Nortel DMS-100 Series User manual

297-8223-550
DMS 100 Family
Remote Switching Center
Remote Switching Center Multi-Access Maintenance Manual
XPM11 and up Standard 04.02 November 2000

DMS 100 Family
Remote Switching Center
Remote Switching Center Multi-Access Maintenance Manual
Publication number: 297-8223-550
Product release: XPM11 and up
Document release: Standard 04.02
Date: November 2000
Copyright © 1996-2000 Nortel Networks,
All Rights Reserved
Printed in the United States of America
NORTEL NETWORKS CONFIDENTIAL: The information contained herein is the property of Nortel Networks and is
strictly confidential. Except as expressly authorized in writing by Nortel Networks, the holder shall keep all information contained
herein confidential, shall disclose the information only to its employees with a need to know, and shall protect the information, in
whole or in part, from disclosure and dissemination to third parties with the same degree of care it uses to protect its own
confidential information, but with no less than reasonable care. Except as expressly authorized in writing by Nortel Networks, the
holder is granted no rights to use the information contained herein.
Information is subject to change without notice. Nortel Networks reserves the right to make changes in design or components as
progress in engineering and manufacturing may warrant. Changes or modification to the DMS-100 without the express consent of
Nortel Networks may void its warranty and void the users authority to operate the equipment.
Nortel Networks, the Nortel Networks logo, the Globemark, How the World Shares Ideas, Unified Networks, DMS, DMS-100,
Helmsman, MAP, Meridian, Nortel, Northern Telecom, NT, SuperNode, and TOPS are trademarks of Nortel Networks.

DMS-100 Family Remote Switching Center Multi-Access Maintenance Manual XPM11 and up
iii
Contents
Remote Switching Center Multi-Access Maintenance Manual
About this document vii
How to check the version and issue of this document vii
References in this document vii
What precautionary messages mean vii
How commands, parameters, and responses are represented ix
Input prompt (>) ix
Commands and fixed parameters ix
Variables ix
Responses ix
1 RSC-M maintenance introduction 1-1
2 Maintenance overview 2-1
Hardware description 2-2
Common peripheral module 2-2
Modular supervisory panel in RSC-M 2-3
Functional description 2-13
In-service firmware downloading 2-13
RSC-M 2-17
Extended Distance Capability 2-22
Peripheral communication 2-23
Emergency stand-alone operation 2-25
Signaling 2-25
RSC-M maintenance 2-26
RSC-M maintenance 2-26
RSC-M node maintenance 2-27
RSC-M carrier maintenance 2-28
RSC-M lines maintenance 2-31
RSC-M call process 2-35
Computing module data synchronization 2-35
To Update static data 2-36
Return the RSC-M to service 2-40
Switch of activity 2-41
Fault conditions 2-48
RSC-M 2-48

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297-8223-550 Standard 04.02 November 2000
Automatic maintenance 2-59
Routine exercise test 2-59
Overload resources 2-66
Escalation to manual maintenance 2-66
3 RSC-M hardware 3-1
Hardware components 3-1
CPM packaging 3-1
CPM cabinet 3-1
Single-cabinetized RSC-M configuration 3-2
Provisioning 3-3
4 RSC-M Signaling and Communications 4-1
Signaling and communications protocols 4-1
CAS protocol 4-1
Signaling and communications types 4-2
RSC-M call setup protocol 4-3
CAS to BTUP and BTUP to CAS signaling 4-4
DC5 to BTUP and BTUP to DC5 signaling 4-11
5 RSC-M alarm clearing procedures 5-1
Ext RSC-M/RCO2 RSC-M cabinet with MSP shelf major 5-2
PM RSC-M/RCO2 critical 5-10
PM RSC-M/RCO2 major 5-22
PM RSC-M/RCO2 minor 5-33
6 RSC-M card replacement procedures 6-1
NT6X69 in an RSC-M 6-2
NT6X78 in an RSC-M 6-12
NT6X92 in an RSC-M 6-19
NTMX72 in an RSC-M 6-26
NTMX73 in an RSC-M 6-34
NTMX74 in an RSC-M 6-41
NTMX75 in an RSC-M 6-50
NTMX76 in an RSC-M 6-57
NTMX77 in an RSC-M 6-64
NTMX79 in an RSC-M 6-71
NTMX82 in an RSC-M 6-77
NTMX87 in an RSC-M 6-88
NTRX41 in an RSC-M/MSP 6-100
NTRX42 in an RSC-M/MSP 6-105
NTRX43 in an RSC-M/MSP 6-117
NTRX54 in an RSC-M/MSP 6-125
Returning a card for repair or replacement in an RSC-M/RCO2 6-132
7 Locating and clearing RSC-M trouble 7-1
8 RSC-M trouble isolation and correction 8-1
Troubleshooting the RSC-M 8-1

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DMS-100 Family Remote Switching Center Multi-Access Maintenance Manual XPM11 and up
Trouble condition indicators 8-1
Locating and clearing faults 8-3
Fault isolation program 8-4
Office recovery program 8-4
User interface for the RSC-M at the PM level of the MAP display 8-5
User interface for external alarms 8-12
User interface for carrier maintenance 8-12
Fault isolation tests 8-15
Handling a SysB RSC-M unit 8-15
Handling an ISTb RSC-M unit 8-16
Handling data mismatch 8-16
Handling an IMC link fault 8-16
Diagnostic tests 8-20
XPM diagnostic history 8-20
ROM diagnostic 8-28
Matrix card diagnostic 8-29
Sync diagnostics for the NTMX73 circuit card 8-29
Message diagnostic 8-30
Tones diagnostic 8-30
Speech path diagnostic 8-31
P-side loop diagnostic 8-31
CMR diagnostic 8-31
9 RSC problem solving chart 9-1
10 RSC-M advanced troubleshooting procedures 10-1
Powering up the RSC-M 10-1
Powering down the RSC-M 10-2
11 RSC-M recovery procedures 11-1
Recovering an out-of-service RSC-M/RCO2 11-2
12 RSC-M routine maintenance procedures 12-1
Checking torque on grounding bolts 12-2
Cooling unit replacement 12-5
Inspecting and changing bulbs 12-8
Inspecting cooling unit filters 12-12
Replacing cooling unit filters 12-16
Testing power converter voltages 12-20
Testing wrist strap grounding cords 12-24

DMS-100 Family Remote Switching Center Multi-Access Maintenance Manual XPM11 and up
vii
About this document
How to check the version and issue of this document
The version and issue of the document are indicated by numbers, for example,
01.01.
The first two digits indicate the version. The version number increases each
time the document is updated to support a new software release. For example,
the first release of a document is 01.01. In the next software release cycle, the
first release of the same document is 02.01.
The second two digits indicate the issue. The issue number increases each
time the document is revised but rereleased inthe same software release cycle.
For example, the second release of a document in the same software release
cycle is 01.02.
To determine which version of this document applies to the software in your
office and how documentation for your product is organized, check the release
information in Product Documentation Directory, 297-8991-001.
References in this document
The following documents are referred to in this document:
•1-Meg Modem Servicoe Network Implementation Guide, 297-8063-200
•North American DMS-100 Log Report Manual
•North American DMS-100 Translations Guide
•Alarm Clearing Procedures
•Card Replacement Procedures
•XPM Operational Measurements Reference Manual
•PMDEBUG Users Guide, TAM-1001-004
What precautionary messages mean
The types of precautionary messages used in NT documents include attention
boxes and danger, warning, and caution messages.

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297-8223-550 Standard 04.02 November 2000
An attention box identifies information that is necessary for the proper
performance of a procedure or task or the correct interpretation of information
or data. Danger, warning, and caution messages indicate possible risks.
Examples of the precautionary messages follow.
ATTENTION - Information needed to perform a task
DANGER - Possibility of personal injury
WARNING - Possibility of equipment damage
ATTENTION
If the unused DS-3 ports are not deprovisioned before a DS-1/VT
Mapper is installed, the DS-1 traffic will not be carried through the
DS-1/VT Mapper, even though the DS-1/VT Mapper is properly
provisioned.
DANGER
Risk of electrocution
Do not open the front panel of the inverter unless fuses F1,
F2, and F3 have been removed. The inverter contains
high-voltage lines. Until the fuses are removed, the
high-voltage lines are active, and you risk being
electrocuted.
WARNING
Damage to the backplane connector pins
Align the card before seating it, to avoid bending the
backplane connector pins. Use light thumb pressure to
align the card with the connectors. Next, use the levers on
the card to seat the card into the connectors.

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DMS-100 Family Remote Switching Center Multi-Access Maintenance Manual XPM11 and up
CAUTION - Possibility of service interruption or degradation
How commands, parameters, and responses are represented
Commands, parameters, and responses in this document conform to the
following conventions.
Input prompt (>)
An input prompt (>) indicates that the information that follows is a command:
>BSY
Commands and fixed parameters
Commands and fixed parameters that are entered at a MAP terminal are shown
in uppercase letters:
>BSY CTRL
Variables
Variables are shown in lowercase letters:
>BSY CTRL ctrl_no
The letters or numbers that the variable represents must be entered. Each
variable is explained in a list that follows the command string.
Responses
Responses correspond to the MAP display and are shown in a different type:
FP 3 Busy CTRL 0: Command request has been submitted.
FP 3 Busy CTRL 0: Command passed.
CAUTION
Possible loss of service
Before continuing, confirm that you are removing the card
from the inactive unit of the peripheral module.
Subscriber service will be lost if you remove a card from
the active unit.

DMS-100 Family Remote Switching Center Multi-Access Maintenance Manual XPM11 and up
1-1
1 RSC-M maintenance introduction
The Remote Switch Center Multi-Access (RSC-M) is a remote common
peripheral module (CPM) designed to support time division multiplexers
(TDM). The support of European Telecommunications Standards Institute
(ETSI) protocols by Digital Multiplex Systems (DMS) provides plain old
telephone services (POTS) on international multi-vendor remotes.
The RSC-M is from the Remote Switching Center Overseas (RCO2) shelf, a
componentof theRemote SwitchingCenter-SONET (RSC-S)cabinet. Within
this document, references to the RCO2 shelf apply to the shelf configured in
the RSC-M cabinet. For the purpose of explanation, the document will refer
to the shelf as an RSC-M shelf.
An RSC-M connects to a DMS-100 host peripheral, the line group controller
offshore (LGCOi+). The LGCOi+ uses 2 to 16 pulse code modulation
(PCM30) links. Datafill tables and MAP displays indicate that the PLGC is
the host peripheral. This document refers to the LGCOi+ i as a PCM30 line
group controller (PLGC).
Note: One LGCOi+ supports a maximum of two RSC-M main and
extension shelves.
The stand-alone version of the RSC-M referred to in this document will
provide the following protocols. The protocols refer to the lines terminating
on remote multi-vendor AMC nodes:
• LOOP
• EARTH
• DC5A
• DC5ADD
The RSC-M cabinet supports only channel associated signaling (CAS) lines.
The CAS maintenance messaging for the RSC-M peripheral will indicate
Global Peripheral Platform (GPP) or RCO2 as the PM type. The software

1-2 RSC-M maintenance introduction
297-8223-550 Standard 04.02 November 2000
requires an upgrade. Then the software indicates the addition of the RSC-M
PM type for messages and defaults to the GPP. This is a host from a base of a
CAS peripheral, or the RCO2.
The RSC-M supports an access multiplexer capability (AMC) interface to
public switched telephone networks (PSTN) that use CAS protocol with
dedicated bearer (voice) channels. Each subscriber line on a CAS AMC is
mapped to a specified voice channel on a PCM30 link. The RSC-M PCM30
links connected to CAS AMCs support 30 voice channels.
A RSC-M main shelf can support up to 22 PCM30 links. Each half extension
(EXT) shelf can support an additional 24 PCM30 links. The RSC-M main
shelf can support a total of 46 PCM30 links. A full RSC-M consists of one
main and one EXT shelf. A RSC-M can support a maximum of 1380 lines for
CAS AMC.
AnRSC-Mcabinethouses three RSC-MmainshelvesplusonefullEXTshelf.
This configuration provides a total maximum capacity of 114 PCM30 links in
a cabinet. There must be at least one RSC-M main shelf configured in a
cabinet. The following figures illustrate the RSC-M configuration.

RSC-M maintenance introduction 1-3
DMS-100 Family Remote Switching Center Multi-Access Maintenance Manual XPM11 and up
Figure 1-1 RSC-M main and ext shelf configuration
RSC-M main
shelf
PCM30
47
CAS AMC6
1200
1380
0
15
CAS AMC1
1
240
0
.
.
.
.
.
.
.
.
.
.
7
40
RSC-M ext
shelf
PCM30
21
24

1-4 RSC-M maintenance introduction
297-8223-550 Standard 04.02 November 2000
Figure 1-2 CPM cabinet for RSC-M applications
RSC-M main shelf
RSC-M
Extension shelf
left
RSC-M main shelf
(provisionable)
RSC-M cabinet
RSC-M main shelf
(provisionable)
RSC-M
Extension shelf
right

DMS-100 Family Remote Switching Center Multi-Access Maintenance Manual XPM11 and up
2-1
2 Maintenance overview
This section of the Remote Switching Center Multi-access (RSC-M)
Maintenance Manual contains a summary of components. These components
form the interface to multi-vendor access nodes. This section describes
cabinetized modular supervisory panel (MSP) and power components of the
RSC-M. This section provides descriptions of how software processes affect
RSC-M components, and highlights voice and message flows. Northern
Telecom (Nortel) digital multiplex switches use access multiplexer capability
(AMC) nodes to communicate.
This chapter contains the following sections:
• hardware description
• operating description
• RSC-M maintenance
• fault conditions
• automatic maintenance
• increase to manual maintenance
The RSC-M supports channel associated signaling (CAS) AMCs. A CAS line
is a 64 Kb/s channel in a 2 Mb/s pulse coded modulation (PCM30) carrier. The
CAS lines use a call supervisory signaling protocol. This protocol requires
ABCD control bits. These bits must be sent on timeslot (TS) 16 of each
associated PCM30 link. The channels are entered as Meridian Digital Centrex
(MDC) lines, as if the carrier channels were line cards.
When fault conditions occur, the RSC-M and the Digital Multiplex System
(DMS) attempt to pinpoint the fault with system action like audits. If possible,
the DMS-100 switch corrects the fault automatically and manual interruption
is not required. If the fault requires manual interruption, the system indicates
the correct trouble indicators. The section on automatic maintenance includes
examples of appropriate trouble indicators.

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297-8223-550 Standard 04.02 November 2000
Hardware description
This section describes the components of the cabinetized frame. The
components include the MSP, RSC-M, and half extension (EXT) shelves. The
AMCs are virtual entities to the DMS. The hardware description section does
not include virtual entities to the DMS. This section also describes Human
machine interface (HMI) commands that allow maintenance personnel access
to node status.
The RSC-M is a standard DMS Streamline Model B C28 that contains four
shelves. The system one shelf as an RSC-M main shelf. The system can
provision additional RSC-M main shelves and EXT half-shelves. The
following descriptions define the maximum channel. The maximum channel
carries the capability of RSC-M shelves in common peripheral module (CPM)
cabinets.
• A maximum of 16 PCM30 links connect each RSC-M main shelf to a
PCM-30 line group controller (PLGC). This condition occurs on the
control-side (C-side). A total of 16 C-side links are supported. Traffic
studies indicate fewer than 10 C-side links are necessary to support 46
peripheral-side (P-side) links. The maximum C-side capacity of a cabinet
with three RSC-M main shelves is 1380 DSO channels.
• On the P-side, each RSC-M main shelf can support a maximum of 22
PCM30carrier linksto theremote. An RSC-M half-shelfEXT modulecan
support another 24 PCM30 carrier links, for a total of 46 PCM30 links.
The system obtains the maximum RSC-M P-side capacity. The system
obtains this capacity when the CPM cabinet is configured with three
RSC-M main shelves and two half-shelf EXT modules. The total is 114
PCM30 links.
• AnRSC-M main shelf and half-shelfhosting CAScan supporta maximum
of 1380 lines. These lines have 46 PCM30 links with 30 channels each. A
maximum configured RSC-M can host 3420 CAS lines on remote nodes.
A maximum configured RSC-M has three main shelves and two EXT
half-shelves.
Common peripheral module
The RSC-M uses CPM architecture instead of XMS-based peripheral module
(XPM) architecture.

Maintenance overview 2-3
DMS-100 Family Remote Switching Center Multi-Access Maintenance Manual XPM11 and up
When the RSC-M uses a CPM instead of an XPM, the following differences
are implemented:
• enhancement of the matrix
• creation of the PCM circuit card to concentrate all signaling functions in
one circuit card
• addition of receivable firmware to the Unified Processor (UP) (NTMX77)
and PCM Signaling Processor (NTMX73)
The following section describes these components according to operating
areas. In each operating area, the functions of specific cards are highlighted
and other RSC-M components are presented.
Modular supervisory panel in RSC-M
The following sections describe MSP components.
Alarm module
The alarm module (NTRX41AA) circuit card provides monitoring and alarm
reporting for cabinets in a central office (CO) environment. This circuit card
operates with an input battery voltage of -48V or -60V. The circuit card is
provided with the MSP.
The NTRX41AA circuit card detects and monitors the following fault
conditions:
• converter faults
• thermal breaker failures
• fan failure on one or two cooling units
• inverter failure in the cabinet
If these conditions occur, the NTRX41AA circuit card raises alarms and sends
signals to the office alarm unit. The NTRX41AA circuit card provides
maintenance facilities in the form of operating, data and alarm battery supply
(ABS) jacks.
The NTRX41AA circuit card has the following functional blocks:
• alarm circuit
• maintenance

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297-8223-550 Standard 04.02 November 2000
Alarm circuit The alarm circuit consists of transistor logic that the
following alarm inputs activate:
• battery-input voltage that triggers a FRAMEFAIL signal for an inverter
alarm, talk battery module alarm, or fuse module alarm
• battery-return voltage that triggers a FRAMEFAIL signal for a converter
fail alarm
• battery-input voltage that generates a FANFAIL signal and triggers an
alarm for the cooling units
The alarm circuit provides two light-emitting diodes (LED) as visual
indicators of the FRAMEFAIL and FANFAIL signals. The alarm circuit uses
a connector interface to drive two additional external LEDs.
Maintenance The NTRX41AA circuit card provides many maintenance
features like jacks for operating, data and ABS. These features provide for
interoffice communication and data transmission.
The following figure shows the relationship of NTRX41AA circuit card
functional blocks.
Figure 2-1 NTRX41AA functional blocks
Fuse modules
Breaker
modules
Cooling unit 1
Alarm circuit
Office alarm
Inverter
Visual
indicators
Remote alarm
circuit
Maintenance
Cooling unit 2
Visual
indicators
ABS
NTRX41AA