Maintenance-Object Repair Procedures
555-233-143
8-1596 Issue 1 May 2002
Figure 8-97. Carrier Rewiring Example — Rear View of 5-Carrier Cabinet
After cabling changes are made and verified, power must be restored to the EPN.
Circuit packs in carriers outside the shortened bus are not inserted. As a result,
these circuit packs are alarmed. Ignore these alarms for now. Every alarm should
be resolved when the cabinet is restored to its original configuration.
Procedure 4 is organized into two parts. Part 1 attempts to clear a TDM-bus fault
by replacing every bus cable and terminator within an EPN. Part 2 attempts to
isolate the fault to a particular carrier by extending the TDM bus from the control
carrier to additional carriers one at a time.
!
WARNING:
Power must be removed from the entire EPN before any cables or
terminators are removed. Failure to follow this procedure can cause
damage to circuit packs and power supplies, and can be hazardous to the
technician.
A and B
Include
Extended to
Shortened Bus
(Control Carrier)
to Carrier A Only
Bus Shortened
. . . . . . . . . . . . . .
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. . . . . . . . . . .
TDM/LAN Bus Cable TDM/LAN Bus Terminator
Cabinet
Configured
Normally
Carrier E
Carrier D
Fans
Carrier A
Carrier B
Carrier C
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