AT&T administration and, Installation And Maintenance Manual

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Possible Cause
5. Faulty telephone company
wiring (Continued).
6. Faulty network interface
line adapter.
Possible Solution
Step 2. Replace the wiring
with a cord this is known to
work and try to place calls.
If the calls go through. the
wire you replaced is faulty.
(You may want to plug the
faulty wire into a different
jack and attempt to make
calls to verify that the wire is
indeed faulty.)
Replace the network
interface’s line adapter with
another one. Plug the basic
telephone into each of the
jacks, and try to place an
outside call
If the trouble does not appear
on the basic telephone, the
old line adapter is faulty.
Replace it with a new line
adapter.
To Investigate Further
If the calls still do not go
through, contact the
equipment supplier.
If the trouble still appears on
the basic telephone, the
outside lines are faulty.
Report the trouble to the
local telephone company
representative.
Procedures for Specific Symptoms 4-33