Isolating and Repairing Packet-Bus Faults
Issue 1 May 2002
4-111555-233-143
3. Determine whether the packet-bus fault is still present. If so, and if there
are shorts on the packet bus, perform Procedure 2: Removing and
Reinserting Port Circuit Packs and/or Procedure 3: Removing and
Reinserting EPN’s Control Circuit Packs 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: Removing and Reinserting Port Circuit Packs and/or
Procedure 3: Removing and Reinserting EPN’s Control Circuit Packs 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, and 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.
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