Fault Detection And Locating; Overlay Programs; Alarm Indications; Fault Locating - Nortel QUAA3 Maintenance Manual

Fault detection and locating

Overlay programs

Alarm indications

Fault locating

Fault clearing procedures

Overlay programs are used to detect most faults in the QCA144 cabinet.
These programs are described in Remote Peripheral Equipment maintenance
procedures (553-2601-500).
RPE related alarms are described in Remote Peripheral Equipment
maintenance procedures (553-2601-500).
alarm indications and causes that are unique to the QCA144 cabinet and are
not necessarily caused by a fault in the RPE.
Table 2 gives a cross-reference of fault indicators and associated fault type.
Some faults may be cleared simply by using
using the appropriate procedure for the type of fault indicated in
The following procedures describe how to clear faults in the cabinet.
— CE/PE breaker trips on QUX19
— AC BRKR breaker trips on –48 V
— PE2, PE3, PE4, or PE5 breaker
— FN fuse operates or LN LED is
QCA144 1.5 MB/S RPE Cabinet Maintenance and equipment replacement
Table 1 of this appendix gives the
Table 1. Others are cleared by
unit—Procedure 1
rectifier—Procedure 2
trips—Procedure 3
extinguished—Procedure 4
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Table 1.