Physical description 971
LED State Definition
RED On (Red) A red alarm state has been detected. This represents a local alarm
state of Loss of Carrier (LOS), Loss of Frame (LFAS) or Loss of CRC
Multiframe (LMAS).
Off No red (local) alarm.
YEL On (Yellow) A yellow alarm state has been detected. This represents a remote
alarm indication from the far end. The alarm may be either Alarm
Indication (AIS) or Remote Alarm (RAI).
Off No yellow (remote) alarm.
LBK On (Green) 2.0 Mb PRI is in loop-back mode.
Off 2.0 Mb PRI is not in loop-back mode
CC On (Red) The clock controller is software disabled
On (Green) The clock controller is enabled and is either locked to a reference or
is in free run mode
Flashing
(Green) NTAK20 is equipped and is attempting to lock (tracking mode) to a
reference. If the LED flashes continuously over an extended period
of time, check the CC STAT in LD60. If the CC is tracking this may
be an acceptable state. Check for slips and related clock controller
error conditions. If none exist, then this state is acceptable, and the
flashing is identifying jitter on the reference.
Off The clock controller is not equipped.
DCH On (Red) DCH is disabled.
On (Green) DCH is enabled, but not necessarily established.
Off DCH is not equipped.
The NTBK50 uses a standard 9.5" by 12.5" multi-layer printed circuitboard. The faceplate is 7/8" wide and contains seven LEDs. The LEDs aredescribed in Table403 "NTBK50 faceplate LEDs" (page 970).
Table404
NTBK50 faceplate LEDs
LED State Definition
OOS On (Red) TheNTBK50 2.0 Mb PRI circuit card is disabled or out-of-service.
Also, the state of the card after power-up, completion of self test, and
exiting remote loopback.
Off TheNTBK50 2.0 Mb PRI is not in a disabled state.
ACT On (Green) The NTBK50 2.0 Mb PRI circuit card is in an active state.
Off TheNTBK50 2.0 Mb PRI is in a disabled state. The OOS LED is red.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23May 2008
Copyright© 2003-2008, Nor tel Networks
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