DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-109Packet Bus Fault Isolation and Repair
5
Processor Port Network:
1. Power down the cabinet and terminate the packet bus so that it extends
only from the carrier that contains the active SPE (A or B) to the carrier that
contains the Maintenance/Test circuit pack.
2. Power up the cabinet, allow the system to reboot, and determine if the
packet bus fault is still present. If not, proceed to the next step.
If there are shorts on the packet bus, perform Procedures 2 and/or 3 for
the circuit packs in the active SPE and carriers connected to it on the
shortened bus. (Procedure 2 is performed for port circuit packs, and
Procedure 3 is performed for SPE circuit packs.)
3. If the packet bus fault is not present, extend the packet bus to another
carrier, and repeat the procedure in the previous step. When the addition
of a carrier causes the fault to recur, and if there are shorts, perform
Procedure 2 and/or Procedure 3 for only the circuit packs in that carrier.
4. If the packet bus fault recurs when the packet bus is extended, and if
there are no shorts, or Procedures 2 and 3 do not resolve the problem, the
added carrier(s) that caused the problem to recur are defective and must
be replaced.
Expansion Port Networks:
1. Place the Maintenance/Test circuit pack into a carrier that contains the
active Expansion Interface circuit pack to permit isolation of the failure to
the smallest possible number of carriers.
2. Power down the cabinet and terminate the packet bus on the carrier with
the M/T and active EI.
3. Determine if the packet bus fault is still present If so, and if there are shorts
on the packet bus, perform Procedure 2 and/or Procedure 3 for only the
circuit packs in carriers connected to the ‘‘shortened’’ packet bus.
4. If the packet bus fault is not present, extend the packet bus to another
carrier, and repeat the procedure in the previous step. When a carrier that
causes the fault to recur is added, and if there are shorts, perform
Procedure 2 and/or Procedure 3 for only the circuit packs in that carrier.
5. If the packet bus fault recurs as the packet bus is extended, and if there
are no shorts, or Procedures 2 and 3) do not resolve the problem, the
added carrier(s) that caused the problem to recur are defective and must
be replaced.
