Nortel DMS-100 Series User manual

ABSK007 Standard 02.02 April 1999
297-8381-550
DMS-100 Family
Remote Line Concentrating Module with
Extended Distance Capability
Maintenance Manual

DMS-100 Family Maintenance Manual ABSK007
DMS-100 Family
Remote Line Concentrating Module with Extended
Distance Capability
Maintenance Manual
1996, 1998, 1999 Northern Telecom
All rights reserved
Printed in the United States of America
NORTHERN TELECOM CONFIDENTIAL: The information contained in this document is the property of Northern
Telecom. Except as specifically authorized in writing by Northern Telecom, the holder of this document shall keep the
information contained herein confidential and shall protect same in whole or in part from disclosure and dissemination to third
parties and use same for evaluation, operation, and maintenance purposes only.
Information is subject to change without notice. Northern Telecom reserves the right to make changes in design or components
as progress in engineering and manufacturing may warrant.
This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC
Rules, and the radio interference regulations of the Canadian Department of Communications. These limits are designed to
provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the in-
struction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be required to correct the interference at the user’s own expense
Allowing this equipment to be operated in such a manner as to not provide for proper answer supervision is a violation of Part
68 of FCC Rules, Docket No. 89-114, 55FR46066 This equipment is capable of providing users with access to interstate pro-
viders of operator services through the use of equal access codes. Modifications by aggregators to alter these capabilities is a
violation of the Telephone Operator Consumer Service Improvement Act of 1990 and Part 68 of the FCC Rules
DMS
, DMS SuperNode , MAP, and NT are trademarks of Northern Telecom.
Publication number: 297-8381-550
Product release: ABSK007
Document release: Standard 02.02
Date: April 1999

DMS-100 Family Maintenance Manual ABSK007
iii
Contents
About this document vii
When to use this document vii
How to check the version and issue of this document vii
References in this document viii
What precautionary messages mean viii
How commands, parameters, and responses are represented ix
Input prompt (>) ix
Commands and fixed parameters ix
Variables ix
Responses x
Maintenance overview 1-1
Introduction 1-1
Functional overview 1-1
Hardware description 1-2
General configuration 1-2
Line concentrating module 1-3
LCA shelf configuration 1-5
LCM control complex cards 1-7
Line drawers 1-33
Functional description 1-36
HIE description 1-38
Remote maintenance module 1-43
Multiplex facility transmission equipment 1-48
Frame supervisory panel (FSP) 1-48
Cooling unit 1-50
Software description 1-51
Functional limitations 1-52
Fault conditions 1-53
LCA shelf failure 1-53
Line drawer faults 1-53
Link failure 1-54
Load file mismatch 1-55
Automatic maintenance 1-55
RLCM-EDC audits 1-55
Checksums 1-56
LCM LTC speech path diagnostics enhancements 1-57
Overload resources 1-58
Takeover capability 1-59
RMM maintenance 1-60

iv Contents
297-8381-550 Standard 02.02 April 1999
Drawer testing 1-61
LCM REXTEST 1-62
System REX controller: XPM maintenance 1-64
Escalation to manual maintenance 1-70
Alarm conditions 1-70
Subscriber lines manual maintenance 1-71
Drawer maintenance 1-71
Signaling for RLCM-EDC 2-1
Signaling for RLCM-EDC 2-1
Signaling and communications protocols 2-1
RLCM-EDC signaling links 2-1
Signaling protocol 2-4
Signaling functions 2-8
DS-30A links 2-10
Electronic business set signaling 2-10
RLCM-EDC hardware 3-1
RLCM-EDC hardware components 3-1
Hardware configuration 3-1
Line concentrating module 3-3
HIE 3-4
FSP 3-4
RMM 3-5
Cooling unit (CU) 3-5
RLCM-EDC recovery procedures 4-1
RLCM-EDC recovery procedure 4-2
RLCM-EDC alarm clearing procedures 5-1
PM LCM critical 5-2
PM LCM major 5-15
Ext FSP RLCC-EDC cabinet major 5-25
PM RMM major 5-47
PM LCM minor 5-57
PM RMM minor 5-69
RLCM-EDC card replacement procedures 6-1
NT0X10 in RMM 6-2
NT0X91 in FSP 6-6
NT2X06 in RMM 6-17
NT2X09 in RMM 6-23
NT2X10 in RMM 6-29
NT2X11 in RMM 6-33
NT2X57 in RMM 6-37
NT2X59 in RMM 6-41
NT2X70 in HIE 6-48
NT2X90 in RMM 6-57
NT3X09 in RMM 6-64
NT6X21 in LCM 6-69
NT6X36 in FSP 6-73
NT6X50 in HIE 6-78

Contents v
DMS-100 Family Maintenance Manual ABSK007
NT6X51 in LCM 6-86
NT6X52 in LCM 6-91
NT6X53 card in LCM 6-96
NT6X54 in LCM 6-103
NT6X73 in HIE 6-109
NT6X74 in RMM 6-113
Replacing a card RLCM-EDC 6-121
Replacing a line card in an LCM 6-127
Locating and clearing RLCM-EDC problem procedures 7-1
Trouble isolation and correction 8-1
Description of troubleshooting procedures 8-1
Performance indicators 8-1
Locating and clearing faults 8-3
Fault isolation tests 8-3
Defective line drawer 8-3
Defective shelf circuit pack 8-3
Defective line card 8-4
Defective DS-1 link 8-4
Load file mismatch 8-5
Diagnostic tests 8-5
Lines maintenance 8-5
Automatic line testing 8-5
Station tests 8-7
Manual line tests 8-8
Product-specific test tools 8-8
Line maintenance cutover (LMCUT) 8-8
Troubleshooting chart 9-1
Advanced troubleshooting procedures 10-1
Powering up the RLCM-EDC 10-1
Powering down the RLCM-EDC 10-6
Common procedures 10-7
Troubleshooting a loading failure 10-7
Troubleshooting an RTS failure 10-10
Troubleshooting dial tone problems 10-11
RLCM-EDC routine maintenance procedures 11-1
Inspecting spare fuse holders RLCM-EDC 11-2
Testing power converter voltages HIE 11-5
Returning a card for repair or replacement RLCM-EDC 11-8
Testing wrist strap grounding cords RLCM-EDC 11-12
Index 12-1

DMS-100 Family Maintenance Manual ABSK007
vii
About this document
When to use this document
This Remote Line Concentrating Module with Extended Distance Capability
(RLCM-EDC) maintenance reference manual provides: overview, signal-
ing, and hardware information for understanding the RLCM-EDC product
and operation; recovery procedure for returning to service an RLCM-EDC
from a completely out-of-service condition; alarm clearing procedures for
clearing an RLCM-EDC alarm condition at the MAP display terminal; card
replacement procedures for removing and replacing hardware modules in the
RLCM-EDC as part of maintenance, verification, or acceptance procedures;
trouble locating and clearing information for locating and clearing problems
beyond the scope of other maintenance procedures; routine maintenance
procedures for performing scheduled routine and preventive maintenance
tasks. The information in this maintenance manual is intended for operating
company personnel engaged in RLCM-EDC maintenance.
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 in the 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.
This document is written for all DMS-100 Family offices. More than one
version of this document may exist. To determine whether you have the
latest version of this document and how documentation for your product is

viii About this document
297-8381-550 Standard 02.02 April 1999
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:
•PAlarm Clearing Procedures
•PCard Replacement Procedures
•POperational Measurements Reference Manual
•PInput/Output System Reference Manual, 297-1001-129
•PTranslations Guide
•PProvisioning Guide, PLN–8991–104
What precautionary messages mean
The types of precautionary messages used in NT documents include
attention boxes and danger, warning, and caution messages.
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
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 Possibility of personal injury
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.

About this document ix
DMS-100 Family Maintenance Manual ABSK007
WARNING Possibility of equipment damage
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.
CAUTION Possibility of service interruption or degradation
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.
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.

x About this document
297-8381-550 Standard 02.02 April 1999
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.
The following excerpt from a procedure shows the command syntax used in
this document:
Manually busy the CTRL on the inactive plane by typing
>BSY CTRL ctrl_no
and pressing the Enter key.
where
ctrl_no is the number of the CTRL (0 or 1)
Example of a MAP response :
FP 3 Busy CTRL 0: Command request has been submitted.
FP 3 Busy CTRL 0: Command passed.
1

DMS-100 Family Maintenance Manual ABSK007
1-1
Maintenance overview
IntroductionThe Remote Line Concentrating Module with Extended Distance Capability
(RLCM-EDC) is a remote peripheral that provides extended geographic
coverage for the Digital Multiplex System-100 (DMS-100) switch. The
RLCM-EDC is configured to operate at a distance of 1,500 to 2,000 miles
from the host office with a maximum engineered one-way path delay of up
to 20 milliseconds.
The RLCM-EDC contains hardware and software maintenance components
that perform routine audits and identify malfunctions in the following:
•RLCM-EDC
•DS-1 links that connect the RLCM-EDC to the host controller
•subscriber lines
Functional overview
The RLCM-EDC provides an interface for two to six DS-1 links from a Line
Trunk Controller PLUS (peripheral life upgrade strategy, LTC+) and, in a
non-blocking configuration, up to 140 electronic business sets (EBS)
connected locally. Refer to PLN-8991-104 for NT6X21 EBS provisioning
information.
The host LTC+ is modified with an NTMX76BA card replacing the
NT6X69 messaging card. The NTMX76BA is a new messaging card that
supports High-level Data Link Control (HDLC), International
Telecommunication Union-T Link Access Protocol on D channel ( ITU-T
Q.921 LAPD) to the RLCM-EDC, which is provisioned with the new
NT6X51BA LCM processor card. The LTC+ and RLCM-EDC are
provisioned with NT6X50AB DS-1 interface cards to support the extended
super frame (ESF) transmission format. The DS-1 channels are configured
for clear channel 64 kilobits per second (64 kbit/s) service using the bipolar
8-bit zero substitution (B8ZS) channel coding method. Refer to figure
“RLCM-EDC to LTC+ hardware configuration” for a view of the modified
peripherals.

1-2 Maintenance overview
297-8381-550 Standard 02.02 April 1999
RLCM-EDC to LTC+ hardware configuration
NT6X50AB
NT6X50AB
NT6X51BA
NTMX76BA
Network
LTC +
RLCM-EDC
NT6X21
EBS
2 to 6 DS-1 Links
DS30/DS512 Speech links
CC
DS30/DS512 Message links
RMM
NTMX77AA
2-wire line
2 DS30A Links
Hardware description
This section describes how the different hardware components of the
RLCM-EDC interact for maintenance and troubleshooting. The following
paragraphs describe the hardware necessary for the RLCM-EDC,
NTX146AA feature package.
General configuration
The RLCM-EDC is housed in an NTNX14AA remote line controller cabinet
(RLCC). The RLCC contains the following main components:
•dual-shelf line concentrating module (LCM)
•single-shelf remote maintenance module (RMM)
•host interface equipment (HIE) shelf

Maintenance overview 1-3
DMS-100 Family Maintenance Manual ABSK007
•frame supervisory panel (FSP)
The lower part of the cabinet contains the LCM, consisting of two line
concentrating arrays (LCA). The upper part of the RLCC cabinet contains
the HIE shelf, the RMM shelf, and the FSP. The FSP provides power
control and alarm circuits for the LCM, HIE, and RMM shelves. Refer to
figure “RLCC cabinet, shelf, and panel arrangement” for the layout of the
RLCC equipment cabinet.
Line concentrating module
The LCM occupies shelf positions 05 and 19 of the RLCC cabinet. The dual
unit LCM contains two LCA shelves. LCA-0 is always the bottom array or
shelf and LCA-1 is the top array of the LCM.
Each LCA shelf is equipped with the new processor pack (NT6X51BA),
digroup controller card (DCC), power converter, and five line drawers.
Each line drawer connects up to 64 line card slots. The 64 line card slots are
divided into two groups of 32. Each group of 32 line card slots is called a
line subgroup (LSG).
The 10 line drawers and the 20 LSGs in the 2 LCA shelves are identified in
the following figure “RLCC cabinet, shelf, and panel arrangement.”

1-4 Maintenance overview
297-8381-550 Standard 02.02 April 1999
RLCC cabinet, shelf, and panel arrangement
Remote maintenance module
Host interface equipment
LSG 11 LSG 13 LSG 15 LSG 17 LSG 19
LSG 10 LSG 12 LSG 14 LSG 16 LSG 18
5 6 7 8 9
LSG 01 LSG 03 LSG 05 LSG 07 LSG 09
LSG 00 LSG 02 LSG 04 LSG 06 LSG 08
0 1 2 3 4
LCM
LCA 1
LCA 0
60
47
33
19
05
Shelf
position
RLCC cabinet (NTNX14AA)
FSP (NTNX26AA)
Cooling unit
END
GND
RMM (NT6X13AA)
HIE (NT6X11AA)
Frame Supervisory
Panel
(NTNX27AA)
(NT6X04AA)

Maintenance overview 1-5
DMS-100 Family Maintenance Manual ABSK007
In the RLCC, the LCM connects two to six DS-1 control-side (C-side) links
to its 20 line sub-groups (LSG). The following LCM components make up
this interface:
•2 power converters
•2 control complexes (LCM processor and digroup control card)
•20 LSGs
The RLCM-EDC has a minimum of two DS-1 links because each primary
link carries one message channel to the LTC+ for the LCM unit and one for
the RMM. Each DS-1 link carries 24 speech channels, making possible 48
to 144 available channels. Four of these channels, are always nailed up for
messaging to the host controller. Other links, up to a total of six, may be
accommodated depending on traffic capacity and the concentration ratio
required.
New LCM processor NT6X51BA has hardware and software capability to
implement the HDLC LAP-D messaging protocol required in the extended
distance capability to the controlling LTC+. The LCM processor cards are a
multi-processor design that partitions the real-time critical work in the
peripheral to allow higher call completion rates than the standard RLCM
product.
LCA shelf configuration
The layout of the LCA shelves and line drawers of the RLCM-EDC are
shown in the following figure “Line concentrating array (LCA) shelf
layout.”
An LCA shelf contains the following parts:
•one power converter
•one control complex
•five line drawers
Power converter card
The power converter card (NT6X53), located in slots 01–03 of the LCA,
contains circuits for converting –48V office battery to regulated +5V and
+15V outputs for the shelf circuitry.
Power connections to the two shelves of an LCM are arranged so that one
converter can supply power to both shelves if the mate converter fails.

1-6 Maintenance overview
297-8381-550 Standard 02.02 April 1999
Line concentrating array (LCA) shelf layout
Power
converter
L
C
M
P
D
C
CLSG
LSG
LSG
LSG
LSG
LSG
LSG
LSG
Odd
LSG
LSG
Even
LCA: NT6X04AA
01 02 03 04 05Slot:
Line drawers
01–03 6X53AA Power converter. Also contains ringing
and ANI voltage switching circuits.
04 LCMP 6X51BA LCM processor card (see note)
05 DCC 6X52AA Digroup control card
– – 6X05AA Line drawer
– LSG – Line subgroup
Note: The NT6X51BA processor card contains two banks of flash ROM memory, 4M in
each bank
EvenEvenEvenEven
Odd Odd Odd Odd
Slot Abbr NT PEC Remarks

Maintenance overview 1-7
DMS-100 Family Maintenance Manual ABSK007
LCM control complex cards
The LCM processor (LCMP) card and di-group control card (DCC) are
often referred to as common cards in the LCA. In each LCA, the common
cards, which are always provided. The following paragraphs describe the
functions of these cards.
LCM processor card
The LCMP, NT6X51BA, located in slot 04 of each LCA shelf, has three
Motorola 68302 processors running at 16.67 megahertz (MHz) each and
additional resources, which are tightly coupled. The tasks required of the
LCM processor pack are distributed among the different processors. The
following figure, “NT6X51BA functional block diagram,” shows the
following processors and their resources:
•main processor (MP)
•control side (C-side) processor (CP)
•peripheral side (P-side) processor (PP)
•miscellaneous hardware resources
•faceplate hardware resources
MP circuit resources The main processor is the controlling processor for
the NT6X51BA card. Under normal operating conditions, it directly
controls the LCMP activity signals, DCC timeswitch and connection
memories, operation of the inter-unit communication (IUC) serial link to the
mate processor, and for interfacing the debug monitor serial port. The
non-volatile flash ROM space holds all executable code for the MP and reset
code for the CP and PP processors. Two banks of flash ROM of 4
megabytes (4M) each are provided so the MP can actively execute code
from one bank while updating the code space in the mate or standby (STBY)
bank. Switch of activity between the two banks is implemented using a
deterministic protocol implemented in hardware and software. The MP is
the first processor released for operation after hardware reset and is
responsible for configuring the other two processors (CP and PP) before
releasing them to run. Each processor runs asynchronously and
independently of the other two processors for maximum computing
efficiency.
When a new software load is sent to the RLCM-EDC processor by the
computing module (CM) the RLCM-EDC unit can remain in-service (InSv),
executing code from the active bank, while the new load is being written
into the STBY bank.

1-8 Maintenance overview
297-8381-550 Standard 02.02 April 1999
The NT6X51BA card contains two banks of FLASH ROM memory. Each
bank can hold up to 4M of software and data. The NT6X51BA also
contains a 2M bank of DRAM (Dynamic RAM). FLASH ROM devices can
be reprogrammed multiple times. The two banks of FLASH ROM are
configured so that only one FLASH ROM bank is active at any one time.
An electrically erasable potentiometer (EEPOT) determines which bank is
active. The logic on the board does not allow the active bank to be erased or
reprogrammed. Only the standby bank can be erased and reprogrammed.
This allows the RLCM-EDC to be downloaded while in service. As seen in
the following diagram
NT6X51BA processor configuration
4M Active
Flash 4M Standby Flash
EEPOT
2M DRAM
Debug
port IUC link
Dual-port
RAM
Main processor
P-side processor
C-side processor
256k SRAM 256k SRAM
Serial link BIC
and
LC
CM
Dual-port
RAM
CP circuit resources The CP transfers message packets from the DMS host
carried by C-side message links to the MP. The CP uses the HDLC (LAPD
Q.921) protocol for the C-side message channel. Bus accesses into the DCC
are arbitrated between the MP and CP processors since there is only one
processor bus interface implemented on the NT6X52 DCC pack.
PP circuit resources The PP transfers message packets from line drawer
bus interface card (BIC) circuits across receiver control (RCON) and
transmit control (TCON) serial message links.
Miscellaneous hardware resources The NT6X51BA card contains the
following miscellaneous hardware functions that are not part of any
processor circuit:
•power rail input circuit