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COMSPHERE 3900 Series Modems
8-6 September 1998 3910-A2-GN32-40
Press the key until Rem_Digital_Loop appears. Press any function key to start this test.
F1
Test:Remote Loop
Started
F2
F3
The message Started appears on the LCD, and the Test LED lights for the duration of the test. If
Invalid Command appears on the LCD, another test is in progress. Select Abort to clear the
current test and try again. If the Test Timeout configuration option is enabled, Test Timeout
appears at the conclusion of the test. If it is disabled, the test operates until aborted. For more
information on the Test Timeout configuration option, refer to Test in Chapter 5, DCP
Configuration.
To exit this function and remain in the Test branch, press the
key. To exit and return to the
Top-Level menu, press the
key.
Loc Digital Loop
Loc Digital Loop is issued by a local modem and forces it to loopback any data received from
the remote modem (Figure 8-3). (This test operates the same as a ITU-T V.54 Loop 2 except it is
issued at your modem.) This is useful if a remote modem is incapable of initiating a remote
digital loopback from its location. For this test to operate properly, the modems must be
operating at the same rate and in Synchronous or Asynchronous Direct mode.
Figure 8-3. Local Digital Loopback
To access Loc Digital Loop from the Test branch, make the following selections: