Nortel Enterprise 1000 Reference Manual page 170

Page 170 of 236
Table 41
NTAK79 LEDs (Part 2 of 2) (Continued)
LED
LBK
CC
DCH
553-3023-211 Standard 1.00 June 2001
NTAK79 2.0 Mb PRI card
State
On (Green)
Off
On (Red)
On (Green)
Flashing (Green)
On (Red)
On (Green)
Off
Definition
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 is 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
may 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.