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 &T - modem test modes

 &T      Same as &T0.
 &T0     Terminate test in progress.
 &T1     Local analog loopback test.
 &T3     Local digital loopback test.
 &T4     Enable remote test requests.
 &T5     Disable remote test requests.
 &T6     Remote digital loopback test.
 &T7     Remote digital loopback with self-test.
 &T8     Local analog loopback with self-test.

 Remote test requests are enabled by default.  If you leave them on,
 some line-noise sequences can put the modem into test mode.  This is
 difficult to detect and handle.  For safety, we recommend turning off
 remote testing.

 Default setting: &T4        Recommended setting: &T5

 Example:

     SendModem(nPort, "AT&T5" + chr(13))