CO-TRK (CO Trunk)
Issue 4 May 2002
10-441 555-233-123
These errors cause the Dial Tone Test (#0) to run and are only considered
a problem if the Dial Tone Test fails (in which case Error Type 1537 also
shows up). In this case, the trunk may be put in “Ready-for-Service” state
(shown as “disconnected” by status command), which allows only incoming
calls. Run the Dial Tone Test (#0) and follow its outlined procedures.
If error count associated with this error type is very high (that is, 255) and if
Alarm Status on the Hardware Error Report is “n” (not alarmed), then the
existence of this error type indicates that, despite the fact that many in-line
error messages have been received, all Call Seizure Tests have passed.
Problems at the CO may cause this condition rather than problems with the
PBX.
e. These errors are logged for all versions of the CO-TRK/CO-BD. However,
no MINOR alarms are generated for Central Office Trunks [TN747B] with
vintages V8 or greater. Any failures received by this test are still logged as
Error type 1025/1281 as additional information for the system technician
person.
The system technician person should check for the use of MFT/Range
extenders. If there are extenders present, and there are no other
complaints or maintenance errors against this trunk, then there is a good
chance that Test #3 failed due to excessive loop current and may be
ignored.
f. Test calls made by the Automatic Transmission Measurement System
(ATMS) returned measurements that were outside the acceptable limits.
Use the list testcall detail command to examine specific transmission
parameters that are out of spec, and investigate the trunk for that kind of
noise. If the noise is acceptable, the limits administered on the “change
trunk” screen should be changed.
Table 10 -164. CO Tr unk Errors with N O Te sts
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.
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