DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-105Packet Bus Fault Isolation and Repair
5
4. If the packet bus fault is not present:
a. Reinsert circuit packs one at a time and repeat the following
substeps until all circuit packs have been reinserted.
b. Determine if the packet bus fault has returned.
c. If the packet bus fault has returned, the reinserted circuit pack is
defective. Replace the circuit pack and then continue.
d. If the packet bus fault does not return when all of the circuit packs
have been reinserted, you are finished.
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 SPE and EPN control circuit packs one at a
time. In the PPN, the following SPE circuit packs either use the packet bus or are
connected to it in the backplane wiring:
■ TN1655 Packet Interface
■ TN768/TN780 Tone/Clock
■ UN332 MSSNET
In the EPN, the following control circuit packs either use the packet bus for
communication or are connected to it in the backplane wiring:
■ TN775 EPN Maintenance Board
■ TN768/TN780 Tone/Clock
These are the only SPE and EPN control circuit packs that are likely to cause a
packet bus problem in a stable system. Perform this procedure on only these
circuit packs.
If the TN771D Standalone mode does
not
indicate packet bus faults, perform
Procedure 3 for
only
the Packet Interface and Tone/Clock circuit packs and do
not check for problems with the backplane pins. Determining if the problem is
resolved by removing circuit packs is sufficient.
For a system with simplex SPE:
1. Power down the control carrier. Refer to ‘‘Replacing SPE Circuit Packs’’.
2. Remove the suspect circuit pack.
3. Determine if the backplane pins in the removed circuit pack’s slot are
bent.
4. If the backplane pins are bent:
a. Straighten or replace the pins.
