Test Mode Operation
7-2
V.3600
LDL, RDL, and RDL/TP tests are initiated after making an online data
connection in normal or direct mode only. LAL and LAL/TP are
initiated while in offline command mode. These tests can be initiated by
AT
commands or by using the LCD front panel
SELECT TEST
menus.
Refer to Table 7-2.
Note
Bold text indicates command parameter defaults.
Terminating a Test in Progress — Q&T
Tests can be terminated manually or automatically. The
&T
command
terminates a test manually. The modem automatically goes to command
mode during LDL, LAL/TP, and RDL/TP tests. Enter the
&T
command
to terminate the tests. For LAL and RDL, enter the escape sequence
(
+++
) before the
&T
command to go to the command mode.
By preloading register
S18
with 1 to 255, each test mode automatically
times out after the specified number of seconds and exits back to the
command mode. Loading
S18
with 0 disables the auto timeout feature
and the test will run continuously until manually terminated.
For example, to run the self test analog loopback test for 30 seconds,
enter
ATS18=30&T8
The modem should respond with 000 after 30 seconds.
Table 7-2. Test Commands
Command
Operation
&T
Terminate any test
&T1
Initiate local analog loopback test
&T3
Initiate local digital loopback test
&T4
Grant remote requested digital loopback
&T5
Deny remote requested digital loopback
&T6
Initiate remote digital loopback test
&T7
Initiate remote digital loopback with test pattern
&T8
Initiate local analog loopback test with test pattern
%T
Transmit test pattern
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