LED Interpretation
Issue 5 October 2002
113
555-233-119
Control and Port Circuit Pack Status LEDs
Each circuit pack has three LEDs on the front panel visible at the front of the
carrier. On all circuit packs, except the 650A Power Unit, the LEDs indicate:
1. Red (alarm)
—
If the circuit pack is communicating with the system, the
system has detected a fault in this circuit pack. An on-board alarm for this
circuit pack appears in the Alarm Log.
The circuit pack also lights this LED when either the circuit pack has not yet
initialized communication with the system or when the circuit pack loses
contact with the system and stops functioning (circuit pack is said to be “in
reset”). In these cases, there may not be an alarm in the Alarm Log. To
determine if the red LED is lit because the circuit pack is not in contact with
the system, issue the list configuration board PCSS command, where
PCSS refers to the slot containing this circuit pack. If the system does not
detect the circuit pack, this command returns
Identifier not
assigned
or
no board
.
If the circuit pack has just been inserted, the system may still be initializing
the circuit pack. If, after 5 minutes, the circuit pack still has not initialized
communications with the system, check the MO for any special instructions
(for example, EPN Maintenance circuit pack can stop EXP-INTF circuit
pack from initializing). If the MO does not provide the needed information,
perform the following steps:
■
Check the Error Log for TONE-BD and TDM-BUS errors. Enter test
tdm P where P is the port network containing the relevant slot. See
‘‘Restarting Nonfunctioning Port Circuit Packs’’ on page 1659
. Enter
test tone-clock PC, where P is the network containing the relevant
slot, and C is the carrier containing the relevant slot. Follow
appropriate sections for any TONE-BD and TDM-BUS errors.
■
Reseat the suspect circuit pack.
!
WARNING:
Reseating some circuit packs may be very destructive (for example,
Control Carrier circuit packs.)
Wait 5 minutes. Then issue the list configuration board PCSS
command. If the result indicates that the system still has not
registered the circuit pack, go to next step.
■
Try to insert the circuit pack into a different slot and try to insert a
different circuit pack into the suspect slot (provided the maintenance
documentation for this circuit pack does not warn against either of
these actions).
■
If the system seems to be functioning correctly, but the circuit pack
does not start communicating with the system, replace the circuit
pack.