Avaya MCC1 Maintenance Procedures page 270

Packet and serial bus maintenance
S8100 packet bus fault isolation and repair
!
Power must be removed from the entire port network before any cables or terminators are removed.
Failure to do so can cause damage to circuit packs and power supplies and can be hazardous to the
technician. After cabling changes are made and verified, power must be restored to the port
network. Use the TN771 Standalone mode to determine if the Packet Bus fault is resolved.
CAUTION:
Circuit packs in carriers that are not part of the shortened bus are not inserted. As a result,
these circuit packs are not alarmed. Ignore these alarms for now. All alarms should be
resolved when the cabinet is restored to its original configuration.
Figure 79: Carrier rewiring example
TDM/LAN
Cable
Procedure 4 is organized into two parts, as follows:
Part 1
1 Power down the PN (see
2 Replace all of the TDM/LAN cables and both TDM/LAN terminators.
3 Restore power to the PN (see
4 Determine if the packet bus fault is still present.
5 If the fault is present, go to Part 2.
Part 2
Processor Port Network
1 Terminate the Packet Bus so that it extends only from the Active control carrier (that is, the carrier
that contains the Active SPE) to the carrier that contains the Maintenance/Test circuit pack. To
allow this procedure to isolate the failure to the smallest possible number of carriers, place the
Maintenance/Test circuit pack into a carrier that contains a processor complex, if possible.
270
WARNING:
Terminator
Normal Cabinet
(Rear View)
Removing and restoring power
Removing and restoring power
Control Carrier
Modified Cabinet
(Rear View)
on page 391).
on page 391).
Maintenance Procedures
December 2003