Maintenance Failure - AT&T Network Adapter 25 Installation And Maintenance Manual

Station, Wiring, and Trunk Problems
If the system indicates that a fault is with a station, or if a user complaint
indicates a station problem, the trouble must be isolated to the station itself
or to the wiring between the cabinet or station interconnect panel and the
station.
The station wiring, particularly the mounting cord, should be visually
inspected in cases of station trouble reports. A dead station could be caused
by a loose mounting cord. Station trouble can also occur when wiring is
crushed or severed by furniture or traffic. Stations can be swapped with
known good stations of the same type to help isolate the trouble.
Trunk problems reported by alarms or by users can be evaluated with tests
from stations or by interpreting the error log. If trunk troubles appear to be
outside the System 25, the responsible common carrier should be asked to
make repairs.
Automatic Maintenance Tests
Because System 25 maintenance tests are performed automatically, no
provision is made for users or technicians to initiate maintenance tests. The
error log is read by entering commands from the SAT. Additional information
that may help in clearing complex or subtle troubles is also available through
the SAT (for example, the record of port locations).
Refer to the Administration Manual (555-540-500) for information on using
"Search" procedures from the SAT as an aid in troubleshooting.

Maintenance Failure

If a System 25 equipment problem cannot be corrected using the procedures
in this manual, follow established maintenance escalation procedures.
MAINTENANCE
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