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GL-2 GLOSSARY
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American National
Standard Code for
Information Interchange
See ASCII.
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
National Standard Code
for Information
Interchange)
The standard code, using a coded character set consisting of 7-bit coded
characters (eight bits, including parity check), used for information
interchange among data processing systems, data communications
systems, and associated equipment. The ASCII set consists of control
characters and graphic characters.
asynchronous data
module (ADM)
A data module that allows data terminal equipment (DTE) to communicate
with the Integrated Services Digital Network basic rate interface (ISDN-
BRI).
asynchronous data stand
(ADS)
An asynchronous data unit (ADU) that is built into the base of a digital
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
transmission
A method of transmitting data in which each character is preceded by a
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
(ADU)
A data circuit-terminating equipment (DCE) device that allows direct
connection between RS-232C equipment and a communications system.
See also asynchronous data stand.
asynchronous
transmission
See asynchronous data transmission.
Audio Information
Exchange
See AUDIX.
AUDIX (Audio
Information Exchange)
A fully integrated voice-mail system that can be used with a variety of
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.