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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-306CO-TRK (CO Trunk)
10
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 10-100. CO Trunk Errors with NO Tests — Continued
Error
Type
Aux
Data Description and System Action System Technician Action
Continued on next page