Copy of `Wave Corrector  Glossary of Cable Engineering Terms`
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Wave Corrector  Glossary of Cable Engineering Terms
Category: Sciences > Sound
Date & country: 15/11/2007, UK Words: 60

AttenuationThe reduction in amplitude of an electrical signal due to a transmission line or other network.
Attenuation coefficientThe factor relating transmission line Â attenuation to unit distance.
Attenuation UnbalanceA measure of the inequality of attenuation between two pairs in a multipair cable.
Balance about earthSee Common Mode Conversion Ratio.
Balanced pairA transmission line in which the two conductors are electrically identical and symmetrical with respect to a common reference point, usually earth.
BalunA transformer device used for matching balanced and unbalanced circuit elements.
CapacitanceA measure of the ability of two conductors to store electric charge.
Capacitance unbalanceA measure of the inequality of capacitance between the conductors of two adjacent pairs in a multipair cable.
Characteristic impedanceThe terminal impedance that a transmission line tends towards as its length tends to infinity.
Coaxial lineA transmission line in which one conductor is located at the centre Â of a metal tube which acts as the second conductor.
Common mode conversion ratioA measure of the balance of the two conductors of a pair with respect to earth.
ConductanceThe real (nonreactive) part of the admittance of a circuit, where admittance is the reciprocal of impedance.
Conducted interferenceInterference that occurs because of inductive or capacitive coupling.
Conductor lossesPower losses due to the resistance of conductors.
Copper lossesPower losses due to the resistance of copper conductors.
CrosstalkThe unwanted coupling of signals between different pairs in a cable.
Crosstalk attenuationSee Crosstalk Ratio.
Crosstalk distanceThe decibel difference between the level of a wanted signal on a transmission line and an unwanted signal caused by crosstalk.
Crosstalk ratioThe ratio of crosstalk signal level to the level of the originating source of the crosstalk.
DecibelA logarithmic unit used for expressing the ratio of two powers.
DielectricA material which acts as an electrical insulator.
Dielectric lossesPower losses due to the conductance of dielectric materials.
Eddy currentsCurrents induced by unwanted inductive coupling between adjacent conductors.
Electrical screenA metal shield which isolates a device from external fields.
Electromagnetic compatibilityThe capability of different electrical systems to coexist in the electromagnetic environment without causing or being subjected to interference.
Far end crosstalk ratioCrosstalk measured at the far end of a transmission line.
Far fieldThe electromagnetic field which exists at a distance of several wavelengths from the source of radiation.
ImpedanceThe complex ratio of voltage to current.
InductanceThe property of a conductor whereby a voltage is induced into it as a result of a changing current.
Insertion lossThe loss in power caused by the insertion of a network between a source and a load.
Longitudinal modeA propagation mode in which the two conductor of a pair act as a single conductor.
Mayer methodA method of evaluating the propagation delay of a transmission line.
Mismatch lossThe loss of power delivered into a load as a result of the interconnection of devices having unequal impedances
Near end crosstalk ratioCrosstalk measured at the transmit end of a transmission line.
Near fieldThe electromagnetic field that exists within one wavelength of a source of radiation.
NeperA logarithmic unit used for expressing the ratio of two voltages.
Network analyserA measuring instrument for evaluating the complex characteristics of linear electrical circuits.
Phase coefficientThe factor relating phase to distance.
Primary coefficientsThe factors relating distance to the basic electrical properties of transmission lines.
Propagation coefficientThe complex factor which resolves into the attenuation and phase coefficients of a transmission line.
Propagation delayThe time required for a signal to pass along a transmission line
Propagation velocityThe velocity of wave propagation along a transmission line.
Proximity effectThe redistribution of current in a conductor brought about by the proximity of another conductor.
QuadA series of four separately insulated conductors, generally twisted together.
Regularity return lossSee Structural Return Loss.
ResistanceThe real (nonreactive) part of the impedance of a circuit.
Resistance unbalanceA measure of the inequality of the resistance of the two conductors of a transmission line.
Return lossThe difference between the power incident upon a discontinuity in a transmission system and the power reflected from the discontinuity.
ScreeningSee Electrical Screen.
Screening attenuationThe decibel difference between the signal level present at the input of a device, and the radiated power originating from the device.
Secondary coefficientsAttenuation and phase coefficients and characteristic impedance of a transmission line.
SkewA measure of the inequality of propagation delay between two pairs in a multipair cable.
Skin effectThe tendency of alternating currents to increasingly flow nearer the surface of a conductor as frequency increases.
Structural return lossA measure of the uniformity of a transmission line's impedance.
Surface transfer impedanceThe ratio of the voltage developed across a transmission line to the current flowing on the outer surface of the screen.
Transmission lineA pair of conductors separated by a dielectric.
Transverse ModeA propagation mode in which the two conductor of a pair carry equal and opposite currents.
Twisted pairA transmission line in which two insulated conductors are twisted together.
Unbalanced pairA transmission line in which the voltages on the two conductors are unequal with respect to earth.
Velocity ratioThe ratio of propagation velocity to the speed of light.