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Packet Bus Fault Isolation and Correction

555-233-123

9-34 Issue 4 May 2002

2. 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 those carriers that are connected to the ‘‘shortened’’

Packet Bus. (Procedure 2 is performed for port circuit packs, and

Procedure 3 is performed for processor complex 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 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.

4. If the Packet Bus fault recurs as the Packet Bus is extended, and if

Procedures 2 and 3 (if performed) do not resolve the problem, the added

carrier(s) that caused the problem to recur are defective and must be

replaced.

Other Port Networks:

1. Terminate the Packet Bus so that it extends only from the carrier that

contains the Active Expansion Interface to the nearest carrier that contains

the Maintenance/Test circuit pack. Place the Maintenance/Test circuit pack

into a carrier that contains an Expansion Interface circuit pack in order to

allow the procedure to isolate the failure to the smallest possible number of

carriers.