Maintenance Object Repair Procedures
555-233-123
10-442 Issue 4 May 2002
257 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. The CO should be
asked to remove the battery reversal option.
Refer problem to CO.
513 57364 Ground detector stuck active. After several
occurrences, an on-board minor alarm is
generated.
Run short test. If test aborts
with Error Code 1000,
disconnect Tip and Ring and
repeat short test. If test still
aborts, replace circuit pack. If
test passes, refer problem to
CO. If any other error code is
received, pursue that problem.
769 57392 CO not releasing after call is dropped from
PBX end (off-board alarm after several
occurrences), or the loop is not open after a
disconnect (on-board alarm after several
occurrences).
For off-board alarm, refer
problem to CO. For on-board
alarm, the circuit pack has an
on-board problem (for
example, stuck relay) and
should be replaced.
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.) 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 also fails.
The last cause could be that certain types of
noise are present on the CO line during the
silent period of ringing.
Check for other errors first and
then see Note 4 at end of
table.
Table 10-164. CO Trunk Errors with NO Tests — Continued
Error
Type
Aux
Data Description and System Action System Technician Action
Continued on next page
To Next Page
Loading...
