Telecommunications terms starting with E

405 terms

E East
E & M signaling In telephony, an arrangement that uses separate leads, called the "E" lead and "M" lead, for signaling and supervisory purposes.
E layer See E region, ionosphere.
E REGION In solar-terrestrial terms, a daytime layer of the earth's ionosphere roughly between the altitudes of 85 and 140 km.
E-bend A smooth change in the direction of the axis of a waveguide, throughout which the axis remains in a plane parallel to the direction of electric E-field…
e-cash Abbreviation for electronic cash. Data representing money, which data can be transferred by means of a computer network and can be traded as a token…
e-Commerce electronic commerce
e-mail Electronic mail or computer-based mail
E-mail Address The address used to reach someone via email. The format of an email address is user@domain. For example, my email address is email.guide@about.
e-mail exploder Synonym mail exploder.
E-plane bend Synonym E-bend.
e-trade Synonym e-commerce.
e-zine Abbreviation for electronic magazine. A periodical publication that is stored on a file server and that may be distributed or accessed via a computer…
e.m.r.p. Abbreviation for effective monopole radiated power.
e.r.p. [or ERP] Abbreviation for effective radiated power.
earth See ground.
Earth coverage (EC) In satellite communications, the coverage that occurs when the satellite-to-Earth beam is sufficiently wide to cover all of the surface of the Earth…
earth electrode subsystem A network of electrically interconnected rods, plates, mats, or grids, installed and connected, for the purpose of establishing a low-resistance contact…
Earth exploration-satellite service A radiocommunication service between Earth stations and one or more space stations, which may include links between space stations, in which: information…
earth ground See ground.
Earth station A station located either on the Earth's surface or within the major portion of the Earth's atmosphere and intended for communication: with one or more…
Earth terminal In a satellite link, one of the non-orbiting communications stations that receives, processes, and transmits signals between itself and a satellite.
Earth terminal complex In satellite communications systems, the assembly of equipment and facilities necessary to integrate an Earth terminal into a communications network.
EAS Abbreviation for extended area service.
ease of use An aspect of the assessment of the effectiveness of a Target of Evaluation, namely that it cannot be configured or used in a manner which is insecure but…
Eavesdropping Surreptitiously obtaining data from an unknowing end user who is performing a legitimate function.
EBCDIC Extended Binary Code Decimal Interchange Code.
EbN0 See signal-to-noise ratio per bit.
EBS Emergency Broadcast System
EC See: Enzyme Commission number.
ECCM Electronic Counter-Countermeasures.
Echo Energy back scattered from a target (precipitation, clouds, etc.) and received by and displayed on a radar screen.
echo area See scattering cross section.
echo attenuation In a communication circuit (4- or 2-wire) in which the two directions of transmission can be separated from each other, the attenuation of echo signals…
echo canceler See echo suppressor.
echo cancellation In a system, the reduction of the power level of an echo or the elimination of an echo.
echo check A check to determine the integrity of transmission of data, whereby the received data are returned to the source for comparison with the originally…
echo command A programming language command that causes an echo response from a computer to be displayed on a monitor or printer for analysis or monitoring of the…
echo effect See ghost.
echo line In computer systems, on a hard-output or display device, a line of information that verifies (reflects) data entered into the computer.
echo loss The ratio in dB of the power of a transmitted signal that is echo loss weighted (as specified in ITU-T Recommendation G.
echo path capacity The maximum echo path delay for which an echo canceler is designed to operate. [T1.508-1998]
echo path delay (EPD) The time in milliseconds (ms) between the incidence of a signal and the incidence of that signal's echo at a measurement point. [T1.255-1997]
echo return loss See return loss.
echo sounding The measurement of the depth of a body of water or the distance to an object in a body of water by measuring the time it takes sound or electromagnetic…
echo suppression The procedure by which characters entered into a system are not physically revealed [CESG].
echo suppressor A device for connection to a two-way telephone circuit to attenuate echo signals in one direction caused by signals in the other direction.
echoplex An echo check used in public switched networks operating in the full-duplex transmission mode, i.e., the two-way-simultaneous mode.
ECM Enterprise content management.
edge busyness In a video display, distortion that is concentrated at or near the edge of objects, and that is categorized further by its temporal and spatial…
edge-emitting LED An LED that has a physical structure superficially resembling that of an injection laser diode, operated below the lasing threshold and emitting…
EDI See electronic data interchange (EDI).
EDTV Abbreviation for extended-definition television.
edu In a URL, a domain-name suffix indicating an education institution.
Effective 2-Wire The term "Effective 2-Wire" denotes a condition which permits the simultaneous transmission in both directions over a channel, but it is not possible to…
Effective 4-Wire The term "Effective 4-Wire" denotes a condition which permits the simultaneous independent transmission of information in both directions over a channel.
effective antenna gain contour (of a steerable satellite beam) An envelope of antenna gain contours resulting from moving the boresight of a steerable satellite beam along the limits of the effective boresight area.
effective boresight area (of a steerable satellite beam) An area on the surface of the Earth within which the boresight of a steerable satellite beam is pointed.
effective data transfer rate The average number of units of data, such as bits, characters, blocks, or frames, transferred per unit time from a source and accepted as valid by a sink.
Effective Date The date on which an insurance policy becomes effective.
effective Earth radius The radius of a hypothetical Earth for which the distance to the radio horizon, assuming rectilinear propagation, is the same as that for the actual Earth…
effective height The height of the center of radiation of an antenna above the effective ground level. 2.
effective input noise temperature The source noise temperature in a two-port network or amplifier that will result in the same output noise power, when connected to a noise-free network or…
effective isotropically radiated power (e.i.r.p.) The arithmetic product of (a) the power supplied to an antenna and (b) its gain.
effective mode volume For an optical fiber, the square of the product of the diameter of the near-field pattern and the sine of the radiation angle of the far-field pattern.
effective monopole radiated power (e.m.r.p.) The product of the power supplied to the antenna and its gain relative to a short vertical antenna in a given direction. [RR]
effective power In alternating-current power transmission and distribution, the product of the rms voltage and amperage, i.e.
effective radiated power (e.r.p.) (in a given direction) The power supplied to an antenna multiplied by the antenna gain in a given direction.
effective speed of transmission Synonym effective transmission rate.
effective transmission rate The rate at which information is processed by a transmission facility. Note 1: The effective transmission rate is calculated as (a) the measured number of…
Effectiveness A property of a Target of Evaluation representing how well it provides security in the context of its actual or proposed operational use [ITSEC].
efficiency factor In data communications, the ratio of (a) the time to transmit a text automatically at a specified modulation rate to (b) the time actually required to…
EFT Electronic Funds Transfer
EGA Enhanced Graphic Adapter (TelComm/Computer term).
EHF Extremely High Frequency.
EIA Electronic Industries Association EIM
EIA Class IVa fiber Synonym dispersion-unshifted fiber.
EIA Class IVb fiber Synonym dispersion-shifted fiber.
EIA interface Any of a number of equipment interfaces compliant with voluntary industry standards developed by the Electronic Industries Association (EIA) to define…
Eight Ingredient Framework A systematic and comprehensive framework that a) consists of the ingredients that make up communications infrastructure, b) includes all of these…
eight-hundred (800) service A service that allows call originators to place toll telephone calls to 800-service subscribers, from within specified rate areas, without a charge to the…
EISA Extended Industry Standard Architecture (Telecomm/Computer term). 90
elastic buffer 1. A buffer that has an adjustable capacity for data. 2. A buffer that introduces an adjustable delay of signals.
electric field The effect produced by the existence of an electric charge, such as an electron, ion, or proton, in the volume of space or medium that surrounds it.
electrical length Of a transmission medium, its length expressed as a multiple or submultiple of the wavelength of a periodic electromagnetic or electrical signal…
electrically powered telephone A telephone in which the operating power is obtained either from a battery located at the telephone, i.e.
electro-optic detector Deprecated term. See optoelectronic.
electro-optic effect Any one of a number of phenomena that occur when an electromagnetic wave in the optical spectrum interacts with an electric field, or with matter under…
electro-optic modulator An optical device in which a signal-controlled element is used to modulate a beam of light.
electro-optical intelligence (ELECTRO-OPTINT) Intelligence information other than signals intelligence derived from the optical monitoring of the electromagnetic spectrum from ultraviolet (0.
electro-optics The technology associated with those components, devices and systems which are designed to interact between the electromagnetic (optical) and the electric…
ELECTRO-OPTINT Acronym for electro-optical intelligence.
electrochemical recording Facsimile recording by means of a chemical reaction brought about by the passage of a signal-controlled current through the sensitized portion of the…
electrographic recording See electrostatic recording.
electroluminescence Nonthermal conversion of electrical energy into light. Note 1: Electroluminescence is distinguished from incandescence, which is a thermal process.
electrolytic recording Electrochemical facsimile recording in which the recorded copy is made by the passage of a signal-controlled current through an electrolyte which causes…
Electromagnetic Compatibility (EMC) A condition when all electromagnetic emissions from electronic, electro-magnetic, and electro-optical components of a system interact without interfering…
electromagnetic emission control The control of friendly electromagnetic emissions, such as radio and radar transmissions, for the purpose of preventing or minimizing their use by…
electromagnetic environment (EME) For a telecommunications system, the spatial distribution of electromagnetic fields surrounding a given site.
Electromagnetic Interference (EMI) Any electromagnetic disturbance that interrupts, obstructs, or otherwise degrades or limits the effective performance of electronics/electrical equipment.