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Packet Bus Fault Isolation and Correction
555-233-123 9-26 Issue 4 May 2002
!
CAUTION:
Since Packet Bus fault isolation procedures involve removing circuit packs
and possibly disconnecting entire carriers, these procedure have a profound
effect on service. Therefore, if possible, implement these procedures after
hours or during hours of minimum system use.
NOTE:
Each of these procedures contains one or more steps that require a
determination as to whether the Packet Bus problem has been resolved.
Accordingly, several condition checks must be performed. We can present
each such check in the form of a question, as follows:
■
Did the Maintenance/Test circuit pack standalone mode initially indicate the
existence of faulty leads, and are these leads no longer indicated?
■
Have all alarms against the Packet Bus and Packet circuit packs been
resolved?
NOTE:
If all alarms are resolved, issue the clear pkt command. This
command attempts to put the switch back into the service state by
resolving any BRI problems that exist. Refer to
Chapter 8,
‘‘Maintenance Commands and Trouble-Clearing Aids’’ , for more
information.
■
Are all ISDN-BRI stations and data modules as well as any relevant ASAI
adjuncts in service?
Note that if one of these conditions is not yet met, the others need not be
checked.
The following sections discuss the four procedures for correcting Packet Bus
faults.
Procedure 1
Procedure 1 determines if any circuit packs that use the Packet Bus have faults.
For each circuit pack type (see
Table 9-1 on page 9-27 ), perform the following
steps:
NOTE:
The circuit packs need not be checked in the order presented if the flowchart
in this chapter has been followed. However, if newly added circuit packs are
involved, check these packs first, inasmuch as the packs are most likely to
have caused a problem.