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972 NTBK50 2.0 Mb PRI card
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 LD 60. If the CC is tracking this can
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.
Power requirements
The NTBK50 obtains its power from the backplane, drawing up to 2 A on +5
V, 35 mA on +15 V and 20 mA on –15 V.
The NTBK50 obtains its power from the backplane, drawing maximums of 2
amps on +5 V, 35 mA on +15 V and 20 mA on -15 V.
The NTBK50 obtains its power from the backplane, drawing up to 2 A on +5
V, 35 mA on +15 V and 20 mA on –15 V.
Environment
The NTBK50 meets all applicable Nortel operating specifications.
The NTBK50 meets all applicable Nortel Networks operating specifications.
The NTBK50 meets all applicable Nortel Networks operating specifications.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.