Alcatel MainStreet 2902 User manual

2902 MainStreet
Network Termination Unit | Release 1.0 H
TECHNICAL PRACTICES

PRINTED ON
RECYCLED PAPER
Alcatel assumes no responsibility for the accuracy of the information presented, which is subject to change without notice.
Alcatel, the Alcatel logo, MainStreet, and Newbridge are registered trademarks of Alcatel. All other trademarks are the property
of their respective owners.
Copyright 2002 Alcatel.
All rights reserved.
Disclaimers
Alcatel products are intended for commercial uses. Without the appropriate network design engineering, they must not be sold,
licensed or otherwise distributed for use in any hazardous environments requiring fail-safe performance, such as in the operation
of nuclear facilities, aircraft navigation or communication systems, air traffic control, direct life-support machines, or weapons
systems, in which the failure of products could lead directly to death, personal injury, or severe physical or environmental
damage. The customer hereby agrees that the use, sale, licence or other distribution of the products for any such application
without the prior written consent of Alcatel, shall be at the customer's sole risk. The customer hereby agrees to defend and hold
Alcatel harmless from any claims for loss, cost, damage, expense or liability that may arise out of or in connection with the use,
sale, licence or other distribution of the products in such applications.
This document may contain information regarding the use and installation of non-Alcatel products. Please note that this
information is provided as a courtesy to assist you. While Alcatel tries to ensure that this information accurately reflects
information provided by the supplier, please refer to the materials provided with any non-Alcatel product and contact the
supplier for confirmation. Alcatel assumes no responsibility or liability for incorrect or incomplete information provided about
non-Alcatel products.
Alcatel has made reasonable efforts to ensure that the 2902 MainStreet Network Termination Unit, Release 1.0, complies in all
material respects with the "Referenced Detailed Functional Specification for Newbridge Product Date Compliance" (for Load H
and beyond). To obtain this document and other information related to Year 2000 Date Compliance, visit the Alcatel Year 2000
Date Compliance website at the URL:
http://www.cid.alcatel.com/year2000/index.html
However, this does not constitute a representation or warranty. The warranties provided for Alcatel products, if any, are set forth
in contractual documentation entered into by Alcatel and its customers.
This document was originally written in English. If there is any conflict or inconsistency between the English version and any
other version of a document, the English version shall prevail.

2902 MainStreet Technical Practices iii
May 2002 90-2906-01
Preface
This document describes the technical practices for the 2902 MainStreet Network
Termination Unit, Release 1, software generic 82211. It includes the following
volumes.
•Installation describes how to install and ground a 2902 MainStreet system,
connect it to data equipment, primary rate links and node management
equipment, and how to power it up.
•Configuration provides the instructions on how to configure the node, its modules
and its connections.
•Maintenance explains maintenance functions and how to perform them.
•The glossary expands or defines acronyms and abbreviations.
•The index lists entries for Installation, Configuration and Maintenance.
Some systems do not include all the components or support all the features described
in this documentation. The components and features supported depend on the
components and system you have ordered and the system software generic release.
Conventions
This section describes the text conventions used throughout this document.

Preface
iv 2902 MainStreet Technical Practices
90-2906-01 May 2002
Special information
The following conventions are used to draw your attention to special information.
Procedure 1 Step procedure conventions
Step procedures provide instructions to perform a task. Step procedures may consist of
options and substeps. The following example outlines step procedure conventions.
1Steps are denoted by arabic numerals and describe actions that must be performed.
Complete each step in order. This step has substeps.
iSubsteps are denoted by roman numerals and detail the actions involved in a
complex step. Complete each substep in order.
ii At least two substeps appear.
2This step has options.
aOptions are denoted by letters and are conditional actions that depend on your
system requirements. Perform only the applicable option.
iOptions may contain substeps.
ii At least two substeps appear.
bAt least two options appear.
Danger — Danger means that the described activity or situation may
cause personal injury.
Warning — Warning means that the described activity or situation
may or will cause equipment damage.
Caution — Caution means that the described activity or situation
may or will cause service interruption.
Note — Notes provide supplementary information.

2902 MainStreet Technical Practices v
May 2002 90-2906-01
Mandatory regulations
The sections that follow outline the mandatory regulations governing the installation
and operation of the 2902 MainStreet Network Termination Unit. Adherence to these
instructions is necessary to ensure regulatory compliance.

Mandatory regulations
vi 2902 MainStreet Technical Practices
90-2906-01 May 2002
General requirements
Product safety
This equipment must be configured only with those assemblies specified in the
technical practices and must be mounted in the locations specified.
Prevention of unauthorized access
The 2902 MainStreet system is intended to be accessible only to authorized
personnel. This apparatus must be installed in a restricted access location or similar
environment, so that unauthorized user access is prevented.
Danger — There is a danger of explosion if the battery used in this
device is incorrectly replaced. Do not attempt battery replacement.
Return the equipment to your supplier for servicing when or if a
battery fault is suspected to be the cause of the equipment failure.
Where the law prohibits, do not discard the battery, or the equipment
with the battery; return it to your supplier for proper disposal.
The battery may present a fire or chemical burn hazard if mishandled.
Do not recharge, disassemble, heat above 100°C (212°F) or
incinerate.
Warning 1 — This unit contains no user-serviceable parts. Refer
servicing to qualified personnel.
Warning 2 — This equipment is Class I type and must be
permanently earthed for protection and for functional purposes. For
safe operation and servicing, the ac outlet must be installed near the
equipment and must be readily accessible. Use the appropriate ac
power cord and plug, as required by national standards.
Warning 3 — The equipment must be earthed. Where protection of
the user relies on a protective earth derived from a plug (for example,
the ac mains plug on the 2902 MainStreet unit), the connection to the
public network must be unplugged before the earth is disconnected.
The connection to the network must not be hard-wired.
Warning 4 — The power supply does not contain any
field-serviceable parts. Return it to the manufacturer for servicing.
Warning 5 — The unit uses a slow-blow type fuse with a 2 A, 250 V
rating (Sheet No V & Symbol T as per IEC60127). To ensure
continued fire protection, the replacement fuse must have the same
specifications as the original fuse.
Caution — To prevent accidental shorting of the modules, they must
be correctly aligned between the guides before insertion.

Mandatory regulations
2902 MainStreet Technical Practices vii
May 2002 90-2906-01
Earths
The 2902 MainStreet system has three types of earth:
•telecom safety earth (also known as functional earth)
•protective earth
•EDG (energy dumping ground)
The telecom safety earth connection is through pins designated as signal ground. The
telecom safety earth connector is located on the rear panel of the unit. See section 4.1
for specific instructions.
A green- and yellow-colored earth wire must be connected from the site equivalent
of the ac earth in accordance with IEEE Wiring Regulations (16th edition) and
HD384. This connection is made to the protective earth ground stud located on the
rear panel of the unit; see section 4.1 for specific instructions. The protective earth is
also carried by the mains plug and socket (for ac systems only).
The EDG connection is located on the rear panel of the unit.
The wire used for telecom safety earth, protective earth and EDG should be a
minimum of 1.5 mm2(AWG 16), green and yellow in color, and of sufficient length
to connect the building earth point to the unit. See section 4.1 for specific
instructions.
Equipment interconnection points
The interconnection points are defined as Safety Extra Low Voltage (SELV) (all
connectors on rear panel, except P1 and P2 optical connectors).
Connect SELV circuits on this equipment only to other circuits complying with the
requirements of SELV circuits as defined in CSA C22.2 No 60950, UL60950,
EN60950, AS/NZS 3260 and IEC60950.
Laser interface
The 2902 MainStreet unit uses a fiber-optic communications method and is a CLASS
1 LASER PRODUCT. Only trained, qualified service personnel thoroughly familiar
with laser radiation hazards should install or remove the fiber-optic cables and cards
in this system.
Electromagnetic compatibility
EMC compliance requires the use of:
•ferrite beads on all interface cables
•screened interface cables for Class B compliance
All Alcatel cables are shipped with the necessary special accessories required for
regulatory compliance.

Mandatory regulations
viii 2902 MainStreet Technical Practices
90-2906-01 May 2002
Install the appropriate ferrite beads as indicated in Table 1, and use shielded cables
for Class B installations. Ferrite beads must be attached at both ends of the cable, as
close as possible to the connector headshell, and secured with tie wraps. In addition,
the appropriate size must be selected to fit the cable diameter (see Figure 1).
Table 1 Ferrite beads for cables
Figure 1 Ferrite beads and tie wraps on cables
Product certification
Commercial part number Cable diameter
Steward 28A2025-0A2 5.08 to 6.35 mm
Steward 28A2029-0A2 7.62 to 9.91 mm
Steward 28A2024-0A2 9.53 to 12.70 mm
16521
Cable ties Connector Cable ties
Ferrite bead Ferrite bead
Connector
Note — Some products described in this manual may not comply
with the requirements of all markets where this product is sold, and
may only be placed on the market and installed where appropriately
certified to local requirements.

Mandatory regulations
2902 MainStreet Technical Practices ix
May 2002 90-2906-01
European regulations
The unit has been CE-marked in accordance with the requirements of European
Directive 1999/5/EC, the Radio and Telecommunications Terminal Equipment
Directive.
This product complies with the requirements of European Directive 73/23/ECC,
89/336/ECC and 91/263/ECC.
See the “Product safety” and “Electromagnetic compatibility” sections in “General
requirements” for installation requirements for regulatory approvals.
Telecoms
The E1 primary interface card (120 Ω) meets the requirements of European Directive
91/263/EEC.
United Kingdom regulations
This apparatus is intended to be accessible only to authorized personnel. This
apparatus must be installed in a locked room or similar environment, such that
unauthorized user access is prevented. Failure to prevent such user access will
invalidate any approval given to this apparatus.
Power supply cord wiring
The instructions for power supply cord and plug wiring are no longer mandatory. If
this information is required, consult the “Australian regulations” section for details,
since both countries have identical power supply cord and plug wiring requirements.
Norway regulations
Apparatus maa tilkobles jordet stikkontakt. Jordet Stikkontakt skal benyttes naar
apparatet tilkobles datanett.
The equipment must be connected to an earthed mains socket-outlet. An earthed
mains socket-outlet must be used when the equipment is connected to a data network.
Sweden regulations
Apparaten skall anslutas till jordat uttag nar den anslutas till ett natverk.
The product should be connected to a mains socket-outlet with earthing contact.
Switzerland regulations
The mains plug must comply with SEV/ASE 1011.

Mandatory regulations
x2902 MainStreet Technical Practices
90-2906-01 May 2002
Australian regulations
Power supply cord wiring
The cores in this mains lead are colored in accordance with the following code:
•green and yellow: earth
•blue: neutral
•brown: live
As the colors of the cores in the mains lead of this equipment may not correspond
with the colored markings identifying the terminals in the plug, proceed as follows
if power supply cord rewiring is required.
•The core that is colored green and yellow must be connected to the terminal in the
plug that is marked with the letter E or by the earth symbol, or colored green and
yellow.
•The core that is colored blue must be connected to the terminal that is marked
with the letter N or colored black.
•The core that is colored brown must be connected to the terminal that is marked
with the letter L or colored red.
Warning — This equipment must be earthed.

2902 MainStreet Technical Practices xi
May 2002 90-2906-01
Contents
Preface
Mandatory regulations
1 — Introduction 1-1
1.1 Product overview .............................................................................................. 1-2
1.2 Physical components ........................................................................................ 1-3
1.3 HDSL LIM overview .......................................................................................... 1-6
1.4 Optical LIM overview ........................................................................................ 1-8
1.5 Site selection .................................................................................................... 1-9
1.6 Installation summary ....................................................................................... 1-11
1.7 Installation tools and hardware required ......................................................... 1-11
2 — Unpacking and inspecting the shipment 2-1
2.1 Antistatic precautions ........................................................................................ 2-2
2.2 Unpacking and inspecting the shipment ........................................................... 2-2
2.3 Performing a startup test .................................................................................. 2-4
2.4 Repacking the shipment ................................................................................... 2-4
3 — Mounting the unit 3-1
3.1 Setting up the unit on a desk ............................................................................ 3-2
3.2 Mounting the unit in a rack ................................................................................ 3-2
3.3 Mounting the unit in a slide assembly ............................................................... 3-3

Contents
xii 2902 MainStreet Technical Practices
90-2906-01 May 2002
4 — Ground and power connections 4-1
4.1 Ground connections .......................................................................................... 4-2
4.2 Power connections ........................................................................................... 4-4
4.3 Securing slide assembly cable connections ..................................................... 4-4
4.4 Startup diagnostics ........................................................................................... 4-6
5 — Installing and removing modules 5-1
5.1 Control card modules ........................................................................................ 5-2
5.2 Opening the unit ............................................................................................... 5-2
5.3 Installing and removing primary rate modules .................................................. 5-3
5.4 Installing and removing data interface modules ............................................. 5-10
5.5 Installing and removing personality modules .................................................. 5-11
5.6 Replacing EPROMs ........................................................................................ 5-12
6 — Connecting to the network 6-1
6.1 Primary rate connections .................................................................................. 6-2
7 — Connecting to data devices 7-1
7.1 Data circuit connections .................................................................................... 7-2
7.2 Assembling an adapter for EIA/TIA-232 connections ....................................... 7-9
7.3 DB25-to-M34 cable pin and signal assignment .............................................. 7-20
8 — Connecting node management equipment 8-1
8.1 Node management equipment connections ..................................................... 8-2
9 — Connecting to external alarm equipment 9-1
9.1 External alarm connections .............................................................................. 9-2
10 — Node management 10-1
10.1 Node management overview .......................................................................... 10-2
10.2 Logging in to the NMTI ................................................................................... 10-2
10.3 NMTI screen display ....................................................................................... 10-4
10.4 NMTI main menus .......................................................................................... 10-6
10.5 Softkey menus ................................................................................................ 10-7
10.6 Logging out of the NMTI ................................................................................. 10-9
11 — Node parameters 11-1
11.1 System serial port parameters ........................................................................ 11-2
11.2 Date and time ................................................................................................. 11-6
11.3 Node number and node name ........................................................................ 11-7
11.4 Network Operations Center number ............................................................... 11-8
11.5 Access levels .................................................................................................. 11-9
11.6 Passwords .................................................................................................... 11-13
11.7 Viewing node parameters ............................................................................. 11-14

Contents
2902 MainStreet Technical Practices xiii
May 2002 90-2906-01
12 — Module position and circuit configuration 12-1
12.1 Module position and circuit identifiers ............................................................. 12-2
12.2 Module position configuration ......................................................................... 12-3
12.3 Module position displays ................................................................................. 12-4
12.4 Naming a module position .............................................................................. 12-8
12.5 Naming a circuit .............................................................................................. 12-8
12.6 Quick circuit configurations ............................................................................. 12-8
12.7 Viewing circuit status ...................................................................................... 12-9
13 — System timing and timing sources 13-1
13.1 System timing ................................................................................................. 13-2
13.2 Timing sources ............................................................................................... 13-3
13.3 Types of synchronization ................................................................................ 13-6
13.4 Class number .................................................................................................. 13-7
13.5 Failure threshold ............................................................................................. 13-8
13.6 Recovery condition ......................................................................................... 13-9
13.7 Intra- and inter-sector links .......................................................................... 13-10
13.8 Displaying the network configuration ........................................................... 13-12
14 — CPSS 14-1
14.1 CPSS overview ............................................................................................... 14-2
14.2 CPSS channel connections ............................................................................ 14-2
15 — E1 module operating parameters 15-1
15.1 E1 module overview ....................................................................................... 15-2
15.2 Network connectors ........................................................................................ 15-3
15.3 E1 framing format ........................................................................................... 15-4
15.4 Signal earthing (E1 G.703 LIM only) ............................................................... 15-4
15.5 Master/slave operation (E1 HDSL and Optical LIMs only) ............................. 15-6
15.6 Trunk conditioning .......................................................................................... 15-7
15.7 Fault classes ................................................................................................. 15-12
15.8 Alarm declaration and clearing times ............................................................ 15-13
15.9 E1 statistics ................................................................................................... 15-14
16 — E1 circuit operating parameters 16-1
16.1 E1 signaling type ............................................................................................ 16-2
16.2 E1 fault signaling ............................................................................................ 16-2
17 — DNIC and 2B1Q modules 17-1
17.1 Understanding DNIC and 2B1Q modules ....................................................... 17-2
17.2 DNIC and 2B1Q circuit configuration and operating parameters .................... 17-2
17.3 Device mode ................................................................................................... 17-3
17.4 Device gender ................................................................................................. 17-4
17.5 Duplex method ............................................................................................... 17-5
17.6 RTS/CTS delay ............................................................................................... 17-5
17.7 Control signals ................................................................................................ 17-6
17.8 Data structure (asynchronous only) ................................................................ 17-7

Contents
xiv 2902 MainStreet Technical Practices
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17.9 Clocking (synchronous only) ........................................................................... 17-9
17.10 Multidrop data bridge .................................................................................... 17-12
17.11 Super-rate configuration for DNIC or 2B1Q modules ................................... 17-13
17.12 Loss-of-synchronization debounce time (DNIC only) ................................... 17-14
18 — RS-232 DCM 18-1
18.1 Understanding the RS-232 DCM .................................................................... 18-2
18.2 RS-232 DCM circuit operating parameters .................................................... 18-2
18.3 Device mode ................................................................................................... 18-3
18.4 Device gender ................................................................................................. 18-3
18.5 Full duplex ...................................................................................................... 18-4
18.6 RTS/CTS delay ............................................................................................... 18-4
18.7 Control signals ................................................................................................ 18-5
18.8 Data structure (asynchronous only) ................................................................ 18-6
18.9 Clocking (synchronous only) ........................................................................... 18-7
18.10 Multidrop data bridge ...................................................................................... 18-9
19 — X.21 and V.35 DCMs 19-1
19.1 Understanding X.21 and V.35 DCMs .............................................................. 19-2
19.2 X.21 and V.35 circuit operating parameters ................................................... 19-2
19.3 Device mode ................................................................................................... 19-4
19.4 Device gender ................................................................................................. 19-4
19.5 Duplex method ................................................................................................ 19-5
19.6 RTS/CTS delay ............................................................................................... 19-6
19.7 Control signals ................................................................................................ 19-7
19.8 Data structure (asynchronous only) ................................................................ 19-8
19.9 Clocking (synchronous only) ........................................................................... 19-9
19.10 Multidrop data bridge .................................................................................... 19-12
19.11 Super-rate configuration for the X.21 and V.35 DCMs ................................. 19-13
20 — Codirectional DCM 20-1
20.1 Understanding the Codirectional DCM ........................................................... 20-2
20.2 Codirectional DCM Module and circuit parameters ........................................ 20-2
20.3 Trunk conditioning .......................................................................................... 20-3
20.4 Alarm times ..................................................................................................... 20-3
20.5 8 kHz timing ................................................................................................... 20-4
20.6 All Ones alarm indication signal ...................................................................... 20-4
21 — Transparent rate adaption 21-1
21.1 Rate adaption overview .................................................................................. 21-2
21.2 Transparent rate adaption overview ............................................................... 21-2
21.3 Transport bandwidth ....................................................................................... 21-3
21.4 Transport position ........................................................................................... 21-5
22 — HCM rate adaption 22-1
22.1 Rate adaption overview .................................................................................. 22-2
22.2 HCM rate adaption overview .......................................................................... 22-2

Contents
2902 MainStreet Technical Practices xv
May 2002 90-2906-01
22.3 Transport bandwidth ....................................................................................... 22-3
22.4 Transport position ........................................................................................... 22-5
22.5 Signaling and the signaling bit stream ............................................................ 22-5
22.6 Interface speed ............................................................................................... 22-6
22.7 Data position ................................................................................................... 22-8
23 — Cross-connecting circuits 23-1
23.1 Types of cross-connections ............................................................................ 23-2
23.2 Simple connections ......................................................................................... 23-2
23.3 Connecting super-rate circuits ........................................................................ 23-4
23.4 Circuit connections display ............................................................................. 23-5
23.5 Protecting connections (RAPID protection switching) .................................... 23-5
23.6 Disconnecting connections ........................................................................... 23-10
24 — Visual indicators 24-1
24.1 LEDs ............................................................................................................... 24-2
24.2 Front panel LEDs ............................................................................................ 24-2
24.3 Rear panel LEDs ............................................................................................ 24-4
24.4 Interface module LEDs ................................................................................... 24-6
25 — Alarms 25-1
25.1 Alarms and alarm queues ............................................................................... 25-2
25.2 Viewing alarm queues .................................................................................... 25-4
25.3 Acknowledging alarms .................................................................................... 25-6
25.4 Deleting alarms ............................................................................................... 25-7
25.5 Reclassifying configurable alarms ................................................................. 25-7
25.6 Logging alarms ............................................................................................... 25-9
25.7 External alarms ............................................................................................. 25-10
26 — System diagnostics 26-1
26.1 Diagnostic tests .............................................................................................. 26-2
26.2 Background diagnostics .................................................................................. 26-3
26.3 Directed diagnostics ....................................................................................... 26-4
26.4 Viewing diagnostics ........................................................................................ 26-5
26.5 Busy-out circuits ............................................................................................. 26-6
26.6 Signaling leads ............................................................................................... 26-7
26.7 Displaying module and Control card maintenance information .................... 26-10
26.8 Resetting a module or the Control card ........................................................ 26-10
27 — Loopbacks 27-1
27.1 Using loopbacks ............................................................................................. 27-2
27.2 2B1Q circuit loopbacks ................................................................................... 27-3
27.3 DNIC circuit loopbacks ................................................................................... 27-6
27.4 Data circuit loopbacks ................................................................................... 27-11
27.5 Primary rate circuit loopbacks ....................................................................... 27-13
27.6 Primary rate link loopbacks ........................................................................... 27-15

Contents
xvi 2902 MainStreet Technical Practices
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28 — Statistics 28-1
28.1 Synchronization statistics ............................................................................... 28-2
28.2 FAS and CRC4 statistics ................................................................................ 28-3
28.3 Codirectional DCM quality statistics ............................................................... 28-7
29 — CPSS maintenance 29-1
29.1 Routing information ......................................................................................... 29-2
29.2 CPSS grooming .............................................................................................. 29-5
30 — Database management 30-1
30.1 Backing up, verifying, and restoring the configuration database .................... 30-2
30.2 Viewing and resetting the nonvolatile memory ............................................... 30-5
31 — Hardware maintenance procedures 31-1
31.1 Measuring the power rails ............................................................................... 31-2
31.2 Testing and replacing the fuse ........................................................................ 31-3
32 — Primary rate link bypass 32-1
32.1 Initiating a primary rate link bypass ................................................................ 32-2
Glossary
lndex

2902 MainStreet Technical Practices 1-1
May 2002 90-2906-01
1 — Introduction
1.1 Product overview 1-2
1.2 Physical components 1-3
1.3 HDSL LIM overview 1-6
1.4 Optical LIM overview 1-8
1.5 Site selection 1-9
1.6 Installation summary 1-11
1.7 Installation tools and hardware required 1-11

1 — Introduction
1-2 2902 MainStreet Technical Practices
90-2906-01 May 2002
1.1 Product overview
The 2902 MainStreet Network Termination Unit is a high-speed NTU for data
devices. The 2902 MainStreet unit also provides CEPT voice bypass capability. It
supports two E1 primary rate interfaces and two data interface modules. HDSL
technology allows connection to E1 lines using twisted copper pairs, without
repeaters.
The 2902 MainStreet unit gives customers access to public and private switched
networks. It can be used in point-to-point, or drop and insert configurations. The unit
also features circuit protection switching, bypass operation, subrate and super-rate
connections, system diagnostics, statistics collection, line and circuit maintenance
testing, alarm collection, and database management functions.
The E1 HDSL and E1 Optical LIMs allow the 2902 MainStreet unit to serve as a
high-speed NTU, providing low-cost, high-speed X.21 or V.35 circuits for LAN
interconnection. E1 G.703 LIMs can also provide high-speed connections to an E1
network. Additionally, an E1 G.703 LIM can be used as a tributary connection to a
PBX, allowing voice bypass connections to an E1 HDSL, E1 Optical, or another E1
G.703 LIM.
Figure 1-1 shows the exterior of a desktop unit. The unit can be placed on a desktop
or, with the appropriate hardware, adapted for a rack. Physical connections to
primary rate lines can be made through BNC or RJ45 connectors.
Figure 1-1 2902 MainStreet Network Termination Unit
The system uses customer-installed modules to connect to E1 lines and data devices.
E1 lines connect to a 2902 MainStreet unit through the following line interface
modules:
•E1 G.703 LIM
•E1 HDSL LIM
•E1 HDSL LIM2
•E1 Optical LIM
8827
Power
Event Status
SystemStatus
Processor
Out of Sync 1
Out of Sync2
2902 MainStreet
Network Termination Unit

1 — Introduction
2902 MainStreet Technical Practices 1-3
May 2002 90-2906-01
Data devices connect to a 2902 MainStreet unit through the following data interface
modules:
•RS-232 DCM
•V.35 DCM
•X.21 DCM
•Codirectional DCM
•DNIC module
•2B1Q module
1.2 Physical components
The 2902 MainStreet system has three major physical components:
•chassis
•power supply
•Control card
Figure 1-2 identifies the components for the unit.
Figure 1-2 2902 MainStreet unit (interior, rear view)
9058
Power
supply
Protective
earth
Power
switch Fuse
holder
Power
receptacle
Seven-segment
display
Loopback
LEDs
Status LED
EDG
and Sig/Gnd
Slot 1
Slot 2
(P1)
Primary rate
interface
modules
Data interface modules
Control card
position (1)
Personality
modules
Line-1
Line-2
Modem
Terminal
Alarm
Rx-1 Tx-1
Rx-2 Tx-2
Line-1
Slot 2
Slot 1 Line-2 Modem Terminal
Rx-1 Tx-1 Rx-2 Tx-2 Alarm
Loop
Display
Status
21U
O
I
EDG
Sig/Gnd
position (2)
P1 P2
P2
P1
(P2)

1 — Introduction
1-4 2902 MainStreet Technical Practices
90-2906-01 May 2002
Chassis
The chassis acts as a mechanical base for the Control card, power supply and
connectors. The top is attached with screws and, once removed, provides access to
the Control card, its modules and the power supply.
The front panel has LEDs that indicate the status of the power supply, the alarms, the
processor and the primary rate links. The rear panel has LEDs that indicate the status
of the Control card and loopbacks, and a seven-segment display that indicates the
number of major alarms. All power and signal connections are made at the rear panel.
Power supply
The self-contained power supply is mounted inside the unit, above the Control card.
It receives its power connection from the power connector module, which contains
an EMI filter, fuse holder and power switch.
Control card
The Control card is a multilayered printed circuit board that performs functions
common to the entire system. It contains the system software and configuration
memory, and supports up to two E1 primary rate LIMs and up to two data interface
modules. Figure 1-3 shows the location of the modules.
The Control card provides connectors for network interfaces, data devices, serial
ports and external alarm devices. It also supports several LED indicators that can be
seen from the back panel (see Figure 1-2).
Figure 1-3 Control card modules
8840
Personality
modules
(Slot 2/Slot 1)
EPROMs
Interface
module
(position 2)
Interface
module
(position 1)
341 2
LIM (P1)
Jumper blocks
(J37, J40)
Jumper blocks
(J41, J44)
LIM (P2)