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Chapter 4—AT Commands, S-Registers, Result Codes
Command: &Tn V.54 Test Commands
Values: n = 0, 1, 3 or 6
Default: None
Description: &T0 Abort. Stop any test in progress.
&T1 Local analog loopback test.
&T3 Local digital loopback test.
&T6 Remote digital loopback test.
Note: To stop a test, you must use the escape sequence
(+++AT) before typing AT&T0.
Command: &V Display Current Settings
Values: n/a
Description: Displays the active modem settings, including the
callback security settings if callback security is enabled.
If the setup password has been entered, it also displays
the callback security passwords.
Command: &Wn Store Current Configuration
Values: n = 0
Default: None
Description: &W0 Stores current modem settings in nonvolatile memory
and causes them to be loaded at power-on or following
the ATZ command instead of the factory defaults. See
also the &F command.
&W1 Clears user default settings from nonvolatile memory
and causes the factory defaults to be loaded at power-
on or following the ATZ command.
Command: &Yn Select Stored Configuration for Hard Reset
Values: n = 0
Default: 0
Description: &Y0 Select stored configuration 0 on power-up. (For
backward compatibility with some software.)
&Y1 Not supportedresponds ERROR.