DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-87Packet Bus Fault Isolation and Repair
5
■ A packet bus Uncorrectable report is sent from the Maintenance/Test
packet bus port (M/T-PKT).
When such a failure occurs, a PKT-BUS error is logged. Refer to the PKT-BUS
section in Chapter 9 for more detailed information.
Fault Correction Procedures: Overview
This section gives an overview of the procedures used to isolate the cause of and
correct packet bus faults. Details are presented in following sections.
1. Procedure 1 attempts to determine if 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 port network to attempt
to isolate a faulty carrier.
The Maintenance/Test Circuit Pack (TN771)
The TN771 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)
The PPN always contains a TN771D. 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 the ‘‘ISDN-PLK (ISDN-PRI Signaling
Link Port)’’ section in Chapter 9, ‘‘Maintenance Object Repair Procedures’’.
The Digital Port Testing functions are discussed in the ‘‘DIG-LINE (Digital Line)’’
,
"DAT-LINE (Data Line Port)", ‘‘PDMODULE (Processor Data Module) TDMODULE
(Trunk Data Module)’’, ‘‘TDMODULE (Trunk Data Module)’’, ‘‘PGATE-PT (Packet
Gateway Port)’’, ‘‘PDATA-PT (Packet Data Line Port)’’, and ‘‘MODEM-PT
(Modem Pool Port)’’, sections in Chapter 9, ‘‘Maintenance Object Repair
Procedures’’.
