Nortel Communication Server 1000E Maintenance Manual page 51

associated with the optional daughterboards. The first of these LEDs
indicates the status of the NTAK20 Clock Controller daughterboard. The
second LED indicates the status of the D-channel interface.
Table 13 "NTAK09/NTRB21 LEDs" (page
on the NTAK09/NTRB21 DTI/PRI/DCH circuit cards. Only one of the five
LEDs is on at one time.
Table 13
NTAK09/NTRB21 LEDs
Affected
circuit card LED
NTAK09 DIS
or
NTRB21
ACT
RED
YEL
LBK
DCH
NTAK20 CC
State Definition
On (Red) The circuit card is disabled.
Off The circuit card is not in disabled state.
On (Green) The circuit card is in active state. No alarm
states exist, the card is not disabled, nor is it in a
loopback state.
Off An alarm state or loopback state exists, or the
card is disabled. See other faceplate LEDs for
additional information.
On (Red) A red-alarm state is detected.
Off No red alarm.
On (Yellow) A yellow-alarm state is detected.
Off No yellow alarm.
On (Green) The card is in loopback mode.
Off The card is not in loopback mode.
On (Red) The D-channel is equipped and disabled.
On (Green) The D-channel is equipped and enabled.
Off The D-channel is not equipped.
On (Red) The NTAK20 is equipped and disabled.
On (Green) The NTAK20 is equipped and is either locked to a
reference or is in free-run mode.
Flashing The NTAK20 is equipped and is attempting to lock
(Green) (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, this state is acceptable, and the
flashing is identifies jitter on the reference.
Off The NTAK20 is not equipped.
Nortel Communication Server 1000
Communication Server 1000E Maintenance
NN43041-700 04.01 4 June 2010
Copyright © 2004-2010 Nortel Networks. All Rights Reserved.
Circuit card features 51
51)describes the LEDs found