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