Nortel Circuit Card Installation Manual page 747

Table 239
NTAK79 LEDs (Part 2 of 3)
LED
RED
YEL
LBK
CC
State
On (Red)
Off
On (Yellow)
Off
On (Green)
Off
On (Red)
On (Green)
Flashing (Green)
NTAK79 2.0 Mb PRI card
Definition
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.
Circuit Card
Page 747 of 906
Description and Installation