7.8
Voice/FaxChannelTesting
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
1Before 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.
2Place 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
3Talk 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.
4When 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)