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LED INDICATION
LED
NORMAL
RUN
Flash
(120 IPM)
LC
On
CRC
Off
PCM
Off
FRM
Off
RMT
Off
AIS
Off
Alarm Indications on 24PRT
FAULT
CAUSE
On or Off
Abnormal opera-
tion of PRT card
Off
ISDN Primary Rate
D-channel data link
connection failure
On
Bit Error Rate
exceeds the prede-
termined value
On
No PCM signals
arrive from the dis-
tant office
On
Frame Alignment
signals from the
distant office can-
not be received
On
Frame Alignment
signals cannot be
sent to the remote
PBX
On
Remote PBX is in
the local loopback
state
– 319 –
CHAPTER 5 OPERATION TEST
INTEROFFICE TRANSMISSION LINE TEST
FAULT
ACTION
1
Confirm the programming data:
CM05 Y=0/Y=1, CM07 Y=01.
2
Check to see if the SENSE switch
is set as per the AP number (04-
15, 20-31) assigned by CM05
Y=0.
3
Reset the MB switch
(Down→Up→Down)
If the fault cannot be cleared,
4
replace the card.
Check the status of the local office line
or public network line.
1
Check the receive line and exter-
nal equipment.
2
Replace the remote PRT card.
1
Check to see if the line is correctly
connected to the PRT card.
2
Plug and unplug the PRT card.
Repeat this two or three times.
Check the receive line and exter-
1
nal equipment.
2
Replace the remote PRT card.
1
Check the transmission line and
external equipment.
2
Replace the PRT card.
Check the switch settings of the remote
PRT card.
NWA-008852-001 Rev.5.0
98ch5001.fm
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