Avaya G350 Maintenance Manual page 96

Avaya Communication Manager controlled maintenance
CO-TRK (Analog CO Trunk)
Check for the use of MFT/Range extenders. If there are extenders present, and there are no other
complaints or maintenance errors against this trunk, then there is a good chance that Test #3 failed
due to excessive loop current and may be ignored.
Table 47: CO Trunk Errors with No Tests 1 of 2
Error Aux
Type Data
1 57347
257 50176
513 57364
769 57392
2561 57345
96
Error Description and Repair Action
Port error. Ringing without ground. This error is detected on an
incoming call on a ground-start CO trunk. The CO trunk Media Module
has not detected a Tip ground before ringing current is detected. This
may indicate that the ground detector is not working. However, the call
will be accepted. Busyout the affected port, and run a long test. Observe
the test results. If any tests fail, refer to the description of the tests and
the associated error codes. Release the port. If users continue to report
troubles, check for other errors and make test calls to determine whether
the problem should be referred to the CO.
Battery reversal detected. This is usually caused by the CO (often seen
with step-by-step and cross-bar offices in connection with outgoing
calls). This is detected if the direction of the loop current changes from
normal to reverse for at least 40 msec. Could occur if the trunk was just
installed and for some reason the Tip and Ring wires were reversed at the
PBX. If battery reversals occur during dialing, wrong numbers may
result. Refer problem to CO. Ask them to remove the battery reversal
option.
Ground detector stuck active. After several occurrences, an on-board
minor alarm is generated. Run the short test sequence. If test aborts with
Error Code 1000, disconnect Tip and Ring and repeat short test. If test
still aborts, replace Media Module. If test passes, refer problem to CO. If
any other error code is received, pursue that problem.
CO not releasing after call is dropped from PBX end, or the loop is not
open after a disconnect. After several occurrences, an off-board warning
alarm is generated. Refer problem to CO.
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.) Another 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 will also fail. The
last cause could be that certain types of noise are present on the CO line
during the silent period of ringing. First check for other errors. If the
count for this error is very high (255), and all tests pass, then either the
reverse current detector is defective or the CO line is noisy. If the CO
line is suspect, make Tip and Ring observations. If the line is determined
to be noisy, refer the problem to the CO. If the reverse current detector is
defective, ignore this error.
Maintenance of the Avaya G350 Media Gateway
1 of 2
June 2004