Avaya G700 Maintenance Manual page 124

6 Avaya MultiVantage Software-Controlled Maintenance:
Table 63. CO Trunk Errors with No Tests Continued
Error
Type
257
513
769
2561
2817
2817
3073
124
Aux Error Description and Repair Action
Data
50176 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.
57364 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.
57392 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 .
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.) 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.
57360 Ground but no ringing. This error occurs on an incoming call on a
ground-start trunk. If ringing is not detected within 5 seconds of the
Tip being grounded, the call is still accepted. If the CO is of the No.
5ESS. switch type, ringing delays of more than 5 seconds during
heavy traffic are fairly common. Check for other errors.
57393 The loop is opening too slowly after a disconnect. This error
indicates an on-board problem, although the trunk may be
functional. Check for other errors.
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 all outgoing calls should also
fail. Check for other errors.
CO-TRK (Analog CO Trunk)
Maintenance for S8300/S8700 and G700
555-234-101 — Issue 2 — October 2002
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