| 
  | 4 AT Commands,   | 
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 se-  | 
  | 
  | curity settings if callback security is enabled. If the setup pass-  | 
  | 
  | word 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   | 
  | 
  | command instead of the factory defaults. See also the &F com-  | 
  | 
  | mand.  | 
  | &W1  | Clears user default settings from nonvolatile memory and  | 
  | 
  | causes the factory defaults to be loaded at   | 
  | 
  | ing the ATZ command.  | 
Command:  | &Yn  | Select Stored Configuration for Hard Reset | 
Values:  | 
  | n = 0  | 
Default:  | 
  | 0  | 
Description:  | &Y0  | Select stored configuration 0 on   | 
  | 
  | compatibility with some software.)  | 
  | &Y1  | Not   | 
Command: &Zy=x  | Store Dialing Command | |
Values:  | 
  | y =   | 
  | 
  | enabled)  | 
  | 
  | x = Dialing command  | 
Default:  | 
  | None  | 
Description:  | 
  | Stores dialing command x in memory location y. Dial the  | 
  | 
  | stored number using the command ATDS=y. See also the  | 
  | 
  | #CBSn command. For callback security options, see Chapter 6.  | 
Command:  | &&S  | Speaker Codec Loopback | 
Values:  | 
  | n/a  | 
Description:  | 
  | Provides a loopback from the microphone to the speaker. For  | 
  | 
  | testing and debugging only.  | 
37