CHAPTER 2 TROUBLESHOOTING
– 177 – NWA-008847-001 Rev.3.0
a6ch2001.fm
Remedial Action on Each Lamp Status
Continued on next page
CARD NAME
LAMP
STATUS
FAULT
CONTENT
REMEDIAL ACTION
PN-24CCTA
(CCT)
RUN lamp is not
flashing
Abnormal opera-
tion of CCT card
Confirm the programming data:
CM05 Y=0/Y=1, CM07 Y=01.
Check to see if the SENSE switch is
set as per the AP Number (04-15,
20-31) assigned by CM05 Y=0.
Reset the MB switch.
(Down Up Down)
If the fault cannot be cleared,
replace the card.
LC lamp is not on Common signaling
channel data link
connection failure
Check the local office line or public net-
work line.
CRC lamp is on Bit Error Rate
exceeds the prede-
termined value
Check the receive line and external
equipment.
Replace the remote CCT card.
PCM lamp is on No PCM signals
arrive from the
distant office
Check to see if the line is correctly
connected to the CCT card.
Plug and unplug the CCT card.
Repeat this two or three times.
FRM lamp is on Frame Alignment
signals from the
distant office can
not be received
Check the receive line and external
equipment.
Replace the remote CCT card.
RMT lamp is on Frame Alignment
signals cannot be
sent to the remote
PBX
Check the transmission line and
external equipment.
Replace the CCT card.
AIS lamp is on Remote PBX is in
local loopback
state
Check the switch settings of the remote
CCT card.
1
2
3
4
1
2
1
2
1
2
1
2
FAULT DIAGNOSIS AND TROUBLESHOOTING
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