Panasonic KX-TD500 Installation Manual page 311

(27) Digital trunk failure (error rate over)
Error Code
Possible cause of
the malfunction
Countermeasures
Note
Installation Manual
1325 xyy: Digital trunk error rate over
x = 1 to 3: Shelf number
yy = 01 to 14: Slot number
1.
The PBX exceeded the number of multiframe errors per second
which the PBX required to recognize the remote alarm.
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.
Try Loop Back Test again.
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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