Panasonic KX-TD500 Installation Manual page 267

5.2 Troubleshooting Guide
Digital trunk failure (out of synchornization)
Error Code 1318 wxx
w = 1 to 3 : Shelf number
xx = 01 to 14 : Slot number
Possible cause of T-1 card (physical number wxx) lost the synchronization with the clock time sent
the malfunction from the Central Office.
Countermeasures
Test Results NG
Replace the T-1 card
with a new one.
Note Another T-1 card with next priority will work as a master card, if more than two
T-1 cards were registered to the system by PC programming (TSW card
configuration) beforehand. Otherwise, the system will synchronize with the
system internal clock.
268
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
CUS. Then check the clock mode.
Check the cabling between "T-1 and CSU" and "CSU
and NIU". If not properly cabled, change the cabling.
Execute Loop Back Test (Internal).
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 T-1 carrier to check the line conditions. Or
check the equipment in other switching system which
your T-1 lines are connected with.
OK
NG
OK
NG
Test Results OK
NG
End
OK
Troubleshooting