Alarms, Errors, and Troubleshooting
555-233-143
4-90 Issue 1 May 2002
Overview of Fault Correction Procedures
This section gives an overview of the procedures used to isolate the cause and to
correct packet bus faults. Details are presented in following sections.
1. Procedure 1 attempts to determine whether a circuit pack that interfaces to
the packet bus is the cause of the packet bus problem. This involves
examination of the error and alarm logs followed by the usual repair
actions.
2. If the packet bus problem persists, remove port circuit packs (those in
purple slots) to look for circuit packs that have failed and/or damaged the
packet bus pins.
3. If the packet bus problem persists, perform the same procedure for control
complex circuit packs.
4. If the problem persists, or if the packet-bus faults are known to have open
leads, replace bus terminators and cables. If this does not resolve the
problem, reconfigure the carrier connectivity of the EPN to attempt to
isolate a faulty carrier.
Maintenance/Test Circuit Pack (TN771D)
The TN771D Maintenance/Test circuit pack provides the following functions:
■ Analog Trunk (ATMS) testing
■ Digital Port Loopback testing
■ ISDN-PRI Trunk testing
■ Packet Bus testing
■ Packet Bus reconfiguration (critical-reliability systems only)
Critical-reliability systems have a TN771D in each EPN. A TN771D is optional in
EPNs of other configurations. The ISDN-PRI trunk testing functions are
discussed in ‘‘ISDN-PLK (ISDN-PRI Signaling Link Port)’’ on page 8-965.
The digital port testing functions are discussed in the following sections in Chapter
8, ‘‘Maintenance-Object Repair Procedures’’:
■ ‘‘DIG-LINE (Digital Line)’’ on page 8-538
■ ‘‘DAT-LINE (Data Line Port)’’ on page 8-489
■ ‘‘PDMODULE (Processor Data Module) TDMODULE (Trunk Data
Module)’’ on page 8-1196
■ ‘‘TDMODULE (Trunk Data Module)’’ on page 8-1619
■ ‘‘MODEM-PT (Modem Pool Port)’’ on page 8-1132
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