Cause
Signaling channel has been down for over 90 sec.
Proposed Solution 1
Procedure
Consult ISDN-SGRP, ISDN-SLK and/or SYS-LINK. Far-end terminal adapter may currently be restarting.
Cause
Repeated failure of far end to respond to messages.
Proposed Solution 2
Procedure
Maintenance software will periodically try to resend messages. You can speed the process with test port location (Test #256).
Cause
The far-end port is being tested.
