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Glossary
A
algorithm . A formula or procedure which employs various methods
defining how data is to be used to give a prescribed result.
analog signals . Signals which can vary over a continuous range (e.g.,
the human voice over conventional telephone lines). Analog circuitry
is more subject to distortion and noise, but it is more capable of
handling complex signals than are digital signals which can have only
discrete values.
ARQ . Automatic Retry ReQuest for retransmission. A type of
communications link where the receiver asks the transmitter to re-
send a block of data when errors are detected.
ANSI . American National Standards Institute. A non-profit, private
industry association which governs most USA-standards setting
agencies.
ASCII . Acronym for American Standard Code for Information
Interchange. ASCII is an ANSI character set. The standard ASCII
character set consists of 128 decimal numbers (0-127) for letters of the
alphabet, numerals, punctuation marks, and common special
characters. The extended ASCII character set extends to 255 characters
and contains special mathematical, graphics, and foreign characters.
asynchronous communications . A method of transmission in which
one character is sent one bit at a time; also referred to as serial
transmission.
automode. Capability to automatically select the highest possible line
speed. Factors for highest possible line speed include: ITU-TSS
compliance, common capabilities of both modems and telephone line
quality.
B
Bell standard
s. Refers to the U. S. modulation protocol standards
developed by the former AT&T Bell Systems such as Bell 103 (300bps
transmission) and Bell 212A (1200bps transmission).
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