Panasonic KX-TD500 Installation Manual page 312

Troubleshooting
(28) Digital trunk failure (DSP link failure)
Error Code
Possible cause of
the malfunction
Countermeasures
Note
312
1328 xyy: DSP-1 link failure
x = 1 to 3: Shelf number
yy = 01 to 14: Slot number
1.
DSP (Digital Signal Processor) link failure of T1 card occurred.
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 and CSU" and "CSU
and NIU." If not properly cabled, change the cabling.
Execute Loop Back Test (Internal).
Test Results NG
Replace the T1 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 carrier to check the line conditions.
Or check the equipment in other switching system which
your T1 lines are connected with.
Another T1 card with next priority will work as a master card, if more
than two T1 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
Installation Manual
OK
OK
OK