I
`
`_.-7
`
`IEEE Std 100-1992
`
`The New %IEEE Standard Dictionary ’
`of Electrical and Electronics Terms
`
`F i
`
`1i
`
`f
`
`Fifth Edition
`Newly Revised and Expanded
`
`1 E 1
`
`‘a
`
`la
`1
`Bi
`Q;
`
`in
`
`_.i:
`
`1;__
`1
`1 fl;
`‘ti
`‘M
`
`2:
`
`Pubfishedbythe
`Institute 0
`Electrical
`Electronics
`
`Engineers,lnc.
`BROADCOM 1011
`-L ——»...,;
`
`""!|h»'.:~_fi.
`
`_,--
`
`

`
`IEEE Std 100-1992
`
`dard Dictionary
`The New IEEE Stan
`nd Electronics Terms
`of Electrical a
`of All Current IEEE Standards]
`[Including Abstracts
`
`F
`
`ifth Edition
`
`Gediminas P. Kurpis, Chair
`
`Christopher J. Booth, Editor
`
`

`
`nd Electronics Engineers, Inc.
`The Institute of Electrical a York. NY 10017-2394, USA
`345 East 47th Street, New
`
`Copyright © 1993 by the
`Institute of Electrical and Electronics Engineers, Inc.
`All rights reserved. Published 1993
`Printed in the United States of America
`
`ISBN 1—55937-240-0
`
`be reproduced in any form,
`No part of this publication may
`stem or otherwise,
`in an electronic retrieval sy
`ssion ofthe publisher.
`without the prior written permi
`
`January 15. 1993
`
`SH15594
`
`

`
`combination rubber tape
`
`214
`
`command
`
`combination rubber tape. The assembly of both
`rubber and friction tape into one tape that
`provides both insulation and mechanical
`protection for joints.
`(1 l9l
`combinations of pulses and waveforms (pulse
`terms). See: bipolar pulse; double pulse;
`staircase.
`combination starter (packaging machinery). A
`starter having manually operated disconnect-
`ing means built into the same enclosure with
`the magnetic contactor.
`333--l980w
`combination support
`(raceway systems for
`Class 1E circuits for nuclear power generat-
`ing stations]. A support
`that serves either
`raceways or different types of raceway(s] and
`other mechanical or electric systems such as
`heating.
`ventilating,
`and
`air—conditioning
`(HVAC) ducts. piping. and lighting fixtures.
`628- i 987
`
`combination thermoplastic tape. An adhesive
`tape composed of a thermoplastic compound
`that provides both insulation and mechanical
`protection for joints.
`(ll9l
`combination watch-report and fire-alarm sys-
`tem. A coded manual fire-alarm system,
`the
`stations of which are equipped to transmit a
`single watch—report signal or repeated fire-
`alarm signals. See: protective signaling. (119)
`combined-line-recording trunk (CLR)
`(tele-
`phone switching). A one-way trunk for opera-
`tor recording and extending of toll calls.
`3 12- 1 977w
`
`combined mechanical and electrical strength
`(insulator). The loading in pounds at which
`the insulator fails to perform its function either
`electrically
`or mechanically.
`voltage
`and
`mechanical
`stress being applied simulta-
`neously. Note: The value will depend upon the
`conditions under which the test is made. See:
`insulator; tower.
`(10;
`combined telephone set. A telephone set
`including in a single housing all the compo-
`nents required for a complete telephone set
`except the handset which it is arranged to sup-
`port. Note: Wall hand telephone sets are of this
`type. but the term is usually reserved for a self-
`contained desk telephone set to distinguish it
`from desk telephone sets requiring an associ-
`ated beli box. A desk 1ocal—battery telephone
`set may be referred to as a combined set if it
`includes in its mounting all components except
`its associated local batteries. See: telephone
`station.
`(1 19)
`combined uncertainty. The uncertainty result-
`ing from combining category A and category B
`uncertainties. as defined by the Bureau Inter-
`national des Poids et Mésures (BIPM), using
`standard statistical methods. Category A
`uncertainties are evaluated by applying statis-
`tical methods to a series of repeated measure-
`ments and are characterized by the estimated
`
`standard deviation. SA; category B uncertain-
`ties are assigned to quantities whose variation
`is not explicitly observed. Category B uncer-
`tainties are determined by estimating from
`other information an approximation to a corre-
`sponding “standard deviation.‘
`s3. whose
`existence is assumed. They are combined as if
`they are all standard deviations. N42. 14-1991
`combined voltage and current influence (watt-
`meter]. The percentage change (of full-scale
`value) in the indication of an instrument that
`is caused solely by a voltage and current
`departure from specified references while con-
`stant power at the selected scale point is main-
`tained. See: accuracy rating (instrument).[1021
`
`combustible materials (power and distribution
`transformer). Materials which are external to
`the apparatus and made of or surfaced with
`wood, compressed paper, plant fibers. or other
`materials that will ignite and support flame.
`C57.l2.80-i978
`
`[10l
`
`COM device. See: computer output micro-
`filmer.
`610.2-1987
`come-along. See: conductor grip.
`5 l6— 1987
`comic-strip oriented image.
`in micrographics,
`an image appearing on a roll of microfilm in
`such a manner that the top edge of the image
`is parallel to the long edge of the film. Contrast
`with: cine-oriented image. Syn:
`landscape
`image.
`6102-1987
`command (1) (logical
`link control).
`in data
`communications, an instruction represented in
`the control field of a protocol data unit (PDU)
`and transmitted by a logical link control (LLC).
`it causes the addressed LLC(s)
`to execute a
`specific data link control function.
`799-1987, 8802-2:l989
`(2) (electronic computation). (A) One of a set
`of several signals (or groups of signals) that
`occurs
`as
`a
`result
`of
`interpreting
`an
`instruction;
`the
`commands
`initiate
`the
`individual steps that
`form the process of
`executing the
`instructions
`operation.
`(B)
`Loosely: an instruction in machine language.
`(C) Loosely: a mathematical or logic operator.
`(D) Loosely: an operation.
`162-1963, [2]. [20], [851
`(industrial control). An input variable
`(3)
`established by means
`external
`to,
`and
`independent
`of,
`the
`feedback (automatic)
`control system. It sets. is equivalent to. and is
`expressed in the same units as the ideal value
`of
`the ultimately controlled variable. See:
`control system. feedback: set point.
`(Cam
`(4) (software). An expression that can be input
`to a computer system to initiate an action or
`affect the execution of a computer program; for
`
`

`
`command character
`
`215
`
`common carrier
`
`example, the “log on” command to initiate a
`computer session.
`610.12-1990
`command character. See: control character.
`6 1 0.5 - 1990
`
`command control (electric power system). An
`automatic generation control methodologr that
`reduces unit control error irrespective of area
`control error.
`94-1991
`command-driven. Pertaining to a system or
`mode of operation in which the user directs the
`system through commands. Contrast with:
`menu-driven.
`6 1 0.1 2- 1990
`
`command guidance (navigation aid terms).
`Guidance in which information transmitted to
`a craft from an outside source causes it
`to
`follow a prescribed path.
`172-1983
`command language (software). A language used
`to express commands to a computer system.
`See also: command-driven.
`6 1 0. 12-1990
`
`command link [communication satellite). A
`data transmission link (generally earth to
`spacecraft or satellite) used to command a
`satellite or spacecraft in space.
`(24)
`
`command PDU (protocol data unit) (logical
`link control). All PDU’s
`transmitted by a
`logical
`link control
`(LLC)
`in which the C/R
`(command/ response) bit is equal to “O.”
`799-1987. 8802-2:1989
`
`command rate (gyro). The input rate equivalent
`of a torquer command signal.
`528-1984w
`command reference (servo or control system)
`(power supplies). The voltage or current
`to
`which the feedback signal is compared. As an
`independent variable, the command reference
`exercises complete control over
`the system
`output. See: operational programming.
`[41]
`command transfer. The passing of command
`information over
`the system control signal
`group,
`from the bus owner to the replying
`agent(s). during the request phase of a transfer
`operation. Command information includes
`parameters
`for
`the
`impending
`transfer
`operation, as well as additional address space
`information not transmitted with the address
`transfer. See: system control signal group;
`request phase.
`1296-1987
`comment
`(software).
`Information embedded
`within a
`computer program.
`job control
`statements. or a set of data.
`that provides
`clarification to human readers but does not
`affect machine interpretation.
`61012-1990
`
`(A) One of the set of
`commercial character.
`characters used commonly in commercial
`operations;
`for example, CR (credit) and DB
`(debit).
`(B) A character within a picture
`specification
`that
`represents
`one
`of
`the
`characters as in (A).
`6105-1990
`
`commercial data processing [computer appli-
`cations). Data processing performed to sup-
`
`port a commercial organization or function.
`6 10.2-1987
`
`commercial grade part (replacement parts for
`Class
`IE equipment
`in nuclear power
`generating stations). A part that is:
`(A) not
`subject to design or specification requirements
`that are unique to nuclear power plants: (B)
`used in applications other than nuclear power
`plants;
`(C) ordered from the manufacturer/
`supplier on the basis of specifications set forth
`in the manufacturer's published product
`description (for example. a catalog). 934-1987
`commercial power (emergency and standby
`power). Power furnished by an electric power
`utility company: when available.
`it is usually
`the prime power
`source. However. when
`economically feasible,
`it sometimes serves as
`an alternative or standby source. Syn. utility
`power.
`446-1987
`residential.
`commercial,
`and institutional
`buildings. All buildings other than industrial
`buildings and residential dwellings. 241-1990
`commercial tank (electrorefining). An electro-
`lytic cell in which the cathode deposit is the
`ultimate electrolytically refined product. See:
`electroreflning.
`(1 19)
`
`commissioning tests (rotating machinery).
`Tests applied to a machine at site under nor-
`mal
`service
`conditions
`to show that
`the
`machine has been erected and connected in a
`correct manner and is able to work satisfacto-
`rily. See- asynchronous machine.
`[9]
`common. See: common storage.
`610 12-1990
`common area. See. common storage.
`6 10. 1 2- 1 990
`
`common-battery central offlce. See: common-
`battery office.
`
`common-battery office (telephone switching
`systems). A central
`office
`that
`supplies
`transmitter and signaling currents
`for
`its
`associated stations and current for the central
`office equipment from a power source located
`in the central office.
`312-1977w
`
`common battery signaling (data transmis-
`sion). A method of actuating a line or supervi-
`sory signal at the distant end of a telephone
`line by the closure of a direct—current (dc) cir-
`cuit with the exchange providing the feeding
`current.
`599- 1985w
`
`common-battery switchboard. A telephone
`switchboard
`for
`serving
`common-battery
`telephone sets.
`[48]
`common block. See: common storage.
`6 1 0. 1 2- 1 990
`
`In
`(data communication).
`common carrier
`telecommunications. a public utility company
`that is recognized by an appropriate regulatory
`agency as having a vested interest and respon-
`sibility in furnishing communication services