Avaya S8700 Maintenance Manual page 1298

Maintenance-Object Repair Procedures
c. Aux data 57376—No loop current on incoming call
Aux data 57424—No loop current on outgoing call
These errors cause the Dial Tone test (#0) to run and are only considered a
problem if the Dial Tone test fails (in which case Error Type 1537 also
appears). In this case, the trunk may be put in Ready-for-Service state
(shown as "disconnected" by status command), which allows only incoming
calls. Run the Dial Tone test (#0) and follow its procedures.
d. Single polarity ringing current—This error results from abnormal ringing
current, but does not prevent the incoming call from being accepted. This
error code is logged for information purposes only and does not cause
additional testing to occur.
e. Late CO Trunk release—This indicates that the CO releases the trunk at
least four minutes after the PBX dropped the call. This error code is only
logged as an informational event and causes no other testing to occur.
Table 8-233. DIOD Trunk Errors without Associated Tests
Error Aux
Type Data Description and Recommendation
769 57392 CO not releasing after call is dropped from PBX end (TN747B), or the loop is
not open after a disconnect (TN765). After several occurrences, an off-board
(TN747B) or on-board (TN465) warning alarm is generated. Refer problem to
CO.
2561 57345 Single polarity ringing current. This error results from abnormal ringing current,
but does not prevent the incoming call from being accepted. One cause could
be that the reverse current detector associated with the port is failing. (Will not
be detected by any tests.) The other cause could be that normal current is not
detected. In this case, neither incoming nor outgoing calls can be completed,
and the dial tone test also fails. Check for other errors.
2817 57393 CO released the trunk at least four minutes after the PBX dropped the call.
This error code is log only and causes no other testing to occur. No alarm is
generated. Check for other errors.
3073 57376 No loop current on incoming call. The incoming destination has already
answered and no loop current has been detected. If this is a hard fault, the dial
tone test and every outgoing call should also fail. Check for other errors.
3585 57424 No loop current on outgoing call. This error occurs on attempt to seize a loop
or ground-start trunk for an outgoing call. An error occurs if loop current is not
detected or the caller hangs up before it is detected. Busyout the affected port,
and run a Long test. If the Dial Tone test (#0) passes, ignore this error.
Release the port.
8-576 Issue 1 May 2002 555-233-143