Alarms, Errors, and Troubleshooting
555-233-143
4-106 Issue 1 May 2002
Procedure 1: Circuit Pack Fault Detection
Procedure 1 determines whether any circuit packs that use the packet bus have
faults. For each circuit pack type in Table 4-8 proceed through the following
steps. Check these circuit packs in the order presented by the flowchart shown
earlier in this discussion — unless newly inserted circuit packs are involved.
Newly added boards are the most likely cause of a problem.
1. Display errors and display alarms for the circuit pack.
2. For any errors or alarms, follow the repair actions recommended in
Chapter 8, ‘‘Maintenance-Object Repair Procedures’’.
3. After following the recommended repair actions, whether they succeed or
fail, determine whether the packet-bus fault is resolved. If so, you are
finished.
4. If the packet-bus fault is still present, apply this procedure to the next circuit
pack.
5. If there are no more circuit packs in the list, go to Procedure 2: Removing
and Reinserting Port Circuit Packs.
Procedure 2: Removing and Reinserting Port
Circuit Packs
Procedure 2 removes and reinserts port circuit packs (purple slots) and the EI
circuit pack one or several at a time. Use Procedure 2 for each port circuit pack in
the EPN until every port circuit pack has been tried or the problem is resolved.
NOTE:
An EI circuit pack should be the last one checked since removing it
disconnects the EPN. To check an active EI in a critical-reliability system
(duplicated PNC), use reset pnc interchange to make it the standby.
Always check the standby’s status before executing an interchange.
NOTE:
A Tone-Clock circuit pack should be the next-to-last one checked. (The
TN771D must be reseated after the Tone-Clock is reinstalled.) Refer to
Procedure 3 on page 4-108 for the TN768, TN780, or TN2182 Tone-Clock
circuit pack in a high- or critical-reliability system.
Table 4-8. Packet Circuit Packs
Circuit Pack Name Code Associated Maintenance Objects
ISDN-BRI TN556 BRI-BD, BRI-PORT, ABRI-PORT, BRI-SET, BRI-DAT, ASAI-ADJ
Maintenance/Test TN771D M/T-BD, M/T-PKT
Universal DS1 TN464F UDS1-BD, ISDN-LNK
Expansion Interface TN570 EXP-INTF
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