridge packets (BPDUs) to the router’s serial interface. The
router will receive the layer three address information and will forward these
packets based on its IP address.
9
G.703/G.704 NTU W/10BASET
Figure 1 shows a typical router with a serial interface configured as a PPP Half
Bridge. The router serial interface uses a remote device that supports PPP bridging to function as a node on the remote Ethernet network. The serial interface on
the router will have an IP address on the same Ethernet subnet as the bridge.
MT334A
Bridge
de
Ma
RX
in the
US
A
E1
Router
Internet
TX
Ethernet
LAN
Customer’s Site
Lin
Ethe
Po
we
e
rnet
r
Service Provider’s Network
PEC Device with serial interface
Figure 1. Router with serial interface, configured as PPP Half Bridge.
For example, the customer site is assigned the addresses 192.168.1.0/24 through
192.168.1.1/24. The address 192.168.1.1/24 is also the default gateway for the
remote network. The above settings remove any routing/forwarding intelligence
from the CPE. The associated router configuration will set serial interface (s0) to
accommodate half bridging for the above example.
Authentication is optional under PPP. In a point-to-point leased-line link, incoming customer facilities are usually fixed in nature, therefore authentication is generally not required. If the foreign device requires authentication via PAP or
CHAP, the PPP software will respond with default Peer-ID consisting of the units
Ethernet MAC address and a password which consists of the unit’s Ethernet
MAC address.
Some networking systems do not define network numbers in packets sent out
over a network. If a packet does not have a specific destination network number, a
router will assume that the packet is set up for the local segment and will not forward it to any other sub-network. However, in cases where two devices need to
communicate over the wide-area, bridging can be used to transport nonroutable protocols.
10
G.703/G.704 NTU W/10BASET
Figure 2 illustrates transparent bridging between two routers over a serial interface (s0). Bridging will occur between the two Ethernet Interfaces on Router A
(e0 and e1) and the two Ethernet Interfaces on Router B (e0 and e1).
!
no ip routing
!
interface Ethernet0
ip address 1.1.1.1 255.255.255.0
bridge-group 1
!
interface Serial0
ip address 1.1.1.1 255.255.255.0
encapsulation PPP
bridge-group 1
!
interface Serial1
ip address 2.2.2.2 255.255.255.0
bridge-group 1
!
bridge 1 protocol ieee
!
MT334A
Serial Interface
E1/FE1 Link
Router A
S0
e0
S1
Router B
Using Bridge-Groups, multiple remote LANs can be
bridged over the wide-area.
LAN
LAN
S1
S0
e0
LAN
e1
LAN
LAN
MT334A
Serial Interface
E1/FE1 Link
Figure 2. Transparent bridging between two routers over a serial interface
11
G.703/G.704 NTU W/10BASET
3. Configuration
The MT334A features configuration capability via hardware DIP switches. This
section describes all possible DIP switch configurations of the MT334A.
3.15 DIP Switch Configuration
The MT334A has two sets of internal DIP switches that allow configuration for a
wide range of applications. The sets of switches are accessed from the underside.
Figure 3 shows the location of the DIP switches on the bottom of the printed circuit board.
Rear
OFF
8 7 6 5 4 3 2 1
ON
8 7 6 5 4 3 2 1
S1
S2
Front
Figure 3. Underside of MT334A, Showing Location of DIP Switches
The MT334A DIP switches (Switch Sets 1–2) can be configured as either “ON”
or “OFF”. Figure 4 shows the orientation of the DIP switches with respect to
ON/OFF positions.
Figure 4. Close up of configuration switches
12
G.703/G.704 NTU W/10BASET
3.15.16 SWITCH SW1-1 THROUGH SW1-5
A detailed description of each switch (SW1-1 through SW1-5) setting follows the
summary table below.
SWITCH SET 1 SUMMARY TABLE
Position
Function
Factory Default
SW1-1
DTE Rate
Off
SW1-2
DTE Rate
Off
SW1-3
DTE Rate
Off
Selected Option
}
2.048 Mbps
Clear
Channel
SW1-4
DTE Rate
Off
SW1-5
DTE Rate
Off
SW1-6
Clock Mode
Off
Receive Recovered
SW1-7
Clock Mode
Off
Receive Recovered
SW1-8
Not Used
N/A
N/A
Use Switches SW1-5 to set the DTE data rate.
SW1
SW2
SW3
SW4
SW5
Speed
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
On
Off
Off
On
On
Off
Off
On
On
Off
Off
On
On
Off
Off
On
On
On
On
On
On
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
On
On
On
On
On
On
On
On
On
On
Off
Off
Off
Off
Off
Off
Off
Off
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Off
Off
64 kbps
128 kbps
192 kbps
256 kbps
320 kbps
384 kbps
448 kbps
512 kbps
576 kbps
640 kbps
704 kbps
768 kbps
832 kbps
896 kbps
960 kbps
1024 kbps
1088 kbps
1152 kbps
13
G.703/G.704 NTU W/10BASET
SW1
SW2
SW3
SW4
SW5
Speed
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
Off
Off
On
On
Off
Off
On
On
Off
Off
On
On
Off
Off
On
On
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
On
On
On
On
On
On
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
1216 kbps
1280 kbps
1344 kbps
1408 kbps
1472 kbps
1536 kbps
1600 kbps
1664 kbps
1728 kbps
1792 kbps
1856 kbps
1920 kbps
1984 kbps
Clear Channel 2048 kbps
Note
When the data rate is set to 2.048Mb/s, then the unit is forced into G.703
mode, and it transmits user data on all 32 time-slots. There is no framing
information; therefore, the CRC4 MF (SW2-2) switch is ignored. In all
other rate settings, the unit employs G.704 framing; TS0 is reserved
for signaling.
SW16
SW1-7
Clock Mode
On
On
Off
Off
On
Off
On
Off
Network (Receive Recovered)
Internal
Internal
Network (Receive Recovered)
3.15.17 SW1-6 AND SW1-7 CLOCK MODES
Network Clock: Transmitter timing is derived using the receive line signal
(receive recovered) from the network.
Internal Clock: Transmitter timing is derived from an internal clock source.
14
G.703/G.704 NTU W/10BASET
Switch SET 2 SUMMARY Table
Position
SW2-1
SW2-2
SW2-3
SW2-4
SW2-5
SW2-6
SW2-7
SW2-8
Function
Factory Default
Selected Option
Line Coding
CRC-4 multiframe
Data Inversion
V.54/CSU select
FPS enabled
V.54 Response
Not Used
Not Used
Off
Off
Off
Off
Off
ON
Off
Off
HDB3
Disabled
Data Not Inverted
V.54 RDL loop
Enabled
Disabled
N/A
N/A
3.15.18 SWITCH SW2-1 LINE CODING: HDB3 (DEFAULT)
Use Switch SW2-1 to control the Network Line Coding options. Set these
options to be the same as the Line Coding given to you by your Service Provider.
If you are using two MT334As together as short range modems, set both units
to HDB3.
SW2-1
Line Encoding
Off
On
HDB3
AMI
Options: HDB3, AMI
HDB3: In this line coding, the transmitter substitutes a deliberate bipolar violation when excessive zeros in the data stream are detected. The receiver recognizes these special violations and decodes them as zeros. This method enables the
network to meet minimum pulse density requirements. Unless AMI is required in
your application, HDB3 should be used whenever possible.
AMI: Alternate Mark Inversion defines a pulse as a “mark,” a binary one, as
opposed to a zero. In an E1 network connection, signals are transmitted as a
sequence of ones and zeros. Ones are sent as pulses, and zeros are sent as spaces,
i.e., no pulse. Every other pulse is inverted from the previous pulse in polarity, so
that the signal can be effectively transmitted. This means, however, that a long
sequence of zeros in the data stream will cause problems, since the NTU receiving the signal relies on the signal to recover the 2.048 Mb/s clock.
15
G.703/G.704 NTU W/10BASET
If you must use AMI, you should ensure that the data terminal equipment connected to the unit provides a minimally acceptable pulse density. For this reason,
there are advantages to using HDB3 instead. AMI coding does not inherently
account for ones density. To meet this requirement, the user should ensure that
the data inherently meets pulse density requirements.
3.15.19 SWITCH SW2-2: CRC-4 MULTIFRAME
In framed mode, SW2-2 is used for CRC-4 MF. When CRC-4 is enabled, the unit
monitors the incoming data stream for CRC-4 errors. It transmits CRC-4 error
counts to the transmitting unit. When using timeslot zero (TS0), excessive errors
may cause loss of frame or loss of sync. If CRC-4 MF is used, both units must be
set for set for CRC-4 MF. Otherwise, the one using CRC-4 MF will detect loss
of sync.
Note
SW2-2
Option
Off
On
CRC-4 Disabled
CRC-4 Enabled
When the data rate is set to 2.048Mb/s, then the unit is forced into G.703
mode, and it transmits user data on all 32 time-lots. There is no framing
information; therefore, the CRC4 MF (SW2-2) switch is ignored. In all
other rate settings, the unit employs G.704 framing; TS0 is reserved
for signaling.
3.15.20 SWITCH SW2-3 DATA INVERSION
Set Switch S2-3 to determine whether or not the data stream from the local DTE
is inverted within the MT334A before being passed to the G.703/G.704 network.
An inverted data stream may be required when you use the MT334A to communicate with a G.703 device (that inverts the data) on the remote end. In typical
installations, data inversion is not necessary.
SW2-3
Option
Off
On
Data not inverted
Data inverted
3.15.21 SWITCH SW2-4: REMOTE DIGITAL LOOPBACK TYPE
The user can set this variable to select the type of remote loop that will be initiated by the MT334A. If set to V.54, the MT334A will initiate a V.54 loop when
Remote Loop is selected by the front panel switches. If set to CSU, the MT334A
16
G.703/G.704 NTU W/10BASET
will initiate a CSU loop when Remote Loop is selected by the front
panel switches.
S2-4
RDL Type
Off
On
Initiate a V.54 RDL loop when selected
Initiate a CSU loopback when selected
3.15.22 SWITCH SW2-5 FRONT PANEL SWITCHES
As the Front Panel Switches may be inadvertently toggled, or in the event that the
end-user may not need to use the switches, the installer may disable the front
panel switches. Set Switch S2-5 to determine whether the front-panel toggle
switches are active or inactive.
SW2-5
Option
Off
On
Front Panel Switches Enabled
Front Panel Switches Disabled
3.15.23 SWITCH SW2-6: V.54 RESPONSE DISABLED (DEFAULT)
V.54 is a special in-band loopback facility that sends a pseudo-random pattern
over the data stream. This is the only loopback that the unit can initiate. This is
useful for campus applications when you need to put a remote unit in loopback.
The unit responds to the V.54 loopback command, and the whole process takes
only a few seconds to complete. When V.54 Loopback is disabled, the unit will
not be able to respond to V.54 loopback commands.
SW2-6
Option
Off
On
V.54 Response Enabled
V.54 Response Disabled
17
G.703/G.704 NTU W/10BASET
4. Installation
Once the MT334A is properly configured, it is ready to connect to the
G.703/G.704 interface, to the Ethernet port, and to the power source. This section
describes how to make these connections.
4.16 Connecting to the G.703 network
The Power, G.703/G.704 and Ethernet Line connections are located on the rear
panel of the MT334A. Figure 5 shows the location of each of these ports.
A
in
de
the
US
Ma
RX
TX
e
Lin
et
ern
Eth
RX (75 Ohm)
(Data from
Line (120 Ohm) network)
r
we
Po
Ethernet
Power
TX (75 Ohm)
(Data to
network)
Figure 5. MT334A Rear Panel
4.16.24 CONNECTING DUAL COAXIAL CABLE (75 OHM) TO THE
G.703 NETWORK
The MT334A is equipped with dual female BNCs (TX and RX) for connection to
a 75 ohm dual coax G.703 network interface. If your G.703/G.704 network terminates via dual coaxial cable, use the diagram below to make the proper connections. See figure 5 on page 18.
18
G.703/G.704 NTU W/10BASET
Note
The outer conductor of the coax cables are isolated from system
earth ground.
When using the 75 Ohm interface, jumper straps JP2, JP5, JP6, and JP7 must be
installed over the jumpers. The jumpers are located next to the BNC connectors.
Refer to the following section to open the case. Open the case and install jumper
straps for JP2, JP5, JP6, and JP7.
4.16.25 OPENING THE CASE
Open the case by inserting a screwdriver into the slots and twist the screwdriver
head slightly. The top half of the case will separate from the lower half of the
case. Take caution not to damage any of the PC board mounted components.
4.16.26 CONNECTING THE TWISTED PAIR (120 OHM) TO THE G.703 NETWORK
The MT334A is equipped with a single RJ-48C jack for connections to a 120
ohm twisted pair G.703/G.704 network interface. If your G.703/G.704 network
terminates via RJ-48C, use the connection diagram (see Figure 6) following the
pinout and signals chart below to connect the 120 ohm G.703/G.704
network channel.
RJ-45 Cable (8-Wire)
G.703/G.704
Network signal
RX+
RX-
PIN#
1
2
MT334A signal
TX+
TX-
TX+
TX-
5
4
RX+
RX-
Shield
Shield
3
6
Shield
Shield
(No Connection) 8
(No Connection) 7
(No Connection) 6
(TX+) 5
(TX-) 4
(No Connection) 3
(RX-) 2
(RX+) 1
8
7
6
5
4
3
2
1
Figure 6. G.703/G.704 170 Ohm Connection.
19
G.703/G.704 NTU W/10BASET
1
2
3
4
5
6
7
8
1 TD+ (data output from MT334A)
2 TD- (data output from MT334A)
3 RD+ (data input to MT334A)
4 (no connection)
5 (no connection)
6 RD- (data input to MT334A)
7 (no connection)
8 (no connection)
Figure 7. Connecting the 10Base-T Ethernet Port to a PC
4.17 Connecting the 10Base-T Ethernet port to a PC (DTE)
The 10Base-T interface is configured as DTE (Data Terminal Equipment). If the
MT334A is to connect to another DTE device such as a 10Base-T network interface card, construct a 10Base-T crossover cable and connect the wires as shown
in Figure 8.
\
10BaseT Port
RJ-45 Pin No.
1 (TD+)
2 (TD-)
3 (RD+)
6 (RD-)
10Base-T DTE
RJ-45 Pin No.
1 (TD+)
2 (TD-)
3 (RD+)
6 (RD-)
Figure 8. 10Base-T cross-over cable connection
4.18 Connecting the 10Base-T Ethernet port to a hub
The 10Base-T interface is configured as DTE (Data Terminal Equipment), just
like a 10Base-T network interface card in a PC. Therefore, it “expects” to connect
to a 10Base-T Hub using a straight-through RJ-45 cable. Use Figure 9 to construct a cable to connect the 10Base-T interface to a 10Base-T Hub.
10BaseT Port
RJ-45 Pin No.
1 (TD+)
2 (TD-)
10Base-T Hub
RJ-45 Pin No.
1 (RD+)
2 (RD-)
3 (RD+)
6 (RD-)
3 (TD+)
6 (TD-)
Figure 9. Connecting the 10Base-T Ethernet Port to a Hub
20
G.703/G.704 NTU W/10BASET
4.19 Power connection
The MT334A uses a 5VDC, 2A universal input 100–240 VAC, power supply
(center pin is +5V). The universal input power supply has a male IEC-320 power
entry connector. This power supply connects to the MT334A by means of a barrel
jack on the rear panel. Many international power cords are available for the universal power supply.
Note
The MT334A powers up as soon as it is plugged into an AC outlet—
there is no power switch.
There are no user-serviceable parts in the
power supply section of the MT334A.
Contact Black Box technical support at
+1 (724) 746-5500 for more information.
WARNING
21
G.703/G.704 NTU W/10BASET
5. Operation
When the MT334A has been properly configured and installed, it should operate
transparently. This sections describes power-up, LED status monitors, and the
built-in loopback test modes.
5.20 Power-up
Before applying power to the MT334A, refer to section “Power connection” on
page 21 and ensure that the unit is properly connected to the appropriate
power source.
5.21 LED status monitors
The MT334A features six front panel LEDs that monitor connections on the
G.703/G.704 and 10BaseT links, signaling, error and test modes. Figure 10
shows the front panel location of each LED. Descriptions of each LED
follow Figure 10.
TU
T
se
Ba
10
w/
4N
70
.
3/G
70
G.
TM
ER
LOS
Status
10BT
E1 Link
Figure 10. MT334A front panel
22
Test Mode
switches
G.703/G.704 NTU W/10BASET
E1 Link: (Active Green) Solid green (On) indicates that the end to end E1 Link
is up, signifying that the link is active. The E1 Link LED is Off when the link
is down.
10BT Link: (Active Green) Solid green indicates that the 10Base-T Ethernet
interface has detected a valid SQE heartbeat, signifying a valid
10Base-T connection.
Status: Blinks yellow from one to eleven times to indicate system status. Each
pulse pattern is separated by a 2 second “off” period. Greater pulse patterns have
higher priority (buffer saturation has greater priority than an empty MAC table).
Valid system statuses are:
1 pulse
2 pulses
3 pulses
=
=
=
4 pulses
5 pulses
6 pulses
7 pulses
8 pulses
9 pulses
10 pulses
11 pulses
=
=
=
=
=
=
=
=
System status is okay
no MAC entries in the MAC Address Table
Clear to Send (CTS) or Carrier Detect (DCD) from
base unit are not asserted
IM1/I buffer is saturated
WAN receive frame(s) too large
WAN receive frame(s) not octet aligned
WAN receive frame(s) aborted
Detected WAN receive frame(s) with CRC
Detected LAN receive frame(s) too large
Detected LAN receive frame(s) not octet aligned
Detected LAN receive frame(s) with bad CRC
LOS: The Loss of Sync LED lights when the unit loses synchronization with the
incoming signal. This may happen when there is a framing mismatch or a loss of
signal. In unframed mode, the LOS LED monitors the status of the
transmit clock.
ER: The error LED indicates various error conditions, including framing bit
errors, excessive zeros, controlled slips, severe errors, or bit errors (when sending
V.52 test patterns). When sending a test pattern, the LED will remain lit if the unit
does not receive the identical pattern. When it receives the correct pattern, the
LED will turn off. If error insertion is on, the LED will blink once a second if
everything is operating properly.
TM: (Active Yellow) Solid Yellow indicates an Active Test Mode. The unit may
be placed in test mode by the local user or by the remote user.
23
G.703/G.704 NTU W/10BASET
5.22 Loop (V.54 & Telco) diagnostics
The MT334A offers three V.54 loop diagnostics. Use these diagnostics to test the
NTU and any communication links. These tests can be activated via the front
panel switches.
5.22.27 OPERATING LOCAL LOOPBACK (LL)
The Local Loopback (LL) test checks the operation of the local MT334A, and is
performed separately on each unit.
2Mbps G.703
Network
2Mbps G.703
Network
G.703/G.704 NTU
MT334A
Receive
Recover
Clocking
All Switches Internal
set to “OFF” Clocking
Cable Span
Clock/
Data
Ethernet
Device
Data
Clock/
Data
MT334A
MT334A
Figure 11. Local Loopback for a Network Termination Application
To perform a LL test, do the following:
1. Activate LL. This may be done by selecting local loop on the front panel
switch.
2. Perform a V.52 BER (bit error rate) test as described in section “Using the
V.52 (BER) Test Pattern Generator” on page 26. If the BER test equipment
indicates no faults, but the data terminal indicates a fault, follow the manufacturer’s checkout procedures for the data terminal. Also, check the interface cable between the terminal and the MT334A.
5.22.28 OPERATING REMOTE DIGITAL LOOPBACK (RL)
The Remote Digital Loopback (RL) test checks the performance of both the local
and remote MT334A, as well as the communication link between them. Any
characters sent to the remote MT334A in this test mode will be returned back to
the originating device.
24
G.703/G.704 NTU W/10BASET
G.703/G.704 NTU
MT334A
G.703/G.704 NTU
Network
Internal
Clocking
Ethernet
Device
Clock/
Data
Cable
Span
Receive
Recover
Clocking
Clock/
Data
Data
Clock/
Data
Ethernet
Device
Data
MT334A
MT334A
Figure 12. Remote Loop in a Network Extension Application
There are two Remote Loops that can be initiated from the MT334A MT334A
unit: (1) V.54 Loop, and; (2) CSU Loop. The user can select the type of loop that
can be initiated by Switch S2-4. When a loopback is initiated this is the type of
loop that the unit uses to loop up the remote unit and which type of loop the unit
will respond to.
To perform an RDL test, follow these steps:
1. Activate RDL. This may be done by setting the front panel switch
to ‘Remote’.
2. Perform a bit error rate test (BERT) using the internal V.52 generator (as
described in section “Using the V.52 (BER) Test Pattern Generator” on
page 26), or using a separate BER Tester. If the BER test indicates a fault,
and the Local Line Loopback test was successful for both MT334As, you
may have a problem with the twisted pair line connection.
5.22.29 CSU LOOP
Although CSU Loop is predominantly a T1 function, the MT334A-MT334A
responds to central office initiated loop commands. Customers can use this facility when the Central Office network switch supports CSU loops over an
E1 interface.
When CSU Loop is selected, and when in D4 framing mode, the MT334A
MT334A will implement the “loop up” command when it recognizes the pattern
“10000” in the data stream for a minimum of 5 seconds. The “loop down” command is implemented by the pattern “100” in the data stream for a minimum of
5 seconds.
25
G.703/G.704 NTU W/10BASET
The MT334A MT334A will respond to Universal Loopback De-activate to clear
all central office loops.
5.22.30 USING THE V.52 (BER) TEST PATTERN GENERATOR
To use the V.52 BER tests in conjunction with the Remote Digital Loopback tests
(or with Local Line Loopback tests), follow these instructions:
1. Locate the “511/511E” toggle switch on the front panel of the MT334A
and move it UP. This activates the V.52 BER test mode and transmits a
“511” test pattern into the loop. If any errors are present, the local modem’s
red “ER” LED will blink sporadically.
2. If the above test indicates no errors are present, move the V.52 toggle
switch DOWN, activating the “511/E” test with errors present. If the test is
working properly, the local modem’s red “ER” LED will blink once per
second. A successful “511/E” test will confirm that the link is in place, and
that the MT334A’s built-in “511” generator and detector are
working properly.
Note
26
The above V.52 BER tests can be used independently of the Remote Digital Loopback tests. This requires two operators: one to initiate and monitor the tests at the local MT334A, and one to do the same at the remote
MT334A. In this case, the test pattern sent by each MT334A will not be
looped back, but will be transmitted down the line to the other MT334A.
While one operator initiates test, the other monitors for errors.
G.703/G.704 NTU W/10BASET
A. G.703/G.704 specifications
A.1 Network Data Rate
2.048 Mbps
A.2 Network Connector
RJ-48C/Dual Coax BNC
A.3 Nominal Impedance
75/120 ohm
A.4 Line Coding
Selectable AMI or HDB3
A.5 Line Framing
G.703 (Unframed) or G.704/G.732 (Framed)
A.6 CRC-4 Multiframing
Selectable On or Off
A.7 Clocking
Internal or Network (Receive Recover)
A.8 Time Slot Rate
64 kbps
27
G.703/G.704 NTU W/10BASET
A.9 Network Data Rates
64, 128, 192, 256, 320,384, 448, 512, 576, 640, 704, 768, 832, 896, 960, 1024,
1088, 1152, 1216, 1280, 1344, 1408, 1472, 1536, 1600, 1664, 1728, 1792, 1856,
1920, 1984, 2048 kbps
A.10 Distance
Maximum 1.8 km (6,000 ft.) on 24 AWG Cable
28
G.703/G.704 NTU W/10BASET
B. Ethernet 10Base-T specifications
B.1 DTE Interface
10Base-T on RJ-45F
B.2 DTE Data Rates
10Mbps
B.3 LAN Connection
RJ-45, 10Base-T, 802.3 Ethernet
B.4 Protocol
PPP (RFC 1661) with Bridging Control (RFC 1638)
B.5 MAC Address Table Size
4096 entries
B.6 MAC Address Aging
MAC addresses deleted after 8 minutes of inactivity
B.7 Frame Buffer
512 Frames
B.8 Frame Latency
1 frame
B.9 Diagnostics
V.54 Loopback; CSU Loopback; V.52 Patterns: 511
B.10 Indicators
E-1 Link, 10Base-T Link, Ethernet Status, Loss of Frame Sync, Error, Test Mode
29
G.703/G.704 NTU W/10BASET
B.11 Configuration
Two 8-Position DIP Switches
B.12 Power Supply
+5VDC external power supply 100–240VAC, 50–60Hz, 0.4A
B.13 Relative Humidity
Up to 90% non-condensing
B.14 Temperature
0 to 70° C
B.15 Dimensions
9.0 x 5.3 x 2.0 cm (3.5”L x 2.1”W x 0.78”H)
30
G.703/G.704 NTU W/10BASET
Notes
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
________________________________________________________________
31
®
BLACK BOX
®
NETWORK SERVICES
© Copyright 2006. Black Box Corporation. All rights reserved.
1000 Park Drive
•
Lawrence, PA 15055-1018
•
724-746-5500
•
Fax 724-746-0746