DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-107Packet Bus Fault Isolation and Repair
5
8. Repea t this proc edu re for the ot her SPE or Tone/Clock. If both have
already been chec ked, go to the next step.
9. If all SPE and/or EPN control circuit pac ks have been chec ked and the
problem is not resolved, c ontinue with Procedure 4.
Procedure 4
Procedure 4 is used when the prec eding proced ures fail or when open leads are
present. It is helpful in identifying multiple circuit p ack faults and carrier hard ware
faults. It attempts to isolate the failure to a par ticular set of carriers and c hecks
only the circuit pac ks in those carriers.
In Procedure 4, the TDM/LAN Cable Assemblies and TDM/LAN termination
resistor packs are replaced . If this action does not resolve th e packet bus fault,
the carriers are reconfigured by moving the termination resistor p acks on the
carrier backp lanes in such a manner that certain c arriers are disconnec ted from
the bus. To terminate the packet bus at the end of a p articular carrier, unplug the
cable that connec ts the carrier to the next carrier and replace the cab le with a
TDM/LAN terminator resistor pack (see Figure 5-47). When the length of the
packet bus is mod ified with this proced ure, circuit pac ks that are essential to
system operation (and the TN771D Maintenanc e/Test in standalone mode) must
still be connected to the new ‘shortened’ pac ket and TDM busses.
!DANGER:
Power must be removed from the entire port network b efore any cables or
terminators are removed. Failure to do so can c ause damage to circ uit
packs and p ower supplies, and c an be hazardous to the tech nician.
!DANGER:
Circuit packs in c arriers that are not part of the shortened bus are not
inserted. As a result, these circ uit packs are not alarmed Ig nore alarm
status for these circuit pac ks for now All alarms should b e resolved when
the cabinet is restored to its orig inal configuration.