Nortel Networks 311 User Manual
970
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).
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).
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.
is in free run mode.
Flashing
(Green)
(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.
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.
The NTBK50 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
.
Table 403
NTBK50 faceplate LEDs
NTBK50 faceplate LEDs
LED
State
Definition
OOS
On (Red)
The NTBK50 2.0 Mb PRI circuit card is either disabled or
out-of-service. Also, the state of the card after power-up, completion
of self test, and exiting remote loopback.
out-of-service. Also, the state of the card after power-up, completion
of self test, and exiting remote loopback.
Off
The NTBK50 2.0 Mb PRI is not in a disabled state.
ACT
On (Green)
The NTBK50 2.0 Mb PRI circuit card is in an active state.
Off
The NTBK50 2.0 Mb PRI is in a disabled state. The OOS LED is red.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.