
COMSPHERE 392xPlus Modems
8-4 October 1998 3920-A2-GH30-40
Loc Analog Loop
Loc Analog Loop performs a local analog loopback (ITU-T V.54 Loop 3), Figure 8-1, that
verifies modem operation as well as the connection between the DTE and modem. The modem
must be offline and in Synchronous or Asynchronous Direct mode to perform this test, otherwise
Invalid Command appears.
NOTE
If you are performing a Local Analog Loop test on a TMp
modulation that is running a test pattern with a constant flow of
data, you must toggle the RTS switch off and then on to allow the
modem to train up.
Figure 8-1. Local Analog Loopback
To access Loc Analog Loop from the Test branch, make the following selections:
F1
Test:
Loc_Analog_Loop
F2
F3
Press the key until Loc Analog Loop appears. Press any function key to start this test.
F1
Test:Local Loop
Started
F2
F3
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