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`INTERACTIVE
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`IEEE 100
`The Authoritative Dictionary of
`IEEE Standards Terms
`
`Seventh Edition
`
`Published by
`Standards Information Network
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`INTERACTIVE
`
`Trademarks and disclaimers
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`39210 IEEE Dictionary IEEES
`
`disk array
`
`323
`
`BATCH
`
`display
`
`disk array Multiple disks arranged in such a manner as to in-
`crease storage capacity or to provide redundant data for di-
`saster recovery. See also: RAID storage.
`
`(C) 610.10-1994w
`disk cache A cache consisting of random-access memory, used
`by a disk driver as intermediate storage between a rotating
`disk and main storage. Note: The disk cache minimizes access
`to the rotating disk by storing recently-used data or adjacent
`data in the random-access memory.
`(C) 610.10-1994w
`disk cartridge An assembly of one or more magnetic disks that
`is removable from the disk drive, but which cannot be sepa-
`rated from its associated container. Contrast: disk pack. See
`also: removable storage.
`(C) 610.10-1994w
`disk crash The sudden and complete failure of a disk drive. See
`also: head crash.
`(C) 610.10-1994w
`disk drive An electromechanical device that reads from and
`writes to disks. Contrast: tape drive. See also: disk storage
`device; magnetic disk drive; WORM drive; head-per-track
`disk drive; disk pack; full-height disk drive; half-height disk
`drive.
`(C) 610.10-1994w
`disk driver A device driver that supports a specific class of disk
`drives.
`(C) 610.10-1994w
`diskette A magnetic disk enclosed in a protective container. See
`also: floppy diskette; double-sided disk; disk.
`(C) 610.10-1994w
`diskette compatibility The ability of a diskette to be accessed
`by one or more systems such that data exchange can take
`place.
`(C) 610.2-1987
`disk file A file, typically containing data, residing on a magnetic
`or optical disk.
`(C) 610.10-1994w
`disk label Contains descriptive information, usually in a well-
`known location such as physical block zero, about the device
`and the media and may include logical partitioning informa-
`tion.
`(C/BA) 1275-1994
`diskless workstation A workstation with no storage capacity,
`intended to be used in conjunction with another workstation
`networked in such a way that the two workstations can share
`the storage.
`(C) 610.10-1994w
`disk mirroring See: double storage.
`disk pack An assembly of one or more magnetic disks that is
`removable from the disk drive together with its container,
`however the disks must be separated from the container when
`they are in use. Contrast: disk cartridge. See also: volume.
`(C) 610.10-1994w
`disk recorder (phonograph techniques) A mechanical re-
`corder in which the recording medium has the geometry of a
`disk. See also: phonograph pickup.
`(SP) [32]
`disk server On a network, a server that allows access to a disk
`storage device at the disk sector level; that is, the server sends
`absolute disk sectors to the requestor. See also: database
`server; print server; mail server; file server; terminal server;
`network server.
`(C) 610.7-1995
`disk storage device See: disk drive.
`dismiss To remove a menu or popup window from the screen.
`(C) 1295-1993w
`disparity The difference between the number of logical 1s and
`logical 0s in a character. A positive or negative disparity in-
`dicates an excess of 1s or 0s, respectively.
`(C/BA) 1355-1995
`dispatch Issue a fetched instruction to one or more functional
`units for execution.
`(C/MM) 1754-1994
`dispatcher The software that implements the service interface
`functions using workspace interface functions.
`(C/PA) 1328-1993w, 1327-1993w
`dispatching system (mining practice) A system employing ra-
`dio, telephone, and/or signals (audible or light) for orderly
`and efficient control of the movements of trains of cars in
`mines. See also: mine radio telephone system; mine-fan sig-
`nal system.
`(PE/EEC) [119]
`Dispatch List A DMA model where the DMA queues are linked
`lists of dispatch㛮items. Each dispatch㛮item contains a pointer
`
`to the next dispatch㛮item and a message being passed to the
`consumer.
`(C/MM) 1212.1-1993
`dispatch operation (radio-communication circuit) A method
`for permitting a maximum number of terminal devices to have
`access to the same two-way radio communication circuit. See
`also: channel spacing.
`(VT) [37]
`dispenser cathode (electron tube) A cathode that is not coated
`but is continuously supplied with suitable emission material
`from a separate element associated with it. See also: electron
`tube.
`(Std100) [84]
`dispersed data processing (DDP) See: distributed data
`processing.
`dispersed magnetic power tape See: magnetic-powder-im-
`pregnated tape.
`dispersed power An electric power generation source (or
`sources) not directly under established electric utility own-
`ership and control.
`(SUB/PE) 1109-1990w
`dispersion (1) The property of a planar transmission line
`whereby the phase velocity of the mode of propagation is
`frequency dependent, or equivalently, the phase constant is
`not proportional to frequency.
`(MTT) 1004-1987w
`(2) (of a wave) The variation of the phase velocity with fre-
`quency.
`(AP/PROP) 211-1997
`dispersion relation The functional relationship between the an-
`៝k
`gular frequency, ␻, and the wave vector,
`, for waves in a
`source-free medium. For a dispersionless medium, the com-
`៝k
`are linearly proportional to ␻.
`ponents of
`(AP/PROP) 211-1997
`dispersion slope The rate of change of the chromatic dispersion
`of a fiber with wavelength.
`(C/LM) 802.3-1998
`dispersive bandwidth (1) The operating frequency range over
`which the delay dispersion is defined (dispersive delay line).
`Synonyms: dispersive bandwidth; frequency selective band-
`width.
`(UFFC) 1037-1992w, [22]
`(2) See also: frequency selective bandwidth.
`(AP/PROP) 211-1997
`dispersive delay line A delay line which has a transfer char-
`acteristic with a constant modulus and an argument (phase)
`which is a nonlinear function of frequency. The phase char-
`acteristic of devices of common interest is a quadratic func-
`tion of frequency, but in general may be represented by higher
`order polynominals and/or other nonlinear functions.
`(UFFC) [22]
`dispersive Doppler frequency See: differential Doppler
`frequency.
`dispersive medium A medium in which one or more of the
`constitutive parameters vary with frequency. Note: As a re-
`sult, the phase velocity of propagating waves in a dispersive
`medium depends on frequency.
`(AP/PROP) 211-1997
`displaced phase center antenna (DPCA) An antenna and sig-
`nal processing method used in airborne moving-target indi-
`cation (AMTI) radar to compensate for the spread of the clut-
`ter Doppler spectrum caused by platform motion. Note: An
`example of a popular DPCA method is to employ two
`squinted antenna beams, take their sum and their difference
`on each of two successive pulses, and combine them in such
`a manner that the radar antenna appears to be stationary from
`pulse to pulse (a stationary antenna does not cause widening
`of the clutter spectrum). See also: space-time adaptive pro-
`cessing; airborne moving-target indication radar.
`(AES) 686-1997
`displacement current The time rate of change of the electric
`flux density.
`(AP/PROP) 211-1997
`display (1) (A) To present data visually. (B) The result of a
`display process. See also: copy.
`(C/Std100) 610.2-1987
`(2) (navigation aid terms) The visual representation of out-
`put data.
`(AES/RS/GCS) 686-1990, 172-1983w
`(3) (watthour meters) A means for visually identifying and
`presenting measured or calculated quantities and other infor-
`mation.
`(ELM) C12.15-1990, C12.13-1985s
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`
`39210 IEEE Dictionary IEEES
`
`f[nT ⫺ (1 ⫺ m)T]u[nT ⫺ (1 ⫺ m)T]z
`⫺n
`
`冘n
`
`⬁
`
`⫽0
`
`modify
`
`F(z, m) ⫽
`
`0 ⬍ m ⬍ 1
`
`(IM) [52]
`modify (A) To change the contents of a database. (B) To change
`the logical structure of a database. See also: alter.
`(C) 610.5-1990
`
`Modula 2 See: MODUlar LAnguage II.
`MODULA II See: MODUlar LAnguage II.
`modular (software) Composed of discrete parts. See also: mod-
`ular decomposition; modular programming.
`(C) 610.12-1990
`modular assembly A circuit breaker element consisting of
`sealed interrupters, mechanism, and connecting terminals.
`(SWG/PE) C37.59-1996
`modular constraint See: grid constraint.
`modular decomposition (software) The process of breaking a
`system into components to facilitate design and development;
`an element of modular programming. Synonym: modulariza-
`tion. See also: factoring; hierarchical decomposition; demo-
`dularization; cohesion; coupling; packaging;
`functional
`decomposition.
`(C) 610.12-1990
`modularity (software) The degree to which a system or com-
`puter program is composed of discrete components such that
`a change to one component has minimal impact on other com-
`ponents. See also: cohesion; coupling.
`(C) 610.12-1990
`modularization See: modular decomposition.
`MODUlar LAnguage II (MODULA II) A programming lan-
`guage developed, as an expanded version of Pascal, to support
`modular design, structured programs, and mathematical cal-
`culations. See also: block-structured language.
`(C) 610.13-1993w
`modular programming (software) A software development
`technique in which software is developed as a collection of
`modules. See also: stepwise refinement; data structure-cen-
`tered design; transaction analysis; rapid prototyping; modular
`decomposition;
`input-process-output;
`structured design;
`transform analysis; object-oriented design.
`
`(C) 610.12-1990
`
`MODULAR II See: MODUlar LAnguage II.
`modulate (A) To convert voice or data signal for transmission
`over a communications network. Contrast: demodulate.
`(B) To vary one or more attributes of a carrier (amplitude,
`frequency, phase) such that the frequency information in the
`modulating signal can be recovered by its inverse process.
`(C) 610.7-1995
`modulated 12.5T pulse (linear waveform distortion) A burst
`of color subcarrier frequency of nominally 3.58 MHz. The
`envelope of the burst is sin2 shaped with a HAD of nominally
`1.56 ␮s. The MOD 12.5T pulse consists of a luminance and
`a chrominance component. The envelope of the frequency
`spectrum consists of two parts, namely signal energy concen-
`trated in the luminance region below 0.6 MHz and in the
`chrominance region from roughly 3 MHz to 4.2 MHz.
`
`3.58 MHz
`BURST
`
`HAD
`
`1.56 S
`␮
`12.5T
`
`Envelope of frequency spectrum of modulated 12.5T pulse
`modulated 12.5T pulse
`
`(BT) 511-1979w
`
`703
`
`BATCH
`
`module
`
`modulation (1) (A) (data transmission) (Carrier). (i) The pro-
`cess by which some characteristic of a carrier is varied in
`accordance with a modulating wave. (ii) The variation of
`some characteristic of a carrier. See also: angle modulation;
`modulation index. (B) (data transmission) (Signal transmis-
`sion system). (i) A process whereby certain characteristics of
`a wave, often called the carrier, are varied or selected in ac-
`cordance with a modulating function. (ii) The result of such
`a process. See also: angle modulation; modulation index.
`(PE) 599-1985
`(2) (diode-type camera tube) The ratio of the difference be-
`tween the maximum and minimum signal currents divided by
`the sum. To avoid ambiguity, the optical input image intensity
`shall be assumed to be sinusoidal in the direction of scan.
`(ED) 503-1978w
`(3) (fiber optics) A controlled variation with time of any
`property of a wave for the purpose of transferring informa-
`tion.
`(Std100) 812-1984w
`(4) (overhead-power-line corona and radio noise) The pro-
`cess by which some characteristic of a carrier is varied in
`accordance with a modulating signal.
`(T&D/PE) 539-1990
`(5) (broadband local area networks) The method whereby
`information is superimposed onto a RF carrier to transport
`signals through a communications channel.
`(LM/C) 802.7-1989r
`(6) The process of changing or regulating the characteristics
`of a carrier that is vibrating at a certain amplitude and fre-
`quency so that the variations represent meaningful informa-
`tion. Contrast: demodulation.
`(C) 610.7-1995
`modulation contrast (diode-type camera tube) The ratio of
`the difference between the peak and the minimum values of
`irradiance to the sum of the peak and the minimum value of
`irradiance of an image or specified portion of an image.
`(ED) 503-1978w
`modulation index (angle modulation with a sinusoidal mod-
`ulating function) (data transmission) The ratio of the fre-
`quency deviation of the modulated wave to the frequency of
`the modulating function. Note: The modulation index is nu-
`merically equal to the phase deviation expressed in radians.
`(PE) 599-1985w
`modulation threshold (illuminating engineering) In the case
`of a square wave or sine wave grating, manipulation of lu-
`minance differences can be specified in terms of modulation
`and the threshold may be called the modulation threshold.
`L ⫺ L
`max
`L ⫹ L
`max
`min
`Periodic patterns that are not sine wave can be specified in
`terms of the modulation of the fundamental sine wave com-
`ponent. The number of periods or cycles per degree of visual
`angle represents the spatial frequency.
`(EEC/IE) [126]
`modulator A device that converts a signal into a modulated
`signal that is suitable for transmission.
`(C) 610.7-1995
`modulation transfer function (diode-type camera tube)
`Ro(N), the modulus of the optical transfer function (OTF), is
`synonymous with the sine amplitude response. That is, the
`response of the imaging sensor to sinewave images. When
`the modulation transfer functions or MTFs of a linear sensor’s
`components are known, the overall system MTF can be found
`by multiplying the individual component MTFs together.
`(ED) 503-1978w
`
`modulation ⫽
`
`min
`
`modulator-demodulator See: modem.
`module (1) (cable penetration fire stop qualification test) An
`opening in a fire resistive barrier so located and spaced from
`adjacent modules (openings) that its respective cable penetra-
`tion fire stop’s performance will not affect the performance
`of cable penetration fire stops in any adjacent module. A mod-
`ule may take on any shape to permit the passage of cables
`from one or any number of raceways.
`(ED) 581-1978w
`(2) (A) (software) A program unit that is discrete and iden-
`tifiable with respect to compiling, combining with other units,
`and loading; for example, the input to, or output from, an
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`39210 IEEE Dictionary IEEES
`
`module accelerated aging
`
`704
`
`BATCH
`
`module aging
`
`MTM-Bus
`
`MTM-Bus
`Interface
`Logic
`
`Module
`Application
`Logic
`
`An MTM-Bus module
`
`NOTE–An MTM-Bus module consists of MTM-Bus interface logic and module application logic.
`
`MTM-Bus module
`
`assembler, compiler, linkage editor, or executive routine.
`(B) (software) A logically separable part of a program. Note:
`The terms “module,” “component,” and “unit” are often used
`interchangeably or defined to be sub-elements of one another
`in different ways depending upon the context. The relation-
`ship of these terms is not yet standardized.
`
`(C) 610.12-1990
`(3) (STEbus) A plug-in unit consisting of one or more boards
`that contains at least one bus interface conforming to IEEE
`Std 1000-1987, which plugs into the backplane.
`(C/MM) 1000-1987r
`(4) (MULTIBUS) A basic functional unit within an agent.
`(C/MM) 1296-1987s
`(5) Collection of circuitry designed to perform specific func-
`tions that includes an interface to Futurebus⫹.
`(C/BA) 10857-1994, 896.4-1993w, 896.3-1993w
`(6) (NuBus) See also: board.
`(C/MM) 1196-1987w
`(7) A board or board set that comprises a single physical unit.
`It provides mechanical mounting and protection of electronic
`components, thermal transfer of heat away from the compo-
`nents to an external heat sink, and electrical and fiber-optic
`connections. A module is removable and replaceable.
`(BA/C) 14536-1995
`
`(8) A plug-in unit per IEC 50.
`(C/BA) 1101.4-1993, 1101.3-1993
`(9) A board, or board set, consisting of one or more nodes,
`that share a physical interface to SCI. If a module has multiple
`boards with backplane-mating connectors, it only uses one
`for the logical connection to the node. The others may provide
`additional power or I/O for their associated boards, but other-
`wise merely pass the input link signals through to the output
`link to provide continuity in case the module is plugged into
`a ring-connected backplane.
`(C/MM) 1596-1992
`(10) Typically a board assembly and its associated mechani-
`cal parts, front panel, optional shields, etc., which contains
`everything required to occupy a slot in a mainframe. A mod-
`ule may occupy one or more slots.
`(C/MM) 1155-1992
`(11) A collection of circuitry that is designed to perform a
`specific operation. This is standard terminology for Future-
`bus⫹, while VME64 uses board synonymously.
`(C/BA) 1014.1-1994w
`(12) A board, or board set, consisting of one or more nodes
`that share a physical interface. Although only one board in a
`module connects to bus signals, each board connector could
`provide power from the bus.
`(C/MM) 1212-1991s
`(13) An electronic circuit assembly that connects to one or
`more slots on the backplane. It is removable from and re-
`placeable in a backplane assembly via connectors.
`(C/BA) 896.2-1991w
`(14) An addressable unit or interconnected set of units at-
`tached to the MTM-Bus and fully supporting the MTM-Bus
`protocols. The boundary of an MTM-Bus module may cor-
`respond to the physical partitioning of the system, but is not
`required to do so. For the purposes of this document, a module
`
`is comprised of an MTM-Bus interface and module applica-
`tion logic, as shown in the figure below.
`(TT/C) 1149.5-1995
`(15) (FASTBUS module) Any FASTBUS Device that can be
`housed in a FASTBUS crate, that can connect to a crate seg-
`ment and that conforms with the mandatory specifications for
`a FASTBUS module.
`(NID) 960-1993
`(16) A packaged functional hardware unit designed for use
`with other components.
`(C) 610.10-1994w
`(17) The smallest component of physical management; i.e., a
`replaceable device.
`(C/MM) 1394-1995
`(18) Multiple cells/units in a single assembly.
`(SB) 1188-1996
`(19) A board or board set consisting of one or more nodes
`that share a physical interface, although only one board in a
`module connects to bus signals. Each board connection could
`provide power from the bus.
`(C/BA) 1156.4-1997
`(20) Any assembly of interconnected components that con-
`stitutes an identifiable device, instrument, or piece of equip-
`ment. A module can be disconnected, removed as a unit, and
`replaced with a spare. It has definable performance charac-
`teristics that permit it to be tested as a unit. A module could
`be a card, a drawout circuit breaker, or other subassembly of
`a larger device, provided it meets the requirements of this
`definition.
`(PE/NP) 603-1998
`module accelerated aging (nuclear power generating station)
`(advanced life conditioning) The acceleration process de-
`signed to achieve an advanced life condition in a short period
`of time. It is the process of subjecting a module or component
`to stress conditions in accordance with known measurable
`physical or chemical laws of degradation in order to render
`its physical and electrical properties similar to those it would
`have at an advanced age operating under expected service
`conditions. In addition, when operations of a device are cy-
`clical, acceleration is achieved by subjecting the device to the
`number of cycles anticipated during its qualified life.
`(PE/NP) 381-1977w
`module accuracy (nuclear power generating station) Con-
`formity of a measurement value to an accepted standard value
`or true value. Note: For further information, see Process
`Measurement and Control Terminology SAMA PMC-20.1-
`1973.
`(PE/NP) 381-1977w
`module address (MA) (1) (FASTBUS acquisition and con-
`trol) The group of bits assigned in the device address field of
`a FASTBUS address which identifies the module on its seg-
`ment. The module address may partially overlap the group
`address.
`(NID) 960-1993
`(2) An eight-bit value uniquely identifying an MTM-Bus
`module.
`(TT/C) 1149.5-1995
`module aging (nuclear power generating station) (natural)
`The change with passage of time of physical chemical, or
`electrical properties of a component or module under design
`range operating conditions which may result in degradation
`of significant performance characteristics.
`(PE/NP) 381-1977w
`
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`39210 IEEE Dictionary IEEES
`
`nonsystematic jitter
`
`743
`
`BATCH
`
`normal clear
`
`Can be both read and changed by the system.
`(PE/SUB) 1379-1997
`nonvolatile storage (1) (test, measurement, and diagnostic
`equipment) A storage device which can retain information
`in the absence of power. Contrast to volatile storage.
`(MIL) [2]
`(2) A type of storage whose contents are not lost when power
`is lost. Contrast: volatile storage. See also: erasable storage;
`bubble memory.
`(C) 610.10-1994w
`no-op See: no-operation.
`no-operation (no-op) (1) (computers) An instruction that spe-
`cifically instructs the computer to do nothing, except to pro-
`ceed to the next instruction in sequence. Synonym: no-op.
`(C) [20], [85]
`(2) (software) A computer operation whose execution has no
`effect except to advance the instruction counter to the next
`instruction. Used to reserve space in a program or, if executed
`repeatedly, to wait for a given event. Often abbreviated no-
`op. Synonyms: no-op; do-nothing operation.
`(C) 610.12-1990
`
`no-op instruction See: dummy instruction.
`NOR (1) (mathematics of computing) A Boolean operator
`having the property that if P is a statement, Q is a statement,
`R is a statement, .
`.
`. , then the NOR of P,Q,R,.
`.
`. is true if
`and only if all statements are false. Note: P NOR Q is often
`represented by PpQ. Synonym: nondisjunction.
`
`P Q
`
`1000
`
`Q0101
`
`P0011
`
`NOR truth table
`
`(C) 1084-1986w
`(2) (software) See also: notice of revision.
`(C) 610.12-1990
`
`NOR element See: NOR gate.
`NOR gate A gate that performs the Boolean operation of non-
`disjunction. Synonyms: inclusive NOR gate; NOR element;
`NOT-OR. See also: OR gate.
`(C) 610.10-1994w
`norator A two-terminal ideal element the current through which
`and the voltage across which can each be arbitrary.
`(CAS) [13]
`normal (1) (state of a superconductor) The state of a super-
`conductor in which it does not exhibit superconductivity. Ex-
`ample: Lead is normal at temperatures above a critical tem-
`perature. See also: superconductivity; superconducting.
`(ED) [46]
`
`(2) (power generation) See also: preferred.
`(3) See also: interference, normal-mode; normal-mode inter-
`ference.
`(SUB/PE) C37.1-1994
`normal base current Rated current of a transformer corre-
`sponding to its rated voltage and rated base kilovoltamperes.
`(PE/TR) C57.109-1993
`normal base power transfers (power operations) Those
`power transfers that are considered to be a part of normal
`base system loadings for the condition being analyzed. Other
`transfers, such as emergency power or opportunistic economy
`energy transfers, are excluded even though they may be pro-
`vided for in contractual arrangements.
`
`(PE/PSE) 858-1987s
`
`normal binary See: binary.
`normal character (N㛮char) N㛮chars represent, at the mini-
`mum, the 256 values of a byte (i.e., all the data characters)
`representing an end㛮of㛮packet
`plus a control character
`marker.
`(C/BA) 1355-1995
`normal clear A term used to express the normal indication of
`the signals in an automatic block system in which an indi-
`cation to proceed is displayed except when the block is oc-
`cupied. See also: centralized traffic-control system.
`(EEC/PE) [119]
`
`character. In telegraphy, this group is a character.
`(PE) 599-1985w
`
`nonsystematic jitter See: uncorrelated jitter.
`nonterminal node (data management) In a tree, a node that
`can have one or more subtrees. Synonyms: branch node; in-
`ternal node. Contrast: terminal node. See also: root node.
`(C) 610.5-1990w
`no-test trunk access method Used to connect to an end user’s
`line, the no-test trunk access method contains a direct metallic
`path and is primarily used for loop and customer premise
`equipment (CPE) testing purposes.
`(SCC31) 1390.3-1999
`nonthermal fire hazard A hazard resulting from combustion
`products (such as smoke and toxic and corrosive fire prod-
`ucts).
`(DEI) 1221-1993w
`nontouching loop set (network analysis) A set of loops no two
`of which have a common node.
`(CAS) 155-1960w
`nontransitive dependency A type of dependency among attrib-
`utes in a relation, in which a nonprime attribute A is said to
`be nontransitively dependent on another attribute B if and
`only if A is dependent on B, and there is another attribute C
`that is functionally dependent on B but does not functionally
`determine A. Contrast: transitive dependency.
`(C) 610.5-1990w
`nonuniformity (transmission lines and waveguides) The de-
`gree with which a characteristic quantity, for example, im-
`pedance, deviates from a constant value along a given path.
`Note: It may be defined as the maximum amount of deviation
`from a selected nominal value. For example, the nonuniform-
`ity of the characteristic impedance of a slotted coaxial line
`may be 0.05 ohm due to dimensional variations.
`(IM/HFIM) [40]
`non-utility generator A facility for generating electricity that
`is not exclusively owned by an electric utility and that oper-
`ates connected to an electric utility system.
`(PE/PSE) 858-1993w
`nonvented fuse (or fuse unit) A fuse without intentional pro-
`vision for the escape of arc gases, liquids, or solid particles
`to the atmosphere during circuit interruption.
`(SWG/PE) C37.40-1993, C37.100-1992
`nonvented power fuse (installations and equipment operating
`at over 600 volts, nominal) A fuse without intentional pro-
`vision for the escape of arc gases, liquids, or solid particles
`to the atmosphere during circuit interruption.
`(NESC/NEC) [86]
`nonventilated (power and distribution transformers) So con-
`structed as to provide no intentional circulation of external
`air through the enclosure.
`(PE/TR) C57.12.80-1978r
`nonventilated dry-type transformer (power and distribution
`transformers) (dry-type general purpose distribution and
`power transformers) A dry-type transformer which is so
`constructed as to provide no intentional circulation of external
`air through the transformer, and operating at zero gauge pres-
`sure.
`(PE/TR) C57.94-1982r, C57.12.80-1978r
`nonventilated enclosure An enclosure so constructed as to pro-
`vide no intentional circulation of external air through the en-
`closure. Note: Doors or removable covers are usually gas-
`keted and humidity control may be provided by filtered
`breathers.
`(SWG/PE) C37.100-1992, C37.23-1987r
`nonvolatile memory (1) A memory in which the data content
`is retained when power is no longer supplied to it.
`(ED) 641-1987w, 1005-1998
`(2) Memory whose contents are retained after power has been
`shut off.
`(C/BA) 14536-1995
`(3) Computer memory whose contents are preserved when the
`system power is off.
`(C/BA) 1275-1994
`(4) Memory that retains its contents even through power fail-
`ures.
`(C/MM) 1596-1992
`(5) Read/write storage that is preserved through losses of
`power.
`(C/MM) 1212-1991s
`nonvolatile random-access memory (NVRAM) A semi-per-
`manent type of data storage (memory) that is backed up by
`batteries to maintain stored data even if system power is lost.
`
`Authorized licensed use limited to: United States Patent and Trademark Office. Downloaded on September 20,2015 at 14:00:28 UTC from IEEE Xplore. Restrictions apply.
`
`

`
`39210 IEEE Dictionary IEEES
`
`segmental conductor
`
`1017
`
`BATCH
`
`selected slave
`
`(10) Zero or more contiguous elements of a string.
`(C/PA) 1328-1993w, 1224-1993w, 1327-1993w
`(11) The medium connection, including connectors, between
`Medium Dependent Interfaces (MDIs) in a CSMA/CD local
`area network.
`(C/LM) 802.3-1998
`(12) A portion of an interconnect structure treated as a unit
`for the purposes of extracting or estimating its electrical prop-
`erties. See also: parasitics.
`(C/DA) 1481-1999
`segmental conductor A stranded conductor consisting of three
`or more stranded conducting elements, each element having
`approximately the shape of the sector of a circle, assembled
`to give a substantially circular cross section. The sectors are
`usually lightly insulated from each other and, in service, are
`connected in parallel. Note: This type of conductor is known
`as type-M conductor in Canada. See also: conductor.
`(EEC/AWM) [91]
`segmental-rim rotor (rotating machinery) A rotor in which
`the rim is composed of interleaved segmental plates bolted
`together. See also: rotor.
`(IA/APP) [90]
`segmentation (1) The function in the DQDB Layer that frag-
`ments a variable length Initial MAC Protocol Data Unit
`(IMPDU) into fixed-length segmentation units for transfer in
`Derived MAC Protocol Data Units (DMPDUs) (cf., reassem-
`bly).
`(LM/C) 8802-6-1994
`(2) (image processing and pattern recognition) See also:
`image segmentation.
`(C) 610.4-1990w
`segmentation unit The fixed-length data units of 44 octets
`formed by the fragmentation of an Initial MAC Protocol Data
`Unit (IMPDU).
`(LM/C) 8802-6-1994
`segment attribute A characteristic that applies to a segment.
`For example, detectability, highlighting, priority, transfor-
`mation, visibility.
`(C) 610.6-1991w
`segment, cable See: cable segment.
`segment, crate See: crate segment.
`Segment Delay Value (SDV) A number associated with a given
`segment that represents the delay on that segment including
`repeaters and end stations, if present, used to assess path de-
`lays for 10 Mb/s CSMA/CD networks.
`(C/LM) 802.3-1998, 802.9a-1995w
`segment, extended See: extended segment.
`segment extender (SE) (FASTBUS acquisition and control)
`A device for connecting two segments to form an extended
`segment or part of an extended segment.
`(NID) 960-1993
`segment header The protocol control information in a segment.
`(LM/C) 8802-6-1994
`segmenting A technique used in memory mapping whereby the
`address space is broken into several various-size blocks;
`physical addresses are obtained by biasing each of the indi-
`vidual segments.
`(C) 610.10-1994w
`segment interconnect (SI) A device that implements an inter-
`segment connection such that the FBP on the two segments
`is synchronized. When an operation is passing through an SI,
`the SI acts as a slave on the near-side and as a master on the
`far-side.
`(NID) 960-1993
`segment interconnect, active See: active segment interconnect.
`segment
`interconnect, reserved See:
`reserved segment
`interconnect.
`segment number A four-character number identifying the sub-
`section of the ADC used for the data. Leading spaces are
`interpreted as leading zeros. This will be used in a system
`where the ADC is shared by several data inputs and is mul-
`tipl