Initiating a Test
All of the diagnostic tests must be initiated from the asynchronous
command state (&Q0). To use the loopback tests:
Step 1:
Establish a connection (except when running Analog Loopback L3 test)),
and return to the command state by issuing the escape sequence (+++), or
if the &D1 DTR option is selected, by generating an on-to-off transition
on DTR.
Step 2:
Issue the appropriate &T command from the command state.
These tests are performed from the asynchronous command state. The tests
check out the modem functions and the quality of the communications link.
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