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&Tn Diagnostic Test Commands. This set of commands
provides diagnostic tests that comply with the CCITT
V.54 recommendations. All connections established
during testing must be normal or direct connections.
(See S16, S18.)
&T0 Terminate test in progress. Generally during a test the
modem is on-line. Therefore to issue this command
you will need to type the escape sequence +++ and
wait for the OK message. You can then type AT&T0
<Enter> to terminate the test. Alternatively, if S18 is
nonzero, a test will terminate automatically after the
number of seconds specified in S18.
&T1 Local analog loopback test. This test checks the
operation of your modem's transmitter and re-
ceiver.
For example:
1.
2.
3.
4.
5.
6.
&T2 Reserved.
30
Your modem should be on-hook and in
command mode. Type AT\N0 <Enter>. This
specifies a normal connection.
Type AT S18=10 <Enter>. This specifies a test
period of 10 seconds.
Type AT &T1 <Enter>. This initiates the local
analog loopback test.
Type a simple character pattern. If your
modem is working properly, you will see this
character pattern echoed to the screen.
The test will end automatically after 10
seconds.
Return your modem to its original state by
typing ATZ <Enter>.
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