Panasonic KX-TD500 Installation Manual page 309

(25) Digital trunk failure (AIS signal reception)
Error Code
Possible cause of
the malfunction
Countermeasures
Note
Installation Manual
1320 xyy: Digital trunk AIS signal reception
x = 1 to 3: Shelf number
yy = 01 to 14: Slot number
1.
T1/PRI23 card (physical number xyy) received the AIS (Alarm
Indication Signal) signal from the Central Office.
Confirm that the setting of "Frame Sequence" and "Line
Coding" are matched with that of the leased lines. If not,
change the setting of your KX-TD500 and CSU. Then check
the clock mode.
Check the cabling between "T1/PRI23 and CSU" and
"CSU and NIU." If not properly cabled, change the cabling.
Execute Loop Back Test (Internal).
Test Results NG
Replace the T1/PRI23 card
with a new one.
Execute Loop Back Test (External : between KX-TD500 and
CSU).
OK
Check the CSU. If not good, replace it with a new one.
Ask the T1/PRI23 carrier to check the line conditions.
Or check the equipment in other switching system which your
T1/PRI23 lines are connected with.
Another T1/PRI23 card with next priority will work as a master card, if
more than two T1/PRI23 cards are registered to the system by PC
programming (TSW card configuration) beforehand. Otherwise, the
system will synchronize with the system internal clock.
NG
NG
Test Results OK
NG
NG
End
Troubleshooting
OK
OK
OK
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