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Glossary

This glossary defines terms and abbreviations used in
this manual. It includes terms and definitions from the
IBM Dictionary of Computing (New York; McGraw-Hill,
Inc., 1994).

(A) Identifies definitions from the

American National

Standard Dictionary for Information Systems, ANSI
X3.172-1990, copyright 1990 by the American
National Standards Institute (ANSI). Copies can be
purchased from the American National Standards
Institute, 1430 Broadway, New York, New York
10018.

(E) Identifies definitions from the

ANSI/EIA Standard -

440A: Fiber Optic Terminology, copyright 1989 by
the Electronics Industries Association (EIA). Copies
can be purchased from the Electronic Industries
Association, 2001 Pennsylvania Avenue N.W.,
Washington, DC 20006.

(I)

Identifies definitions from the

Information

Technology Vocabulary, developed by
Subcommittee 1, Joint Technical Committee 1, of
the International Organization for Standardization
and the International Electrotechnical Commission
(ISO/IEC JTC1/SC1).

(T) Identifies definitions from draft international

standards, committee drafts, and working papers
being developed by ISO/IEC JTC1/SC1.

The following cross-references are used in this glossary:

Contrast with

This refers to a term that has an opposed or
substantively different meaning.

See

This refers the reader to multiple-word terms in
which this term appears.

See also

This refers the reader to terms that have a related,
but not synonymous, meaning.

Synonym for

This indicates that the term has the same meaning
as a preferred term, which is defined in the
glossary.

If you do not find the term you are looking for, refer to
the index or to the

IBM Dictionary of Computing.

A. ampere.

AAL. ATM Adaptation Layer

ac. Alternating current.

active. (1) Able to communicate on the network. A
token-ring network adapter is active if it is able to
transmit and receive on the network. (2) Operational.
(3) Pertaining to a node or device that is connected or is
available for connection to another node or device.
(4) Currently transmitting or receiving.

adapter. In a LAN, within a communicating device, a
circuit card that, with its associated software and/or
microcode, enables the device to communicate over the
network.

address. (1) In data communication, the
IEEE-assigned unique code or the unique locally
administered code assigned to each device or
workstation connected to a network. (2) To refer to a
device or an item of data by its address (A).

address mask. For internet subnetworking, a 32-bit
mask used to identify the subnetwork address bits in the
host portion of an IP address. Synonymous with

subnet

mask and subnetwork mask.

Address Resolution Protocol (ARP). A protocol for
converting a higher level protocol address (for example,
an IP address) into a physical network address (for
example, an ATM address).

AFI. Authority and Format Identifier (1 byte) in an ATM
address.

AIX. Advanced Interactive Executive.

alert. (1) For IBM LAN management products, a
notification indicating a possible security violation, a
persistent error condition, or an interruption or potential
interruption in the flow of data around the network. In
SNA, a record sent to a system problem management
focal point to communicate the existence of an alert
condition. In the NetView for AIX program, a
high-priority event that warrants immediate attention.
This database record is generated for certain event
types that are defined by user-constructed filters.

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