Nortel Networks 311 User Manual
Physical description
925
LED
State
Definition
On (Green)
The NTAK79 2 MB PRI circuit card is in an active state.
ACT
Off
The NTAK79 2 MB PRI is in a disabled state. The OOS
LED turns red.
LED turns 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).
RED
Off
No red (local) alarm.
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).
YEL
Off
No yellow (remote) alarm.
On (Green)
2 MB PRI is in loop-back mode.
LBK
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.
On (Red)
DCH is switched on and disabled.
On (Green)
DCH is switched on and enabled, but not necessarily
established.
established.
DCH
Off
DCH is switched off.
The NTAK79 uses a standard IPE-sized (9.5" by 12.5"), multilayer printed
circuit board. The faceplate is 7/8" wide and contains seven LEDs.
circuit board. The faceplate is 7/8" wide and contains seven LEDs.
In general, the LEDs operate as shown in
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.