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Glossary
This glossary defines abbreviations and new
or special terms used in this publication.
Some of the definitions are taken from the
IBM Dictionary of Computing. The letters in
the parentheses that follow some definitions
indicate the source of the definition:
(A) The American National Standard
Dictionary for Information Systems, ANSI
X3.172-1990, copyright 1990 by the American
National Standards Institute (ANSI).
(E) The ANSI/Electronic Industries
Association (EIA) Standard-440-A, Fibre Optic
Terminology.
(I) The Information Technology Vocabulary,
developed by Subcommittee 1, Joint
Technical Committee 1, of the International
Organization for Standardization and
International Electrotechnical Commission
(ISO/IEC/JTC1/SC1).
(IBM) The IBM Dictionary of Computing,
copyright 1994 by IBM.
(T) Draft international standards committee
drafts, and working papers being developed
by the ISO/IEC/JTC1/SC1.
A
access time The time interval between the
instant at which a call for data is initialized
and the instant at which the delivery of data
is completed. (T)
adapter Hardware used to join different
optical fiber connector types. (IBM)
Also, any hardware used to join different
connector types.
address A character or group of characters
that identifies a register, a particular part of
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storage, or some other data source or
destination. (A)
Advanced Interactive Executive (AIX)
IBM's implementation of the UNIX
(trademark of AT&T Bell Laboratories)
operating system. The RISC System/6000
system, among others, runs the AIX operating
system. (IBM)
AIX See Advanced Interactive Executive.
alphanumeric Pertaining to data that
consist of letters, digits, and usually other
characters, such as punctuation marks. (T)(A)
applications software Software that is
specific to the solution of an application
problem. (T)
automatic checking test See checksum.
B
backup Pertaining to a procedure,
technique, or hardware used to recover lost
or destroyed data or to keep a system
operating. (T)
beginning-of-tape The location on a tape
where written data begins.
bin A place in which a cartridge resides in a
library. A bin can be an input bin or an
output bin.
block A collection of contiguous records
recorded as a unit. Interblock gaps separate
blocks, and each block can contain one or
more records.
buffer A routine or storage that
compensates for a difference in the rate of
data flow, or the time of occurrence of events
when transferring data from one device to
another.
Ninth Edition
Glossary-1
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