Nortel 1000S Guide

ISDN Primary Rate Interface Maintenance
Nortel Networks Communication Server 1000
Nortel Networks Communication Server 1000 Release 4.0
ISDN Primary Rate Interface
Maintenance
Document Number: 553-3001-517
Document Release: Standard 2.00
Date: September 2004
Year Publish FCC TM
Copyright © 2003–2004 Nortel Networks
All Rights Reserved
Produced in Canada
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.
SL-1, Meridian 1, and Succession are trademarks of Nortel Networks.
Title page

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ISDN Primary Rate Interface Maintenance
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Revision history
September 2004
Standard 2.00. This document is up-issued for Communication Server 1000
Release 4.0.
October 2003
Standard 1.00 This document is a new NTP for Succession 3.0. It was created
to support a restructuring of the Documentation Library, which resulted in the
merging of multiple legacy NTPs. This new document consolidates
information previously contained in the following legacy documents, now
retired:
•ISDN PRI: Maintenance (553-2901-501)
•1.5Mb DTI/PRI Description, Installation and Maintenance
(553-3011-310). Content from 1.5Mb DTI/PRI Description, Installation
and Maintenance (553-3011-310) also appears in ISDN Primary Rate
Interface: Installation and Configuration (553-3001-201).
•2.0Mb DTI/PRI Description, Installation and Maintenance
(553-3011-315 2.0). Content from 2.0Mb DTI/PRI Description,
Installation and Maintenance (553-3011-315 2.0) also appears in ISDN
Primary Rate Interface: Installation and Configuration (553-3001-201).

Page 4 of 210 Revision history
553-3001-517 Standard 2.00 September 2004

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ISDN Primary Rate Interface Maintenance
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Contents
About this document . . . . . . . . . . . . . . . . . . . . . . . 9
Subject .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Applicable systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Intended audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Conventions .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Related information .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
PRI fault clearing . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
PRI Red alarm (local alarm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
PRI Yellow alarm (remote alarm) .. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
PRI problems .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
D-channel problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Quick reference to PRI operations . . . . . . . . . . . . 25
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
PRI commands (LD 60) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
PRI messages .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
DCHI quick reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
D-channel commands (LD 96) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
DCH messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
MSDL commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Maintenance service messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

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553-3001-517 Standard 2.00 September 2004
PRI status check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
PRI startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Network Call Trace .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Primary Rate Interface maintenance . . . . . . . . . . 47
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
PRI commands (LD 60) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
PRI alarm commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
PRI test commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
PRI tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
PRI error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
TN-to-channel number conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Use the error counter .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Replace the PRI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Pulsed E&M DTI2 signaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
D-channel maintenance . . . . . . . . . . . . . . . . . . . . . 73
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
DCH commands (LD 96) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
DCH tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
DCH traffic (LD 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
MSDL local loopback test (NT6D80) . . . . . . . . . . . . . . . . . . . . . . . . . 87
MSDL remote loopback tests (NT6D80) . . . . . . . . . . . . . . . . . . . . . . . 90
Protocol log (PLOG) .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Replace the DCHI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
LD 60 - Loop Maintenance for SYS-12, AXE-10, SWE, SWISSNET,
NUMERIS, EuroISDN, NEAX-61, Asia-Pacific . . . . . . . . . . . . . . . . . 98
Clock controller maintenance . . . . . . . . . . . . . . . . 99
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Clock operation .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Clock controller commands (LD 60) . . . . . . . . . . . . . . . . . . . . . . . . . . 102

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ISDN Primary Rate Interface Maintenance
Replace the clock controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Clock controller cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
ISDN Signaling Link maintenance . . . . . . . . . . . . . 111
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
ISL status formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
ISL startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
ISL recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
1.5 Mb DTI/PRI maintenance . . . . . . . . . . . . . . . . . 117
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Monitor DTI/PRI operation .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
DTI/PRI maintenance tools .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
1.5 Mb ISL maintenance . . . . . . . . . . . . . . . . . . . . . 151
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
ISL maintenance tools .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
2.0 Mb DTI maintenance . . . . . . . . . . . . . . . . . . . . . 159
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Monitor system DTI operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
System DTI maintenance tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
2.0 Mb PRI maintenance . . . . . . . . . . . . . . . . . . . . . 179
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Enable the 2.0 Mb PRI after installation . . . . . . . . . . . . . . . . . . . . . . . . 179
Disable the 2.0 Mb PRI before removal . . . . . . . . . . . . . . . . . . . . . . . . 181
Monitor system PRI operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

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553-3001-517 Standard 2.00 September 2004
System PRI maintenance tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
2.0 Mb ISL maintenance . . . . . . . . . . . . . . . . . . . . . 207
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Overview .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
ISL maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

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ISDN Primary Rate Interface Maintenance
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About this document
This document is a global document. Contact your system supplier or your
Nortel Networks representative to verify that the hardware and software
described are supported in your area.
Subject
This document provides maintenance procedures for ISDN Primary Rate
Interface (PRI) capability on Meridian 1, CS 1000S, and CS 1000M systems.
Note on legacy products and releases
This NTP contains information about systems, components, and features that
are compatible with Nortel Networks Communication Server 1000
Release 4.0 software. For more information on legacy products and releases,
click the Technical Documentation link under Support on the Nortel
Networks home page:
http://www.nortelnetworks.com/
Applicable systems
This document applies to the following systems:
• Communication Server 1000S (CS 1000S)
• Communication Server 1000M Chassis (CS 1000M Chassis)
• Communication Server 1000M Cabinet (CS 1000M Cabinet)
• Communication Server 1000M Half Group (CS 1000M HG)
• Communication Server 1000M Single Group (CS 1000M SG)

Page 10 of 210 About this document
553-3001-517 Standard 2.00 September 2004
• Communication Server 1000M Multi Group (CS 1000M MG)
• Communication Server 1000E (CS 1000E)
• Meridian 1 PBX 11C Chassis (Meridian 1 PBX 11C Chassis)
• Meridian 1 PBX 11C Cabinet (Meridian 1 PBX 11C Cabinet)
• Meridian 1 PBX 51C
• Meridian 1 PBX 61C
• Meridian 1 PBX 61C CP PII
•Meridian1PBX81
• Meridian 1 PBX 81C
• Meridian 1 PBX 81C CP PII
Note: When upgrading software, memory upgrades may be required on
the Signaling Server, the Call Server, or both.
System migration
When particular Meridian 1 systems are upgraded to run CS 1000 Release 4.0
software and configured to include a Signaling Server, they become
CS 1000M systems. Table 1 lists each Meridian 1 system that supports an
upgrade path to a CS 1000M system.
Table 1
Meridian 1 systems to CS 1000M systems (Part 1 of 2)
This Meridian 1 system... Maps to this CS 1000M system
Meridian 1 PBX 11C Chassis CS 1000M Chassis
Meridian 1 PBX 11C Cabinet CS 1000M Cabinet
Meridian 1 PBX 51C CS 1000M Half Group
Meridian 1 PBX 61C CS 1000M Single Group
Meridian 1 PBX 61C CP PII CS 1000M Single Group
Meridian 1 PBX 81 CS 1000M Multi Group

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ISDN Primary Rate Interface Maintenance
For more information, see one or more of the following NTPs:
•Communication Server 1000M and Meridian 1: Small System Upgrade
Procedures (553-3011-258)
•Communication Server 1000M and Meridian 1: Large System Upgrade
Procedures (553-3021-258)
•Communication Server 1000S: Upgrade Procedures (553-3031-258)
Intended audience
This document is intended for individuals responsible for maintaining ISDN
PRI capability on Meridian 1, CS 1000S, and CS 1000M systems.
Conventions
Terminology
In this document, the following systems are referred to generically as
“system”:
• Communication Server 1000S (CS 1000S)
• Communication Server 1000M (CS 1000M)
• Communication Server 1000E (CS 1000E)
•Meridian1
The following systems are referred to generically as “Small System”:
• Communication Server 1000M Chassis (CS 1000M Chassis)
• Communication Server 1000M Cabinet (CS 1000M Cabinet)
Meridian 1 PBX 81C CS 1000M Multi Group
Meridian 1 PBX 81C CP PII CS 1000M Multi Group
Table 1
Meridian 1 systems to CS 1000M systems (Part 2 of 2)
This Meridian 1 system... Maps to this CS 1000M system

Page 12 of 210 About this document
553-3001-517 Standard 2.00 September 2004
• Meridian 1 PBX 11C Chassis (Meridian 1 PBX 11C Chassis)
• Meridian 1 PBX 11C Cabinet (Meridian 1 PBX 11C Cabinet)
The following systems are referred to generically as “Large System”:
• Communication Server 1000M Half Group (CS 1000M HG)
• Communication Server 1000M Single Group (CS 1000M SG)
• Communication Server 1000M Multi Group (CS 1000M MG)
• Meridian 1 PBX 51C
• Meridian 1 PBX 61C
• Meridian 1 PBX 61C CP PII
•Meridian1PBX81
• Meridian 1 PBX 81C
• Meridian 1 PBX 81C CP PII
Related information
This section lists information sources that relate to this document.
NTPs
The following NTPs are referenced in this document:
•Software Input/Output: System Messages (553-3001-411)
•Software Input/Output: Maintenance (553-3001-511)
Online
To access Nortel Networks documentation online, click the
Technical Documentation link under Support on the Nortel Networks
home page:
http://www.nortelnetworks.com/

About this document Page 13 of 210
ISDN Primary Rate Interface Maintenance
CD-ROM
To obtain Nortel Networks documentation on CD-ROM, contact your
Nortel Networks customer representative.

Page 14 of 210 About this document
553-3001-517 Standard 2.00 September 2004

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ISDN Primary Rate Interface Maintenance
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PRI fault clearing
Contents
This section contains information on the following topics:
PRI Red alarm (local alarm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
PRI Yellow alarm (remote alarm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
PRI problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
D-channel problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PRI Red alarm (local alarm)
A PRI local alarm can indicate:
• 1.5 Mb/2.0 Mb digital transmission problems
• a PRI card fault
Under any of these alarm conditions, all 24/30 B-channels are taken out of
service, and:
1The PRI local alarm faceplate LED is lit.
2Calls on the PRI are disconnected automatically.
3All 24/30 B-channels are disabled.
4After a pause of 2.5 seconds, the PRI sends a remote-alarm indication to
the far-end switch.
5The appropriate Digital Trunk Diagnostic (DTA) message is printed, and
a minor alarm is raised on all attendant consoles within the same
customer group.

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System software checks every 0-15 minutes (programmable) to see if a
clock-controller or reference-clock error has occurred.
If the 0-15 minute check finds the PRI in local alarm was a primary clock
source, the software switches the clock controller to the secondary reference.
Channel restoration
When the alarm condition improves, the PRI is restored to service as follows:
1The local alarm is cleared.
2After 11 seconds, the PRI stops sending a remote alarm indication to the
far end.
3The D-channel automatically attempts to re-establish. If this is
successful, the B-channels are placed into the idle state and made
available for calls.
Figure 1 on page 17 shows the progression of the system Red and Yellow
(local and remote) alarm timers.

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Figure 1
PRI alarm timers
Procedure 1
Red alarm status check
1Check PRI status using the following prompts:
LD 60
STAT (loop)
2Check PRI alarm counters using the following prompts:
LD 60
LCNT (loop)
3See Table 2 on page 20 for solutions to possible PRI problems.
End of Procedure
Red alarm (local) detected
Red alarm condition clear
50 ms
Yellow alarm (remote) sent to far end
Yellow alarm clear
Trunks restored
Trunks taken out of service
10.5 s ± 0.5 s
2.5 ± 0.5 s
553-1341
Near end:
Far end:
Trunks restored
Trunks taken out of service
380
-800 ms
35 - 800 ms

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553-3001-517 Standard 2.00 September 2004
PRI Yellow alarm (remote alarm)
A remote alarm on the system indicates the far end is out of service. The fact
that the PRI is receiving the remote-alarm pattern indicates that there is
transmission integrity, but the far end is not ready.
When the PRI receives the remote-alarm signal from the far end, all 24/30
B-channels are disabled.
Channel restoration
When the PRI stops receiving the remote alarm, the channels are placed into
the idle state.
Each time a Yellow alarm is generated, a counter is incremented. When the
Yellow alarm 24-hour threshold (prompt RALM in LD 73) is reached, the
PRI must be restored to service manually.
Procedure 2
Checking Yellow alarm status
1Perform a PRI status check.
2Contact personnel at the far end to determine what action they are taking.
When the Yellow alarm (remote alarm) 24-hour threshold is reached (DTA006
is printed), do the following:
3Contact personnel at the far end to determine what action they are taking.
4When the far-end troubles are cleared, reset the alarm counters and
disable, then enable, the PRI. To do this, use the following commands:
End of Procedure
LD 60
LCNT loop list alarm counters
RCNT loop reset alarm counters
DISL loop disable loop
ENLL loop enable loop

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PRI problems
The PRI can have any of the following problems. Determine the cause of the
problem and follow the recommended actions provided in Table 2 on
page 20.

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553-3001-517 Standard 2.00 September 2004
Table 2
PRI problem solving (Part 1 of 2)
Symptom Action
No connection to far end.
(If the 1.5 Mb/2Mb transmission cable is not
physically connected to the far end,
frame-alignment errors occur.
The channels will be disabled, but the PRI will
be in local-alarm mode.)
Use the Error Counter to verify the
1.5 Mb/2.0 Mb digital transmission directly
from the PRI faceplate (RCV and XMT) to
each connection (cross-connect, repeater,
and other such equipment).
PRI fails self-test. Replace the PRI card.
Far-end problems, usually indicated by a
remote alarm.
Do a PRI status check and contact personnel
at the far end for resolution.
PRI is connected but getting bit-rate or
frame errors.
This can be caused by:
• a bad 1.5 Mb/2Mb transmission cable
connection
• electrical or electromagnetic interference
• carrier problems (for example, defective
repeater)
Use the Error Counter to verify the 1.5
Mb/2Mb digital transmission from the PRI
faceplate (RCV and XMT) to each connection
(cross-connect, repeater, and other such
equipment).
Configuration settings do not match the far
end.
These problems can occur during initial
startup. They may be indicated by:
• DTA 018 Frame-slip out-of-service limit
• DTA 021 Loss-of-frame-alignment for 3
seconds
• DCH 1003 D-channel MDL errors
See that the PRI parameters correlate to the
far-end parameters.