Avaya S8700 Maintenance Manual page 238

LED Interpretation
After a circuit pack has been initialized, a red LED should be accompanied by an
alarm in the alarm log. A single fault can sometimes light alarm LEDs on several
circuit packs, as in the following examples.
A TDM bus problem may cause several port circuit packs to display red
LEDs.
An EPN Maintenance circuit pack can prevent an Expansion Interface (EI)
circuit pack from initializing.
Extensive interactions in the Center Stage Switch (CSS) can cause
multiple alarms from single faults in DS1C, SNI and SNC circuit packs and
fiber links.
Tone-Clock problems may cause other circuit packs to report alarms.
Misconnected optical fiber cables may cause several circuit packs to alarm.
Packet-bus faults can cause several port circuit packs to display red LEDs.
If a circuit pack has had at least five minutes to be initialized, and the red LED is lit
without an associated alarm in the alarm log, the circuit pack may not be in
communication with the system. This may also be the case when a circuit pack is
properly administered and present in its slot, but there is an error type 1 logged
against it. To determine whether this is so, proceed as follows:
1. Issue the list configuration board UUCSS command. If the system does
not detect the circuit pack, this command will return:
identifier not assigned or no board.
If the documentation for the associated maintenance object gives no
special instructions for this situation, go to the next step.
2. Check the hardware error log for TONE-BD or TDM-BUS errors. If the
board has a "P" suffix execute the reset board UUCSS command,
otherwise execute the test tdm and test tone-clock commands and use
the appropriate maintenance procedures to resolve any identified faults. If
this does not resolve the problem, go to the next step.
3. Reseat the suspect circuit pack.
!
4. Inspect the backplane connectors for bent pins.
5. If the system seems to be functioning correctly, but the circuit pack in
question will not communicate with the system, replace the circuit pack.
6-6 Issue 1 May 2002
CAUTION:
This procedure can cause a partial or total service outage. Consult
thoroughly the documentation for the associated maintenance object
before proceeding. Observe the precautions and procedures
described above.
555-233-143