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Glossary-13825-A2-GB30-20 November 1996
Glossary
Active (Operating) A configuration area containing configuration options currently in use by the modem. When a
power cycle occurs, a reset is performed, or a save is issued, this area is updated with the contents
of Active (Saved).
Active (Saved) A nonvolatile configuration area containing the most recently saved configuration options. Any
changes made to configuration options can be saved by issuing an AT&W0 command.
analog loop See local analog loop.
analog signal A type of signal composed of continuously variable values, used to transmit voice or data over
telephone lines.
Answer mode The modem is in a state where it is ready to receive an incoming call. For example, an ATA
(Answer) command has been issued to place the modem into online answer mode. The modem
has been forced off-hook and is generating an answer tone, beginning the handshaking process
with the calling modem.
ASCII This code (American Standard Code for Information Interchange) is a 7-bit code which
establishes compatibility between data services. ASCII is the standard for data transmission over
telephone lines. The ASCII code consists of 32 control characters (nondisplayed) and
96 displayed characters.
asymmetric rate In V.34, the ability of a device to transmit at a different rate than it receives.
Async Dial A factory preset configuration area containing the configuration options most often used in
asynchronous dial networks.
asynchronous transmission A data transmission that is synchronized by a transmission start bit at the beginning of a character
(five to eight bits) and one or more stop bits at the end.
AT command set A group of commands, issued from an asynchronous DTE, that allow control of the modem while
in Command mode. All commands must begin with the characters AT and end with a carriage
return.
AT prefix A prefix issued before every AT command (except A/ and +++) which identifies the DTE’s data
rate, parity, and character length.
autobaud To automatically determine the asynchronous DTE data rate.
automatic answer A capability to respond to a call received over a dial line.