Ntbk50 Faceplate Leds - Nortel 1000E Maintenance Manual

Table 3
NTAK79 LEDs (Part 2 of 2)
LED
LBK
CC
DCH

NTBK50 Faceplate LEDs

State
On (Green)
Off
On (Red)
On (Green)
Flashing (Green)
Off
On (Red)
On (Green)
Off
The NTBK50 circuit card has a total of seven faceplate LEDs. Five of the
LEDs are directly associated with the operation of the PRI. The remaining
two LEDs are associated with the Clock Controller and DCHI/DDCH
daughterboard.
Hardware maintenance tools
Definition
The NTAK79 2 Mbit PRI is in loopback mode.
The NTAK79 2 Mbit PRI is not in loopback mode.
The clock controller is switched on and disabled.
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 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.
The clock controller is switched off.
The DCHI is equipped and disabled.
The DCHI is equipped and enabled, but not
necessarily established.
The DCHI is switched off.
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Maintenance