IBM SC30-3681-08 manual Glossary, 691

Glossary

This glossary includes terms and de®nitions from:

vThe American National Standard Dictionary for Information Systems , ANSI X3.172-1990, copyright 1990 by the American National Standards Institute (ANSI). Copies may be purchased from the American National Standards Institute, 11 West 42nd Street, New York, New York 10036. De®nitions are identi®ed by the symbol (A) after the de®nition.

vThe ANSI/EIA StandardÐ440-A, Fiber Optic Terminology Copies may be purchased from the Electronic Industries Association, 2001 Pennsylvania Avenue, N.W., Washington, DC 20006. De®nitions are identi®ed by the symbol

(E)after the de®nition.

vThe 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). De®nitions of published parts of this vocabulary are identi®ed by the symbol (I) after the de®nition; de®nitions taken from draft international standards, committee drafts, and working papers being developed by ISO/IEC JTC1/SC1 are identi®ed by the symbol (T) after the de®nition, indicating that ®nal agreement has not yet been reached among the participating National Bodies of SC1.

vThe IBM Dictionary of Computing , New York: McGraw-Hill, 1994.

vInternet Request for Comments: 1208, Glossary of Networking Terms

vInternet Request for Comments: 1392, Internet Users' Glossary

vThe Object-Oriented Interface Design: IBM Common User Access Guidelines , Carmel, Indiana: Que, 1992.

The following cross-references are used in this glossary:

Contrast with:

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

Synonym for:

This indicates that the term has the same meaning as a preferred term, which is de®ned in its proper place in the glossary.

Synonymous with:

This is a backward reference from a de®ned term to all other terms that have the same meaning.

See: This refers the reader to multiple-word terms that have the same last word.

See also:

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

A

AAL. ATM Adaptation Layer, the layer that adapts user data to/from the ATM network by adding/removing headers and segmenting/reassembling the data into/from cells.

AAL-5.ATM Adaptation Layer 5, one of several standard AALs. AAL-5 was designed for data communications, and is used by LAN Emulation and Classical IP.

abstract syntax. A data speci®cation that includes all distinctions that are needed in data transmissions, but that omits (abstracts) other details such as those that depend on speci®c computer architectures. See also abstract syntax notation 1 (ASN.1) and basic encoding rules (BER).

abstract syntax notation 1 (ASN.1). The Open Systems Interconnection (OSI) method for abstract syntax speci®ed in the following standards:

vITU-T Recommendation X.208 (1988) ISO/IEC 8824: 1990

vITU-T Recommendation X.680 (1994) ISO/IEC 8824-1: 1994

See also basic encoding rules (BER).

ACCESS. In the Simple Network Management Protocol (SNMP), the clause in a Management Information Base (MIB) module that de®nes the minimum level of support that a managed node provides for an object.

acknowledgment. (1) The transmission, by a receiver, of acknowledge characters as an affirmative response to a sender. (T) (2) An indication that an item sent was received.

active. (1) Operational. (2) Pertaining to a node or device that is connected or is available for connection to another node or device.

active monitor. In a token-ring network, a function performed at any one time by one ring station that

© Copyright IBM Corp. 1994, 1998 691