Lucent Technologies 7400B manual AT Command Description, More, AT Command Subset

DEFINITY Communications System	CHAPTER 3: FIRST TIME USERS
7400B Data Module
User’s Guide	Page 3-3

AT Command	Description
AT	The command prefix that must be typed as the first two letters of
	all AT commands except +++ and A/. This prefix gets the
	AT tention of the data module.
	Note: The characters of the AT prefix must both be typed in
	either uppercase or lowercase letters (AT or at will
	work, but At or aT will not). Typing a space between
	the AT prefix and the next command on the line is
	optional, but do not separate the two letters “AT” with
	a space.
D	The Dial command. This command follows the AT and precedes
	the number that you wish your data module to dial. For example:
	atd71204 [ Enter ]
	Note: Other commands may precede the D command, but
	any characters following it will be interpreted as part
	of the number that is to be dialed.
A/	The redo or Again command. This is one of the two commands
	that does not require the AT prefix. To repeat the previous
	command line exactly, type A/ without pressing [ Enter ].
	(more)

TABLE 3-2 AT Command Subset