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DEFINITY Communications System
GLOSSARY
7400B Data Module
User’s Guide
Page GL-1
GLOSSARY
ANSI display protocol. A standard set of escape sequences, established
by ANSI (the American National Standards Institute), used by many
display terminal devices to transmit or receive display control functions,
such as cursor movement and color or graphics configuration
parameters.
Asynchronous data communications. A method of communicating
data in which each “character” (a 7 or 8 bit data word) is sent or
received separately at a selectable data transfer rate, and is framed by
extra bits preceding and following the character. Various error-
checking methods use the total bit-count to determine whether the
character received at one end of the data path is the same as the one sent
at the other end. Also called asynchronous mode, this method, as
opposed to synchronous mode, does not use a clock signal to meter data.
(Since the 7400B Data Module operates only in asynchronous mode,
synchronous mode is not defined in this glossary.) See also data
options.
AT command set. A de facto industry-standard set of commands used
for configuration and operation of DCE devices or modems. The AT
(Attention) command set originated with Hayes Microcomputer
Products, Inc. The AT&T 7400B Data Module uses a subset of the full
AT command set.
Command files. Files created for or by data communications software
running on a PC that can be used to execute a sequence of commands to
complete a task, such as performing an automatic log in to a specific
remote device. Also called script files.
Command line. A string of one or more valid and compatible AT
commands typed on one line with any applicable arguments. Most
command lines begin with the AT prefix and end with a carriage return
(issued by pressing
[ Enter ]).
Command mode. An operating mode in which the 7400B Data Module
looks at all characters coming from its associated terminal device and
attempts to interpret them as commands. See also on-line mode.
Communications parameters. See data options.
Configuration profiles. See option profiles.
Data Communications Equipment. (DCE, also Data Circuit-
terminating Equipment) The equipment that provides the functions
required to establish, maintain and terminate a data communications
connection. The DCE also provides any required signal conversion for
communication between the data terminal equipment (DTE) and the
telephone line or data circuit.