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CO-TRK (CO Trunk)
Issue 5 October 2002
919
555-233-119
Table 160. CO Trunk Errors with NO Tests
Error
Type
Aux
Data Description and System Action System Technician Action
1 57347 Port error. Ringing without ground. This error is
detected on an incoming call on a ground-start
CO trunk. The CO trunk circuit pack has not
detected a Tip ground before ringing current is
detected. This may indicate that the ground
detector is not working. However, the call is
accepted. See Note 1 at end of table.
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.
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