DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-432CO-TRK (Analog CO Trunk)
9
257 50176 Battery reversal detected. This is usually caused by the CO (often seen with
step-by-step and cross-bar offic es in connection with outgoing calls). This is
detected if the direction of the loop current c hang es 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.
513 57364 Ground detector stuck active. After several occurrenc es, 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 circuit pack. If test p asses, refer problem to CO. If any other error
code is received, pursue that prob lem.
769 57392 CO not releasing after call is dropped from PBX end (TN747B), or the loop is
not open after a disconnect (TN765). After several occurrences, an
off-board (TN747B) or on-board (TN465) warning alarm is generated. Refer
problem to CO.
2561 57345 Single polarity ring ing current. This error re sults from abnormal ring ing
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.
2817 57360 Ground but no ringing. This error occurs on an incoming call on a
ground-start trunk. If ringing is not detected within 5 second s of the Tip
being gro unde d, th e cal l is sti ll ac cep ted. If the C O is of the No . 5ESS.
switch type, ringing delays of more than 5 seconds during heavy traffic are
fairly common. Check for other errors.
2817 57393 On the TN465, 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.
3073 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.
Table 9-180. CO Trunk Errors with No Tests — Continued
Error
Type Aux
Data Error Description and Repair Action
Continued on next page