Nortel Meridian Meridian 1 User manual

Meridian 1 Fault clearing
Meridian 1
Meridian 1
Fault clearing
Document Number: 553-3001-510
Document Release: Standard 11.00
Date: June 1999
Year Publish FCC TM
© 1993, 1999
All rights reserved
Printed in the United States of America
Information is subject to change without notice. Nortel Networks Corporation 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 Industry Canada. 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 instruction 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 their own expense.
SL-1 and Meridian 1 are trademarks of Nortel Networks Corporation.

iii
Meridian 1 Fault clearing
Revision history
January 29, 1990 Standard, release 1.0.
February 28, 1990 Standard, release 2.0.
December 1,1991 Standard, release 3.0. This document was reissued to include technical
content updates.
December 31, 1992 Standard, release 4.0. This document was reissued to include hardware
required for X11 release 18 (option 81 is not included in this release).
April 1, 1994 Standard, release 5.0. This document was reissued to include information on
Meridian 1 options 61C and 81.
December 1994 Standard, release 6.0.This document is reissued toinclude information on the
Small systems Multi-Disk Unit (SMDU) and Meridian 1 option 51C.
Changes to technical content are noted by revision bars in the margins.
July 1995 Standard,release7.00.Thisdocumentisreissued toinclude informationfrom
the international NTP to make a global NTP, Meridian 1 option 81C, and
minor text edits. Changes are noted by revision bars in the margins.
December 1995 Standard, release 8.00. This document is reissued to include information on
NT9D19 Call Processor Card.

iv
553-3001-510 Standard 11.00 June 1999
August 1996 Standard, release 9.00. This document is reissued for text edits. Due to the
extent of the changes, revision bars are not used.
October 1997 Standard, release 10.00. This document is reissued to include information on
the NT5D61 Input/Output Disk Unit with CD-ROM (IODU/C) card.
June 1999 Standard, release 11.00. This document is reissued for text edits.

v
Meridian 1 Fault clearing
Contents
About this document . . . . . . . . . . . . . . . . . . . . . . . 1
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
How to clear faults . . . . . . . . . . . . . . . . . . . . . . . . . 3
Fault clearing process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Using this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Fault indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
System messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Visual fault indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Maintenance display codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
User reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Accessing the system . . . . . . . . . . . . . . . . . . . . . . . 13
Access through the system terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Access through the maintenance telephone . . . . . . . . . . . . . . . . . . . . . 15
Clearing power faults . . . . . . . . . . . . . . . . . . . . . . . 19
Power faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Fault clearing procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Main circuit breaker and all LEDs off (option 21A) . . . . . . . . . . . . . . 27
Main circuit breaker on but all LEDs off (option 21A) . . . . . . . . . . . . 28
Green LED off on module power supply (option 21A) . . . . . . . . . . . . 29
Circuit breakers and all column LEDs off (DC power) . . . . . . . . . . . . 30
Circuit breakers on but all column LEDs off (DC power) . . . . . . . . . . 32

vi Contents
553-3001-510 Standard 11.00 June 1999
Green LED off on module power supply (DC power) . . . . . . . . . . . . 33
Defective blower unit indicated (DC power) . . . . . . . . . . . . . . . . . . . . 35
Main circuit breaker and all column LEDs off (AC power) . . . . . . . . 36
Main circuit breaker on but all column LEDs off (AC power) . . . . . . 38
Breaker off on MPDU (AC power) . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Green LED off on module power supply (AC power) . . . . . . . . . . . . 41
Defective blower unit indicated (AC power) . . . . . . . . . . . . . . . . . . . . 43
Clearing common equipment faults . . . . . . . . . . . 45
Common equipment faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Fault clearing procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Call processing stopped (options 21A and 21) . . . . . . . . . . . . . . . . . . 49
Call processing stopped (option 21E) . . . . . . . . . . . . . . . . . . . . . . . . . 51
Fault indicated on memory/peripheral signaling card
(options 21A and 21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Fault indicated on MSPS card (option 21E) . . . . . . . . . . . . . . . . . . . . 55
Fault indicated on the CPU card (options 21A and 21) . . . . . . . . . . . . 56
Fault indicated on the ICM card (option 21E) . . . . . . . . . . . . . . . . . . . 58
Call processing stopped (option 51) . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Fault indicated on memory card (option 51) . . . . . . . . . . . . . . . . . . . . 63
Fault indicated on a common equipment card (option 51) . . . . . . . . . 65
Call processing stopped (options 61 and 71) . . . . . . . . . . . . . . . . . . . . 68
Fault indicated on a memory card (options 61 and 71) . . . . . . . . . . . . 71
Fault indicated on a common equipment card
(options 61 and 71) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Fault indicated on a common equipment card
(options 51C, 61C, 81, and 81C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Floppy disk unit not operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Multi Drive Unit or Small System Multi Drive Unit not operating . . . 82
Core Multi Disk Unit not operating . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
IOP/CMDU not operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Contents vii
Meridian 1 Fault clearing
IODU/C not operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Clearing network equipment faults . . . . . . . . . . . . 93
Network equipment faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Fault clearing procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Disabled loop indicated by OVD message
(NT1P61 Fibre Superloop Network Card) . . . . . . . . . . . . . . . . . . . . . . 97
Disabled loop indicated by OVD message
(NT7R51 Local Carrier Interface Card) . . . . . . . . . . . . . . . . . . . . . . . . 99
Disabled loop indicated by OVD message
(NT8D04 Superloop Network Card) . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Loop disabled without OVD message
(NT8D04 Superloop Network Card) . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Disabled loop indicated by OVD message
(QPC414 Network Card) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Loop disabled without OVD message
(QPC414 Network Card) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Disabled peripheral signaling card indicated by OVD message . . . . . 111
Peripheral signaling card disabled without OVD message . . . . . . . . . 113
Problems with transferring, placing conference calls,
or Music-on-Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Problems placing calls on 2500 telephones and some trunks . . . . . . . 117
Clearing peripheral equipment faults . . . . . . . . . . 119
Peripheral equipment faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Fault clearing procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Red LED lit on Fibre Peripheral Controller card . . . . . . . . . . . . . . . . . 122
Red LED lit on Remote Carrier Interface card . . . . . . . . . . . . . . . . . . 124
Red LED lit on Peripheral Controller card . . . . . . . . . . . . . . . . . . . . . . 126
Red LED lit on dual loop peripheral buffer card . . . . . . . . . . . . . . . . . 128
Disabled peripheral equipment card . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
More than one peripheral equipment card disabled . . . . . . . . . . . . . . . 132

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553-3001-510 Standard 11.00 June 1999
Clearing trunk faults . . . . . . . . . . . . . . . . . . . . . . . . 135
Trunk faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Fault clearing procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Trunk cannot make or receive calls
(OVD message received) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Trunk cannot make or receive calls (no OVD message) . . . . . . . . . . . 142
Clearing attendant console faults . . . . . . . . . . . . . 145
Attendant console faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Fault clearing procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Console cannot make or receive calls (OVD message received) . . . . 148
Console cannot make or receive calls (no OVD message) . . . . . . . . . 150
Indicator or digit display not functioning properly . . . . . . . . . . . . . . . 152
Operator cannot hear or be heard properly . . . . . . . . . . . . . . . . . . . . . 154
Clearing telephone faults . . . . . . . . . . . . . . . . . . . . 157
Telephone faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Fault clearing procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Telephone cannot make or receive calls (OVD message received) . . . 160
Telephone cannot make or receive calls (no OVD message) . . . . . . . 162
One end cannot hear or be heard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Noise or low volume on all calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Defective indicator, digit display, or component . . . . . . . . . . . . . . . . . 168
Defective feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Defective add-on module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Cannot dial from 2500 telephone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
No ring on 500 and 2500 telephones . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Final maintenance procedure . . . . . . . . . . . . . . . . 177
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Contents ix
Meridian 1 Fault clearing
List of terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

xContents
553-3001-510 Standard 11.00 June 1999

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Meridian 1 Fault clearing
List of figures
Figure 1
Power equipment—option 21A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 2
Internal DC power equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 3
Internal AC power equipment (except option 21A) . . . . . . . . . . . . . . . 23
Figure 4
Power equipment designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 5
Option 21A power cabling in rear of column . . . . . . . . . . . . . . . . . . . 29
Figure 6
DC power cabling in rear of column . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 7
Dual circuit breaker and associated module power supplies . . . . . . . . 40
Figure 8
AC power cabling in rear of column . . . . . . . . . . . . . . . . . . . . . . . . . . 42

xii List of figures
553-3001-510 Standard 11.00 June 1999

xiii
Meridian 1 Fault clearing
List of tables
Table 1
Using fault indicators to classify a fault . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 2
System message fault indicators and related fault types (Part 1 of 2) . 6
Table 3
Visual fault indicators and related fault types . . . . . . . . . . . . . . . . . . . 8
Table 4
Maintenance display locations and related fault types . . . . . . . . . . . . . 10
Table 5
User reported problems and related fault types . . . . . . . . . . . . . . . . . . 12
Table 6
Translation from keyboard to telephone dial pad . . . . . . . . . . . . . . . . . 16
Table 7
PWR message fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 8
Power fault indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 9
Common equipment fault indicators . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 10
Network equipment fault indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Table 11
Peripheral equipment fault indicators . . . . . . . . . . . . . . . . . . . . . . . . . 121
Table 12
Trunk fault indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

xiv List of tables
553-3001-510 Standard 11.00 June 1999
Table 13
Attendant console fault indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Table 14
Telephone fault indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Page 1 of 190
Meridian 1 Fault clearing
2
About this document
This document gives instructions for locating and clearing faults. The
procedures in this document are based on the assumption that the Meridian 1
is properly installed (for example, all card locations, option switch settings,
and cable connections are correct) and was fully operational before the fault.
To use this document, you should have a basic knowledge of Meridian 1
operation and maintenance. (Contact Northern Telecom Training Centers for
information on courses.) You should also read and fully understand
Meridian 1 general maintenance information (553-3001-500) before
attempting to clear faults.
This document does not provide procedures for replacing equipment. See
Meridian 1 hardware replacement (553-3001-520) to replace faulty
equipment.
References See the Meridian 1 planning and engineering guide for:
—Meridian 1 system overview (553-3001-100)
—Spares planning (553-3001-153)
—Meridian 1 equipment identification (553-3001-154)

Page 2 of 190 About this document
553-3001-510 Standard 11.00 June 1999
See the Meridian 1 installation and maintenance guide for:
—Meridian 1 system installation procedures (553-3001-210)
—Circuit card installation and testing (553-3001-211)
—Telephone and attendant console installation (553-3001-215)
—Meridian 1 general maintenance information (553-3001-500)
—Meridian 1 hardware replacement (553-3001-520)
See the X11 input/output guide for a description of all administration
programs and maintenance programs, and to the X11 system messages guide
for interpretation of system messages.

Page 3 of 190
Meridian 1 Fault clearing
12
How to clear faults
Fault clearing process
When a fault must be cleared in the Meridian 1, follow these steps:
— Observe and record all fault indicators.
Systemmessages,visual fault indicators,maintenancedisplaycodes,and
user reports identify many problems. If the indicators are not current or
seem incomplete, you may need to print the History File for previous
messages, you may need to initialize the system for information on the
current status, or you may need to do both.
— Look up all maintenance display codes and system messages in the X11
system messages guide.
The interpretationof the message or code may identify faulty equipment
and tell you what action to take to clear the problem. If you cannot clear
the fault through information in either of these guides, follow the process
in this document to isolate and clear the fault(see “Using thisdocument”
on page 4).
— Try to test and enable disabled equipment.
You may be able to hardware reenable circuit cards by unseating them,
then reinstalling them. You may be able to software reenable cards by
disabling them, then reenabling them. When the cause of a fault is not
clearly evident, a software test may help you identify the problem.
— Replace equipment as necessary.
When you identify faulty equipment, follow procedures in Meridian 1
hardware replacement (553-3001-520). When you think the fault is
corrected, follow the instructions in “Final maintenance procedure” on
page 177 to completely restore normal operation.

Page 4 of 190 How to clear faults
553-3001-510 Standard 11.00 June 1999
Using this document
To use the information in this document, follow the steps below:
1Classify the fault by the indicators present (see “Fault indicators” on
page 6). When multiple faults are indicated, clear them in the following
order:
• Power faults
• Common equipment faults
• Network equipment faults
• Peripheral equipment faults
• Trunk faults
• Attendant console faults
• Telephone faults
Note: Always clear possible power faults then common equipment
faults before any other type of fault.
2Go to the chapter for clearing the type of fault identified. There is a
chapter for each type of fault listed above (for example, “Clearing power
faults” on page 19). As closely as possible, match the problem to a
symptom listed at the beginning of the chapter.
3Go throughthe procedure for clearingeach possiblecauseof theproblem
until the fault is cleared.
4When the fault is corrected, follow the instructions in “Final maintenance
procedure” on page 177 to completely restore normal operation.
Procedure 1 is an example of the process described above.

How to clear faults Page 5 of 190
Meridian 1 Fault clearing
Procedure 1
An example of how to use this document
1Classify the fault—The fault indicators are listed in Table 1. They
identify a common equipment fault.
2Go to the chapter for clearing the fault and match the symptom—Go to
“Clearing common equipment faults” on page 45 and you will find
“Fault indicated on memory card” in the table of contents.
3Go through the procedures—Check for a defective memory card. If it
is notdefective, check for another defective common equipment card.
If you find the CPU interface card is defective, you can disregard the
remaining possible causes.
4Go to “Final maintenance procedure” on page 177—Follow the
instructions in each step.
Table 1
Using fault indicators to classify a fault
Fault indicators Type of fault
SYSTEM MESSAGE:
CED013 Common equipment
VISUAL FAULT INDICATOR:
Red LED lit on memory card Common equipment
MAINTENANCE DISPLAY CODE:
Code indicating a fault displayed on CPU
interface card
Common equipment
USER REPORT:
Major alarm reported by attendant Common equipment

Page 6 of 190 How to clear faults
553-3001-510 Standard 11.00 June 1999
Fault indicators
When there is a fault in the system, you may be notified by any combination
of the following indicators:
— system messages
— visual fault indicators
— maintenance display codes
— user reports
Each type of indicator is described below.
System messages
Systemmessagesarecodes witha mnemonic andnumber,suchas PWR0014.
The mnemonic identifies a software program or a type of message. The
number identifies the specific message. Use system messages with other
indicators, such as maintenance display codes and visual indicators, to
identify and clear faults.
Table 2 lists the most common fault indicating messages and the type of fault
they indicate. For a complete list and interpretation of system messages, see
the X11 system messages guide.
Table 2
System message fault indicators and related fault types (Part 1 of 2)
System messages Type of fault
BSD090
PWR messages Power
BSD080, 085, 086, 103
CED messages
CIOD, CMON, and CNI messages
INI001, 002, 004, 005
IOD006, 007, 060, 061, 291–297
NWS030, 102, 103, 142
SYS messages
Common equipment