COMSPHERE 3900 Series Modems
8-4
September 1998
3910-A2-GN32-40
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.
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
NOTE
For tributary modems only, the test is delayed 30 seconds to allow
any outstanding network management messages to propagate
upstream before the VF channel is interrupted by the test.
