7.8
Voice/Fax Channel Testing
The voice/fax loopback test is confined to the MultiMux that the test is being run on. the loopback test communicates
between the two channels on the voice/fax board without going outside the MultiMux. An important factor to consider
before running this test is to ensure that the local and remote interfaces for both channels are set up correctly. This
test could isolate a voice/fax channel of a MultiMux as being defective.
Table 7-6. Voice/Fax Channel Testing Procedure
Step
Procedure
1 Before running the Voice/fax Loopback test, reconfigure the local interface type on voice/fax channel 1 to be the
same as the remote interface type on channel 2. Do the same thing for the local and remote interfaces on
channel 2. When this test is initiated, voice/fax channel 1 communicates with voice/fax channel 2 and vice/versa
on the same MultiMux unit.
2 Place the local MultiMux unit in Test Mode 12 (i.e., executing the voice/fax Loopback test) by entering the
following command.
AT&T12 (hit Return)
The supervisory console will display the following message:
VOICE/FAX LOOPBACK - TEST #12
3 Talk over one of the voice/fax channels and listen over the other channel. The voice quality should be the same
as if your were talking over the composite link. The voice/fax loopback test only ensure that both channels are
communicating.
4 When you have verified that the voice/fax channels are operating correctly, enter the following to end the test:
ATZ (hit Return)
or
AT&T0 (hit Return)
