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 ci rcuit packs have b een reinserted.
b. Determine if the packet b us fault has returned.
c. If the packet b us fault has returned, the reinserted c ircuit pack is
defective. Replace the c ircuit pack and then continue.
d. If the packet b us fault does not return when all of the circ uit packs
have been reinserted, you are finished .
Continue with Procedure 3 if all the port c ircuit packs have b een checked, b ut
the packet bus fault is sti ll not resolved.
Procedure 3
Proce dure 3 remov es an d rei nsert s SPE and EPN co ntrol circ uit p ack s one at a
time. In the PPN, the foll owing SPE cir cuit pac ks ei ther u se the pac ket b us or are
connected to it in the b ackplane wiring:
■TN1655 Packet Interface
■TN768/TN780 Tone/Clock
■UN332 MSSNE T
In the EPN, the following control circuit p acks either use the packet b us for
communication or are connec ted to it in the bac kplane 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 p roblem in a stable system. Perform this p rocedure on only these
circuit packs.
If the TN771D Standalone mode does
not
indicate pac ket bus faults, perform
Procedure 3 for
only
the Packet Interface and Tone/Clock circ uit packs and d o
not check for prob lems with the backplane p ins. Determining if the prob lem is
resolved by removing c ircuit packs is suffic ient.
For a system with simplex SPE:
1. Power down the control carrier. Refer to ‘‘Replacing SPE Circuit Packs’’.
2. Remove the suspect circuit p ack.
3. Determine if the backpl ane pins in the removed circ uit pack’s slot are
bent.
4. If the backplane p ins are bent:
a. Straighten or replace the pins.