Nortel Circuit Card 311 Reference page 927

of the Primary Rate interface (PRI). The remaining two LEDs are associated
with the on-board Clock Controller and the on-board D-channel interface
(DCHI). The LEDs are described in
Table 378
NTAK79 LEDs
LED State
On (Red)
OOS
Off
ACT On (Green)
Off
RED On (Red)
Off
YEL On (Yellow)
Off
LBK On (Green)
Off
CC On (Red)
On (Green)
Flashing (Green)
On (Red)
DCH
On (Green)
Off
Copyright © 2003-2008, Nortel Networks
.
Definition
The NTAK79 2MB PRI circuit card is disabled or
out-of-service.
The NTAK79 2MB PRI is not in a disabled state.
The NTAK79 2MB PRI circuit card is in an active state.
The NTAK79 2MB PRI is in a disabled state. The OOS
LED turns 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).
No red (local) alarm.
A yellow alarm state has been detected. This represents a
remote alarm indication from the far end. The alarm can be
either Alarm Indication (AIS) or Remote Alarm (RAI).
No yellow (remote) alarm.
2 MB PRI is in loop-back mode.
2 MB PRI is not in loop-back mode.
The clock controller is switched on and has been disabled
by the software.
The clock controller is switched on and is either locked to a
reference or in free run mode.
The clock controller is switched on and attempting to lock
on to a reference (tracking mode). 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.
DCH is switched on and disabled.
DCH is switched on and enabled, but not necessarily
established.
DCH is switched off.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Physical description 927
Table 377 "NTAK79 LEDs" (page 926).