Panasonic KX-TD500 Installation Manual page 256

4.5 Error Log
Error Code
#1318 Digital trunk out of sync
#1319 Digital trunk RAI signal
reception
#1320 Digital trunk AIS signal
reception
#1323 Digital trunk frame failure On booting-up of T1, E1 card (physical number XXX), it
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Error Message
T1, E1, BRI or PRI30 card (physical number XXX) lost
the synchronization with the clock time sent from the
Central Office.
T1, E1 card (physical number XXX) received RAI
(Remote Alarm Indication) signal sent from the Central
Office.
T1, E1 card (physical number XXX) received AIS
(Alarm Indication Signal) signal sent from the Central
Office.
failed to synchronize with the clock time sent from the
Central Office.
Cause
Utility