A-2
A
PPENDIX
A: T
ROUBLE
C
LEARING
AND
T
ECHNICAL
S
PECIFICATIONS
NAC LED indicators
Correcting NAC
alarms and/or error
conditions
Refer to the NAC’s Product Reference for additional hardware trouble
clearing information. The NAC’s user interface (UI) console has status
screens that supply information on power-up self tests and card status.
Physical State
Carrier
LED
State
Alarm
LED State
Loop back/
D-channel
LED State
Condition/Physical State
F1
Green
Off
Off
No Alarm
F2
Red
Off
Off
Yellow Alarm
Remote Frame Alarm
F3
Off
Red
Off
Red Alarm
Loss of Signal
F4
Off
Red
Off
Red Alarm
Out of Frame
F5
Green
Red
Off
Blue Alarm
Unframed all ones
F6
Red
Red
Off
CRC & RAI
Amber
D-Channel down
Green
Off
Green
Loop Back in Progress
Alarm/Error
Level
Diagnosis/Trouble Clearing
Remote Frame
Alarm
Yellow
The remote end has lost the HiPer DSP’s framing or
signal and sends this alarm to the HiPer DSP.
Loss of Signal
Red
The received T1 or E1 signal has been lost. The HiPer
DSP declares a red alarm and sends a yellow alarm to
the remote end.
Out of Frame
Red
The received T1 or E1 framing has been lost and the
framed payload can no longer be received. The HiPer
DSP declares a red alarm and sends a yellow alarm to
the remote end.
Unframed all
ones
Blue
The remote end is sending out an all ones signal. This is
usually done when the remote end can not send out a
framed signal.
RFA and
Continuous
CRC errors
N/A
The HiPer DSP has received excessive CRC errors in a
one second period and declares state F5. For E1-PRI
certification this is less than 931 errors in one second.
