DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123 Issue 1
April 1997
Packet Bus Fault Isolation and Correction
Page9-29Packet Bus Fault Correction
9
!WARNING:
If this is a High or Critical Reliability syst em, a nd if the s lot is in the
Active control carrier, perform an SPE interchange before changing
the circuit pack. Follow the procedures presented in Chapter 6,
‘‘Reliability Systems: A Maintenance Aid’’.
■If the backplane pins are not bent, reinsert the circuit pack(s), and
perform Procedure 2 for the next set of circuit packs.
4. If the Packet Bus fault is not present, do the following:
■Reinsert a circuit pack. If multiple circuit packs have been
removed, reinsert the circuit packs one at a time, and repeat the
following substeps until all of the circuit packs have been
reinserted.
■Determine if the Packet Bus fault has returned.
■If the Packet Bus fault has returned, the reinserted circuit pack is
defective. Replace the circuit pack and then continue.
■If the Packet Bus fault does not return when all of the circuit packs
have been reinserted, the procedure is completed.
Continue with Procedure 3 if all the port circuit packs have been checked, but
the Packet Bus fault is still not resolved.
Procedure 3
Procedure 3 removes and reinserts control carrier circuit packs one at a t ime.
The Packet Control, Tone-Clock, and Expansion Interface circuit packs are the
only processor complex circuit packs that communicate on t he Packet Bus. In
addition, the Memory 1 and EPN Maintenance Board circuit packs are
connected to the Packet Bus in the backplane (while the Memory 2 circuit pack is
not). Therefore, these are the only processor complex circuit packs that are likely
to cause a Packet Bus problem in a stable system. As a result, Procedure 3
should be performed only on the Packet Control, Memory 1, and EPN
Maintenance Board circuit packs in all systems, and on the Expansion Interface
and Tone-Clock circuit packs in High and Critical Reliability systems.
!CAUTION:
If the TN771 Standalone mode does NOT indicate Packet Bus faults,
perform Procedure 3 for ONLY the Packet Control, Expansion Interface,
and Tone-Clock circuit packs. Also, problems with the backplane pins need
not be checked for. Determining if the problem is resolved by removing
circuit packs is sufficient.
In a system without High or Critical Reliability
, do the following: