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GL-2GLOSSARY

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American National	See ASCII.
Standard Code for
Information Interchange
analog	The representation of information by means of continuously varying
	physical quantities such as amplitude, frequency, phase, or resistance.
analog voice terminals	An analog voice terminal (telephone) receives acoustic voice signals and
	sends analog electrical signals along the line. These voice terminals are
	served by a single wire pair (tip and ring). The Model 2500 telephone set
	is a typical example of an analog voice terminal.
ARS	See Automatic Route Selection.
ASCII (American	The standard code, using a coded character set consisting of 7-bit coded
National Standard Code	characters (eight bits, including parity check), used for information
for Information	interchange among data processing systems, data communications
Interchange)	systems, and associated equipment. The ASCII set consists of control
	characters and graphic characters.
asynchronous data	A data module that allows data terminal equipment (DTE) to communicate
module (ADM)	with the Integrated Services Digital Network basic rate interface (ISDN-
	BRI).
asynchronous data stand	An asynchronous data unit (ADU) that is built into the base of a digital
(ADS)	telephone and is used to connect RS-232C equipment such as a data
	terminal with a communications system via the telephone’s data link. See
	also asynchronous data unit.
asynchronous data	A method of transmitting data in which each character is preceded by a
transmission	start bit and followed by a stop bit, thus permitting data characters to be
	transmitted at irregular intervals. Also called asynchronous transmission.
	See also synchronous data transmission.
asynchronous data unit	A data circuit-terminating equipment (DCE) device that allows direct
(ADU)	connection between RS-232C equipment and a communications system.
	See also asynchronous data stand.
asynchronous	See asynchronous data transmission.
transmission
Audio Information	See AUDIX.
Exchange
AUDIX (Audio	A fully integrated voice-mail system that can be used with a variety of
Information Exchange)	communications systems to provide call-history data, such as subscriber
	identification and reason for redirection. See also AUDIX Standalone,
	Call Transfer into AUDIX, and voice-mail system.