Avaya S8700 Maintenance Manual page 418

Maintenance Object Repair Procedure
. . . . . . . . . . . . . .
Carrier C
. . . .
Carrier B
. . . . . . . . . . . . . . . .
Carrier A
Fans
. . . .
Carrier D
. . . . . . . . . . . . . .
Carrier E
Configured
(All 5 Carriers
Figure 8-49. Carrier Rewiring Example
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.
8-1114 Issue 1 May 2002
TDM/LAN Bus Terminator
. . . . . . . . . . . .
. . . . . . . . . . . .
Normally
Cabinet
TDM/LAN Bus Cable
. . . . . . . . . . .
Bus Shortened
to Carrier A Only
(Control Carrier)
—
Rear View of 5-Carrier Cabinet
. . . . . . . . . . . . . .
. . . . . . . . . . . . . .
Shortened Bus
Extended to
Include
A and B
555-233-142