Panasonic KX-TD500 Installation Manual page 302

5.2 Troubleshooting Guide
(23) Digital trunk failure (out of synchronisation)
Error Code
Possible cause of
the malfunction
Countermeasures
Note
302
1318 xyy : Digital trunk out of sync
x = 1 to 3 : Shelf number
yy = 01 to 14 : Slot number
T1, E1, or PRI30 card (physical number xyy) lost the synchronisation
with the clock time sent 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, E1 or PRI30 and
CSU" and "CSU and NIU". If not properly cabled,
change the cabling.
Execute Loop Back Test (Internal).
Test Results NG
Replace the T1, E1 or
PRI30 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, E1 or PRI30 carrier to check the line
conditions. Or check the equipment in other switching
system which your T1, E1 or PRI30 lines are
connected with.
Another T1, E1 or PRI30 card with next priority will work as a master
card, if more than two T1, E1 or PRI30 cards were registered to the
system by PC programming (TSW card configuration) beforehand.
Otherwise, the system will synchronise with the system internal clock.
NG
NG
Test Results OK
NG
NG
End
OK
OK
OK
Troubleshooting