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Test Branch
7-53980-A2-GB30-40 October 1998
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 7-3). (This test operates the same as an
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 online and in
Synchronous or Asynchronous Direct mode and, if set for
V.34 modulation, must not be in Asymmetric Rate mode.
To access Loc Digital Loop from the Test branch, make
the following selections:
F1
Test :
Loc_Digital_Loop
F2
F3
Press the key until Loc Digital Loop appears. Press
any function key to start this test.
F1
Test : Digitl Loop
Started
F2
F3
The message Started appears on the LCD and the Test
LED lights.
If the message Invalid Command appears on the
LCD, then another test is in progress. Select Abort to clear
the current test and then select Loc Digital Loop.
If the Test Timeout configuration option is enabled,
Test Timeout appears at the conclusion of the LCD. If it is
disabled, the test operates until aborted. For more
information on the Test Timeout configuration option,
refer to the Test section in Chapter 8, Configure Branch.
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.
AT Command Equivalent
The AT command for Local Digital Loopback is &T3.
Figure 7-3. Local Digital Loopback