Lucent Technologies Release 7 Fault Correction Procedures: Overview, The Maintenance/Test Circuit Pack (TN771)

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 Unc orrectable report is sent from the Mai ntenance/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 d etailed information.
Fault Correction Procedures: Overview
This section gives an overview of the proc edures used to isolate the cause of and
correct packet b us 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 c ause of the packet b us problem. This involves
examination of the Error and Alarm logs followed by the usual repair
actions.
2. If the packet bus p roblem persists, remove port circuit packs (those in
purple slots) to look for circ uit packs that have failed and /or damaged the
packet bus pins.
3. If the packet bus p roblem persists, perfor m the same procedure for
control comple x circuit packs.
4. If the problem persists, or if the p acket bus faults are known to have open
leads, replace b us terminators and cabl es. If this does not resolve the
problem, reconfigure the c arrier connectivity of the por t network to attempt
to isolate a faulty carrier.
The Maintenance/Test Circuit Pack (TN771)
The TN771 Maintenance/Test circuit pack provides the fol lowing functions:
■Analog Trunk (ATMS) Testing
■Digital Port Loopback Testing
■ISDN-PRI Trunk Testing
■Packe t Bus Testi ng
■Packet Bus Reconfiguration (Critical Reliab ility 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 Obj ect Repair Procedures’’.
The Digital Port Testing functions are discussed in the ‘‘DIG-LINE (Digital Line)’’,
"DAT-LINE (Data Line P ort)" , ‘‘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 Obj ect Repair
Procedures’’.