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SoundExpression
Command Description
Select pulse dial make/break ratio
AT&P0 Selects a make/break ratio of 39/61 at 10pps. US and Canada. (default)
AT&P1 Selects a make/break ratio of 33/67 at 10pps. UK and Hong Kong.
Data Set Ready (DSR) signal
AT&S0 Causes DSR signal to be active at all times. (default)
AT&S1 Causes DSR signal to be active according to the ITU-T specification.
Test and diagnostics
AT&T0 Terminates any test in progress.
AT&T1 Executes the local analog loopback test.
AT&T3 Executes the local digital loopback test.
AT&T4 Enables the modem to accept a request from a remote modem for a
digital loopback test. (default)
AT&T5 Instructs the modem to deny a request from a remote modem for a digital
loopback test.
AT&T6 Executes the remote digital loopback test.
AT&T7 Executes the remote digital loopback test with a self test.
AT&T8 Executes the remote analog loopback test with a self test.
Disable Trellis Coding
AT&U0 Enabled (Trellis modulation with QAM modulation as a fallback.)
(DEFAULT)
AT&U1 Disabled (QAM modulation only).
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