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`39210 IEEE Dictionary IEEES
`
`chrominance channel bandwidth
`
`168
`
`BATCH
`
`circuit
`
`chrominance channel bandwidth (color television) The band-
`width of the path intended to carry the chrominance signal.
`(BT/AV) 201-1979w
`chrominance components See: chrominance.
`chrominance demodulator (color television) A demodulator
`used for deriving video-frequency chrominance components
`from the chrominance signal and a sine wave of chrominance
`subcarrier frequency.
`(BT/AV) 201-1979w
`chrominance modulator (color television) A modulator used
`for generating the chrominance signal from the video-fre-
`quency chrominance components and the chrominance sub-
`carrier.
`(BT/AV) 201-1979w
`chrominance primary (color television) A transmission pri-
`mary that is one of two whose amounts determine the chrom-
`inance of a color. Notes: 1. Chrominance primaries have zero
`luminance and are nonphysical. 2. This term is obsolete be-
`cause it is useful only in a linear system.
`(BT/AV) 201-1979w
`chrominance signal (color television) The sidebands of the
`modulated chrominance subcarrier that are added to the lu-
`minance signal to convey color information.
`(BT/AV) 201-1979w
`chrominance signal component (television) A signal resulting
`from suppressed-carrier modulation of a chrominance sub-
`carrier voltage at a specified phase, by a chrominance primary
`signal such as the I Video Signal or the Q Video Signal.
`(BT) 204-1961w
`chrominance subcarrier (color television) The carrier whose
`modulation sidebands are added to the luminance signal to
`convey color information.
`(BT/AV) 201-1979w
`chronaxie (medical electronics) The minimum duration of time
`required to stimulate with a current of twice the rheobase.
`(EMB) [47]
`chronic exposure Exposure over a relatively long time.
`(T&D/PE) 539-1990
`chronometer (navigation aids) A time piece with a nearly con-
`stant rate. Set approximately to Greenwich Mean Time.
`(AES/GCS) 172-1983w
`chunk A block of memory, typically 64 bits.
`
`(ED) 1005-1998
`
`chute See: feed tube.
`CI See: configuration item.
`CIE See: Commission Internationale de l’Eclairage.
`CIE (L*a*b*) uniform color space (illuminating engineer-
`ing) A transformation of CIE tristimulus values X, Y, Z into
`three coordinates that define a space in which equal distances
`are more nearly representative of equal magnitudes of per-
`ceived color difference. This space is specially useful in cases
`of colorant mixtures, for example, dye-stuffs, paints.
`(EEC/IE) [126]
`CIE (L*u*v*) uniform color space (illuminating engineer-
`ing) A transformation of CIE tristimulus values X, Y, Z into
`three coordinates that define a space in which equal distances
`are more nearly representative of equal magnitudes of per-
`ceived color difference. This space is specially useful in cases
`where colored lights are mixed additively for example, color
`television.
`(EEC/IE) [126]
`CIE standard chromaticity diagram (illuminating engineer-
`ing) One in which the x and y chromaticity coordinates are
`plotted in rectangular coordinates. Note: The diagram may be
`based on the CIE 1931 Standard Observer or on the CIE 1964
`Supplementary Standard Observer. See also: color matching
`functions.
`(EEC/IE) [126]
`CIE standard colorimetric observer, 1931 Receptor of radi-
`ation whose colorimetric characteristics correspond to the dis-
`␭,x y
`z
`
`␭,
`␭ adopted by the International
`tribution coefficients
`Commission on Illumination in 1931. See also: color.
`(BT/AV) [34], [84]
`CIGRE See: Confe´rence Internationale Des Grands Re´seaux
`Electriques.
`CIM See: computer
`manufacturing.
`
`input microfilm; computer-integrated
`
`CINEMA A hardware description language with a compiler
`written in BCPL; contains normal control statements and also
`statements providing parallel execution of program state-
`ments.
`(C) 610.13-1993w
`cine-oriented image In micrographics, an image appearing on
`a roll of microfilm in such a manner that the top edge of the
`image is perpendicular to the long edge of the film. Synonyms:
`portrait image; motion picture display. Contrast: comic-strip
`oriented image.
`(C) 610.2-1987
`C interface The C language binding, defined in terms of ISO/
`IEC 9899: 1990.
`(C/PA) 1328-1993w, 1327-1993w
`ciphertext Data produced through the use of encipherment, the
`semantic content of which is not available. Note: Ciphertext
`may itself be input to encipherment, producing superenci-
`phered data.
`(C/LM) 802.10-1998
`circadian rhythm Oscillation of biological processes with an
`approximate 24 h period regulated by external stimuli.
`(PE/T&D) 539-1990
`circle diagram (A) (rotating machinery) Circular locus de-
`scribing performance characteristics (current,
`impedance,
`etc.) of a machine or system. In case of rotating machinery,
`the term “circle diagram” has, in addition, some specific us-
`ages: The locus of the armature current phasor of an induction
`machine, or of some other type of asynchronous machine,
`displayed on the complex plane, with the shaft speed as the
`variable (parameter), when the machine operates at a constant
`voltage and at a constant frequency. (B) (rotating ma-
`chinery) The locus of the current vector(s) of a nonsalient-
`pole synchronous machine, displayed in a synchronously ro-
`tating reference frame (Park transform, d-q coordinates), with
`the active component of the load, hence with the rotor dis-
`placement angle, as the variable (parameter), when the ma-
`chine operates at a constant field current. (C) (rotating ma-
`chinery) The locus of the current phasor(s) of (2) See also:
`asynchronous machine.
`(PE) [9]
`circling guidance lights (illuminating engineering) Aeronau-
`tical ground lights provided to supply additional guidance
`during a circling approach when the circling guidance fur-
`nished by the approach and runway lights is inadequate.
`(EEC/IE) [126]
`circuit (1) (A) The physical medium on which signals are car-
`ried across the AUI. The data and control circuits consist of
`an A circuit and a B circuit forming a balanced transmission
`system so that the signal carried on the B circuit is the inverse
`of the signal carried on the A circuit. (B) (data transmission)
`A network providing one or more closed paths. (C) An ar-
`rangement of interconnected components that has at least one
`input and one output terminal, and whose purpose is to pro-
`duce at the output terminals a signal that is a function of the
`signal at the input terminals. Synonyms: physical circuit; net-
`work. See also: expansion board; channel; telecommunica-
`tion circuit. (D) An arrangement of interconnected electronic
`components that can perform specific functions upon appli-
`cation of proper voltages and signals. See also: logic circuit;
`integrated circuit.
`(LM/C/COM/PE/TA) 8802-3-1990, 455-1985, 599-1985,
`610.10-1994
`(2) A conductor or system of conductors through which an
`electric current is intended to flow.
`(NESC/PE) C2-1997, 599-1985w
`(3) (machine winding) The element of a winding that com-
`prises a group of series-connected coils. A single-phase wind-
`ing or one phase of a polyphase winding may comprise one
`circuit or several circuits connected in parallel.
`(PE) [9]
`(4) An interconnection of electrical elements. See also: net-
`work.
`(CAS) [13]
`(5) In networking, a means of communication of electrical or
`electronic signals between two points. Synonym: network. See
`also: telecommunication circuit; dial-up circuit; simplex cir-
`cuit; four-wire circuit; two-wire circuit; foreign exchange cir-
`cuit; leased circuit; channel.
`(C) 610.7-1995
`
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`39210 IEEE Dictionary IEEES
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`BATCH
`
`circuit analyzer
`
`169
`
`circuit controller
`
`(6) The physical medium on which signals are carried across
`the Attachment Unit Interface (AUI) for 10BASE-T or Media
`Independent Interface (MII) for 100BASE-T. For 10BASE-
`T, the data and control circuits consist of an A circuit and a
`B circuit forming a balanced transmission system so that the
`signal carrier on the B circuit is the inverse of the signal
`carried on the A circuit.
`(C/LM) 802.3-1998
`circuit analyzer (multimeter) The combination in a single en-
`closure of a plurality of instruments or instrument circuits for
`use in measuring two or more electrical quantities in a circuit.
`See also: instrument.
`(EEC/PE) [119]
`circuit, balanced See: balanced circuit.
`circuit board A flat piece of insulating material, often multi-
`layered, constituted of epoxy-glass or phenolic resin, on
`which electrical components are mounted and interconnected
`by etched copper foil so patterned as to form a circuit. Note:
`Sometimes referred to as a “board” or a “card.” See also:
`printed circuit board.
`(C) 610.10-1994w
`circuit bonding jumper The connection between portions of a
`conductor in a circuit to maintain required ampacity of the
`circuit.
`(NESC/NEC) [86]
`circuit breaker (1) (general) (thyristor) A device designed to
`open and close a circuit by nonautomatic means, and to open
`the circuit automatically on a predetermined overload of cur-
`rent, without injury to itself when properly applied within its
`rating. Notes: 1. A circuit breaker is usually intended to op-
`erate infrequently, although some types are suitable for fre-
`quent operation.
`(NESC/IA/IPC/PKG) 428-1981w, [86], 333-1980w
`(2) A switching device capable of making, carrying, and
`breaking currents under normal circuit conditions and also
`making, carrying for a specified time, and breaking currents
`under specified abnormal conditions such as those of short
`circuit.
`(NESC) C2-1997
`(3) (packaging machinery) An automatic device designed to
`open under abnormal conditions a current-carrying circuit
`without damage to itself.
`(IA/PKG) 333-1980w
`(4) (hydroelectric power plants) A fast-acting switching de-
`vice used to close and open an electric circuit and capable of
`interruption of fault currents.
`(PE/EDPG) 1020-1988r
`(5) A mechanical switching device, capable of making, car-
`rying, and breaking currents under normal circuit conditions
`and also, making and carrying for a specified time and break-
`ing currents under specified abnormal circuit conditions such
`as those of short circuit. Notes: 1. A circuit breaker is usually
`intended to operate infrequently, although some types are for
`frequent operation. 2. The medium in which circuit interrup-
`tion is performed may be designated by suitable prefix, that
`is, airblast circuit breaker, air circuit breaker, compressed-air
`circuit breaker, gas circuit breaker, oil circuit breaker, vac-
`uum circuit breaker, oilless circuit breaker, etc. 3. Circuit
`breakers are classified according to their application or char-
`acteristics and these classifications are designated by the fol-
`lowing modifying words or clauses delineating the several
`fields of application, or pertinent characteristics: High-voltage
`power— Rated above 1000 V ac. Molded-case— See sepa-
`rate definition. Low-voltage power— Rated 1000 V ac or be-
`low, or 300 V dc and below, but not including molded-case
`circuit breakers. Direct-current
`low-voltage power circuit
`breakers are subdivided according to their specified ability to
`limit fault-current magnitude by being called general purpose,
`high-speed, semi-high-speed, rectifier or anode. For specifi-
`cations of these restrictions see latest revision of the appli-
`cable standard.
`(SWG/PE) C37.100-1992
`circuit-breaker compartment (1) That portion of a switchgear
`assembly that contains one circuit breaker and the associated
`primary conductors and secondary control connection devices
`including current transformers.
`(SWG/PE) C37.20.1-1993r
`(2) That portion of the switchgear assembly that contains one
`circuit breaker or other removable primary interrupting device
`and the associated primary conductors.
`(SWG/PE) C37.20.2-1993
`
`circuit breaker downtime Time from the discovery of the fail-
`ure until the breaker is returned to service.
`(SWG/PE) C37.10-1995
`circuit breaker, field discharge A circuit breaker having main
`contacts for energizing and deenergizing the field of a gen-
`erator, motor, synchronous condenser, or rotating exciter, and
`having discharge contacts for short-circuiting the field
`through the discharge resistor at the instant preceding the
`opening of the circuit-breaker main contacts. The discharge
`contacts also disconnect the field from the discharge resistor
`at the instant following the closing of the main contacts. For
`direct-current generator operation, the discharge contacts may
`open before the main contacts close. Note: When used in the
`main field circuit of an alternating- or direct-current genera-
`tor, motor, or synchronous condenser, the circuit breaker is
`designated as a main field discharge circuit breaker. When
`used in the field circuit of the rotating exciter of the main
`machine, the circuit breaker is designated as an exciter field
`discharge circuit breaker. See also: field discharge circuit
`breaker.
`(SWG/PE) C37.100-1992, C37.18-1979r
`circuit breaker, general purpose low-voltage dc power A cir-
`cuit breaker that, during interruption, does not limit the cur-
`rent peak of the available (prospective) fault current and may
`not prevent the fault current from rising to its sustained value.
`(SWG/PE) C37.100-1992, C37.14-1999
`circuit-breaker grouping The three poles of a circuit breaker
`grouped in adjacent configuration along the line of the same
`row.
`(SWG/SUB/PE) C37.122-1983s, C37.100-1992
`circuit breaker, high-speed low-voltage dc power A circuit
`breaker that, during interruption, limits the current peak to a
`value less than the available (prospective) fault current.
`(SWG/PE) C37.100-1992, C37.14-1999
`circuit breaker interrupting rating For an unfused circuit
`breaker, the designated limit of available (prospective) cur-
`rent at which the circuit breaker is required to perform its
`short-circuit current duty cycle at rated maximum voltage un-
`der the prescribed test conditions. This current is expressed
`as the rms symmetrical value envelope at a time 1/2 cycle
`after short-circuit is initiated. (For dc breakers, the rated in-
`terrupting current is the maximum value of direct current.).
`(IA/MT) 45-1998
`circuit breaker, rectifier low-voltage dc power A circuit
`breaker that carries the normal current output of one rectifier
`and that, during fault conditions, functions to withstand and/
`or interrupt abnormal current as required.
`(SWG/PE) C37.100-1992, C37.14-1999
`circuit breaker, semi-high-speed low-voltage dc power A cir-
`cuit breaker that, during interruption, does not limit the cur-
`rent peak of the available (prospective) fault current on cir-
`cuits with minimal inductance but that does limit current to a
`value less than the sustained current available on higher-in-
`ductance circuits.
`
`(SWG/PE) C37.100-1992, C37.14-1999r
`circuit bypass means (bypass) An assembly of parts which,
`when properly operated, closes the circuit between the line
`and load jaws.
`(ELM) C12.7-1993
`circuit-commutated turn-off time (thyristor) The time inter-
`val between the instant when the principal current has de-
`creased to zero after external switching of the principal volt-
`age circuit and the instant when the thyristor is capable of
`supporting a specified principal voltage without turning on.
`See also: principal voltage-current characteristic.
`(IA/ED) 223-1966w, [46], [62], [12]
`circuit components (thyristor) Those electrical controller de-
`vices that may conduct current during some part of the cycle.
`Instrumentation is excluded. Note: This definition may in-
`clude devices within the controller that are used for the sup-
`pression of voltage and current transients.
`(IA/IPC) 428-1981w
`circuit controller A device for closing and opening electric
`circuits.
`(EEC/PE) [119]
`
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`BATCH
`
`MOBSSL-UAF
`
`700
`
`mode coupling
`
`alized mode shape at each natural frequency.
`(SWG/PE) C37.100-1992, C37.81-1989r
`modal point (transmission performance of telephone sets)
`The position of the center of the lips of a modal head. Also,
`the corresponding reference point of an artificial mouth, the
`center of the external plane of the lip ring.
`(COM/TA) 269-1983s
`modal position (transmission performance of telephone sets)
`The position a telephone-set handset assumes when the ear-
`cap of the handset is held in close contact with the ear of a
`modal head and the modal direction is in the plane defined
`by the axes of the transmitter cap and ear-cap.
`(COM/TA) 269-1983s
`mode (1) (radix-independent floating-point arithmetic) (bi-
`nary floating-point arithmetic) A variable that a user may
`set, sense, save, and restore to control the execution of sub-
`sequent arithmetic operations. The default mode is the mode
`that a program can assume to be in effect unless an explicitly
`contrary statement is included in either the program or its
`specification. The following mode is implemented: 1) Round-
`ing, to control the direction of rounding errors. 2) In certain
`implementations, rounding precision, to shorten the precision
`of results. 3) The implementor may, at his option, implement
`the following modes: traps disabled or enabled, to handle ex-
`ceptions.
`(MM/C) 854-1987r, 754-1985r
`(2) (electron tube) A state of a vibrating system to which
`corresponds one of the possible resonance frequencies (or
`propagation constants). Note: Not all dissipative systems have
`modes. See also: oscillatory circuit.
`(ED) 161-1971w, [45]
`(3) (fiber optics) In any cavity or transmission line, one of
`those electromagnetic field distributions that satisfies Max-
`well’s equations and the boundary conditions. The field pat-
`tern of a mode depends on the wavelength, refractive index,
`and cavity or waveguide geometry. See also: bound mode;
`linearly polarized mode; single mode optical waveguide;
`differential mode delay; unbound mode; multimode distor-
`tion; transverse magnetic mode; multimode optical wave-
`guide; transverse electric mode; hybrid mode; multimode
`laser; mode volume; equilibrium mode distribution; leaky
`mode; cladding mode; fundamental mode; equilibrium mode
`simulator; differential mode attenuation.
`(Std100) 812-1984w
`(4) (radio-wave propagation) A characteristic solution to the
`wave equation for specified boundary conditions. Other uses
`of the term mode are common. See also: mode of propaga-
`tion, ionospheric.
`(AP/PROP) 211-1990s
`(5) (mathematics of computing) A variable that a user may
`set, sense, save, and restore to control the execution of sub-
`sequent arithmetic operations.
`(C) 1084-1986w
`(6) An operating condition of a function, subfunction, or
`physical element of the system.
`(C/SE) 1220-1994s
`(7) A collection of attributes that specifies a file’s type and its
`access permissions. See also: file access permissions.
`(C/PA) 9945-1-1996, 9945-2-1993, 1003.5-1999
`(8) A set of related features or functional capabilities of a
`product, (e.g., on-line, off-line, and maintenance modes).
`(C/SE) 1362-1998
`mode conversion (waveguide) The transformation of an elec-
`tromagnetic wave from one mode of propagation to one or
`more other modes.
`(MTT) 146-1980w
`mode conversion gain (waveguide) The gain due to the con-
`version of power from one waveguide mode to another.
`(MTT) 146-1980w
`mode conversion loss (waveguide) The loss due to the con-
`version of power from one waveguide mode to another.
`(MTT) 146-1980w
`mode coupler (waveguides) A coupler that provides preferen-
`tial coupling to a specific wave mode. See also: waveguide.
`(IM/HFIM) [40]
`mode coupling (fiber optics) In an optical waveguide, the ex-
`change of power among modes. The exchange of power may
`reach statistical equilibrium after propagation over a finite
`
`as small (10⫺5 m2/Vs to 2 ⫻ 10⫺4 m2/Vs), medium (10⫺7 m2/
`Vs to 10⫺5 m2/Vs), and large (10⫺9 m2/Vs to 10⫺7 m2/Vs).
`(T&D/PE) 539-1990
`MOBSSL-UAF See: Merritt and Miller’s Own Block Struc-
`tured Simulation Language.
`mock-up A full-sized structural, but not necessarily functional,
`model built accurately to scale, used chiefly for study, testing,
`or display; for example, a full-sized model of an airplane
`displayed in a museum. See also: physical model.
`(C) 610.3-1989w
`
`mod See: modulo.
`modal A state in which the user has to complete the request of
`the mode before continuing.
`(C) 1295-1993w
`modal analysis (power-system communication) A method of
`computing the propagation of a wave on a multiconductor
`power line.
`(PE) 599-1985w
`modal channel (x-ray energy spectrometers) That channel in
`the distribution containing the largest number of counts.
`(NPS/NID) 759-1984r
`modal direction (transmission performance of telephone
`sets) The assumed direction of speech transmission on a mo-
`dal head. Also, the axis of an artificial mouth,.
`(COM/TA) 269-1983s
`modal distance (telephony) The distance between the center of
`the grid of a telephone-handset transmitter cap and the center
`of the lips of a human talker (or the reference point of an
`artificial mouth), when the handset is in the modal position.
`(COM/TA) 269-1971w
`modal head (transmission performance of telephone sets)
`Head dimensions that are modal for a human population. The
`modal head is the same as that adopted by the Comite´ Con-
`sultatif International Te´le´graphique et Te´le´phonique (CCITT)
`for the measurement of Affaiblissement e´quivalent pour net-
`tete´ (equivalent articulation loss). The applicable dimensions
`are shown in the correpsonding figure.
`
`LIP RING OF
`ARTIFICIAL MOUTH
`
`MODAL POINT OF
`ARTIFICIAL MOUTH
`
`(ALSO AXIS OF ARTIFICIAL MOUTH)
`
`MODAL DIRECTION
`
`34°
`54 IN
`
`REFERENCE
`POINT
`
`CENTER LINE
`OF EAR CAP
`
`1 3.6 C
`
`M
`
`PLANE OF EAR CAP AND EAR
`
`22°
`
`TYPICAL HANDSET
`IN COMMERCIAL USE
`
`17° 54 IN
`
`modal head
`
`(COM/TA) 269-1983s
`modal noise (fiber optics) Noise generated in an optical fiber
`system by the combination of mode dependent optical losses
`and fluctuation in the distribution of optical energy among the
`guided modes or in the relative phases of the guided modes.
`Synonym: speckle noise. See also: mode.
`(Std100) 812-1984w
`modal participation factor The magnitude of each structural
`mode (natural frequency) that participates to compose the fi-
`nal dynamic response of the system. Each participation factor
`is a function of the system mass distribution and the gener-
`
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`
`39210 IEEE Dictionary IEEES
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`two-way circuit
`
`1226
`
`BATCH
`
`Type EB
`
`type (1) A category into which attribute values are placed on
`the basis of their purpose.
`(C/PA) 1224-1993w
`(2) See also: class.
`(C/SE) 1320.2-1998
`Type A step-voltage regulator A step-voltage regulator in
`which the primary circuit is connected directly to the shunt
`winding of the regulator. The series winding is connected to
`the shunt winding and, in turn, via taps, to the regulated cir-
`cuit, per the figure below. In a Type A step-voltage regulator,
`the core excitation varies because the shunt winding is con-
`nected across the primary circuit.
`
`S
`
`“RAISE”
`DIRECTION
`
`L
`
`Schematic diagram of single-phase, Type A step-voltage
`regulator
`Type A step-voltage regulator
`(PE/TR) C57.15-1999
`type attributes The classification of each source statement as
`either executable, data declaration, compiler directive, or
`comment.
`(C/SE) 1045-1992
`type bar In a bar printer, a print element in the form of a bar
`that holds type slugs. Synonym: print bar.
`
`(C) 610.10-1994w
`Type B step-voltage regulator A step-voltage regulator in
`which the primary circuit is connected, via taps, to the series
`winding of the regulator. The series winding is connected to
`the shunt winding, which is connected directly to the regu-
`lated circuit, per the figure below. In a Type B step-voltage
`regulator, the core excitation is constant because the shunt
`winding is connected across the regulated circuit.
`
`S
`
`“RAISE”
`DIRECTION
`
`L
`
`Schematic diagram of single-phase, Type B step-voltage
`regulator
`Type B step-voltage regulator
`(PE/TR) C57.15-1999
`Type DB (1) (cable systems in power generating stations)
`(formerly Type II) Conduit designed for underground instal-
`lation without encasement in concrete.
`(C) 166-1977w
`(2) Duct designed for direct burial without encasement in
`concrete (also referred to as Type II duct), fabricated from
`PVC or ABS.
`(SUB/PE) 525-1992r
`Type EB (1) (cable systems in power generating stations)
`(formerly Type I) Conduit designed to be encased in concrete
`when installed.
`(C) 166-1977w
`(2) Duct designed to be encased in concrete when installed
`(also referred to as Type I duct), fabricated from PVC or ABS.
`(SUB/PE) 525-1992r
`
`Short
`Stand
`Long
`
`two-way circuit A circuit in which the transmission of signals
`is permitted in both directions. Contrast: simple circuit.
`(C) 610.10-1994w
`two-way correction A method of register control that effects a
`correction in register in either direction.
`(IA/ICTL/CEM) [58]
`two-way insertion sort An insertion sort in which each item in
`the set to be sorted is inserted in its proper position in the
`sorted set such that the first item is placed in the middle of
`the output set and space is made for subsequent items by
`moving the previously-inserted items to the right or left. Con-
`trast: binary insertion sort.
`(C) 610.5-1990w
`two-way merge sort A merge sort in which the set to be sorted
`is divided into two subsets, the items in each subset are sorted,
`and the subsets are merged by comparing the smallest items
`of each subset, outputting the smallest of those, then repeating
`the process. See also: natural two-way merge sort; multiway
`merge sort; straight two-way merge sort.
`(C) 610.5-1990w
`two-way simultaneous operation A mode of operation of a
`data link in which data may be transmitted over a link simul-
`taneously in both directions. See also: one-way-only opera-
`tion; two-way alternate operation.
`(C) 610.7-1995
`two-way trunk (telephone switching systems) A trunk be-
`tween two switching entities used for calls that originate from
`either end.
`(COM) 312-1977w
`two-wire channel (1) (data transmission) (two-wire circuit)
`A metallic circuit formed by two adjacent conductors insu-
`lated from each other. Note: Also used in contrast with four-
`wire circuit to indicate a circuit using one line or channel for
`transmission of electric waves in both directions.
`(PE) 599-1985w
`(2) (telephone loop performance) A transmission medium
`that simultaneously carries, without multiplexing, two signals
`traveling in opposite directions.
`(COM/TA) 820-1984r
`two-wire circuit (1) (data transmission) A metallic circuit
`formed by two adjacent conductors insulated from each other.
`Note: Also used in contrast with four-wire circuit to indicate
`a circuit using one line or channel for transmission of electric
`waves in both directions.
`(PE) 599-1985w
`(2) (transmission performance of telephone sets) A metal-
`lic circuit formed by two conductors insulated from each
`other. The electric waves are transmitted in both directions
`over the path provided by the two-wire circuit.
`(COM/TA) 269-1983s
`(3) A leased circuit in which two conductors are used, each
`for a one-way transmission path. See also: foreign exchange
`circuit; dial-up circuit; simplex circuit; four-wire circuit.
`(C) 610.7-1995
`(4) A circuit formed by a pair of conductors that are insulated
`from one another and that each feed a load in one direction
`at a time.
`(C) 610.10-1994w
`two-wire control A control function that utilizes a maintained-
`contact type of pilot device to provide undervoltage release.
`(See the corresponding figure.) See also: undervoltage re-
`lease; control.
`
`3 t
`
`wo-wire control
`
`M
`
`L2
`
`L1
`
`1
`
`(IA/ICTL/IAC) [60]
`two-wire repeater (data transmission) A telephone repeater
`that provides for transmission in both directions over a two-
`wire telephone circuit.
`(PE) 599-1985w
`two-wire switching (telephone switching systems) Switching
`using the same path, frequency, or time interval for both di-
`rections of transmission.
`(COM) 312-1977w
`two-wire system See: two-wire circuit.
`two-wire transmission A transmission scheme where the send
`and receive signals are carried in one pair of wires.
`(COM/TA) 269-1992, 1329-1999
`
`TWS See: track-while-scan.
`
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