Avaya G250 Maintenance Manual page 121

If test fails after two repetitions, replace media module.
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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 46: CO Trunk Errors with No Tests
Error Aux
Type Data
1 57347
257 50176
513 57364
769 57392
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.
CO-TRK (Analog CO Trunk)
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Issue 1.1 June 2005 121