Telecommunications — page 27 of 85

Telecommunications terms

2601. 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…
2602. EFT Electronic Funds Transfer
2603. EGA Enhanced Graphic Adapter (TelComm/Computer term).
2604. EHF Extremely High Frequency.
2605. EIA Electronic Industries Association EIM
2606. EIA Class IVa fiber Synonym dispersion-unshifted fiber.
2607. EIA Class IVb fiber Synonym dispersion-shifted fiber.
2608. EIA interface Any of a number of equipment interfaces compliant with voluntary industry standards developed by the Electronic Industries Association (EIA) to define…
2609. Eight Ingredient Framework A systematic and comprehensive framework that a) consists of the ingredients that make up communications infrastructure, b) includes all of these…
2610. 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…
2611. EISA Extended Industry Standard Architecture (Telecomm/Computer term). 90
2612. elastic buffer 1. A buffer that has an adjustable capacity for data. 2. A buffer that introduces an adjustable delay of signals.
2613. 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.
2614. electrical length Of a transmission medium, its length expressed as a multiple or submultiple of the wavelength of a periodic electromagnetic or electrical signal…
2615. electrically powered telephone A telephone in which the operating power is obtained either from a battery located at the telephone, i.e.
2616. electro-optic detector Deprecated term. See optoelectronic.
2617. 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…
2618. electro-optic modulator An optical device in which a signal-controlled element is used to modulate a beam of light.
2619. electro-optical intelligence (ELECTRO-OPTINT) Intelligence information other than signals intelligence derived from the optical monitoring of the electromagnetic spectrum from ultraviolet (0.
2620. electro-optics The technology associated with those components, devices and systems which are designed to interact between the electromagnetic (optical) and the electric…
2621. ELECTRO-OPTINT Acronym for electro-optical intelligence.
2622. 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…
2623. electrographic recording See electrostatic recording.
2624. electroluminescence Nonthermal conversion of electrical energy into light. Note 1: Electroluminescence is distinguished from incandescence, which is a thermal process.
2625. 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…
2626. Electromagnetic Compatibility (EMC) A condition when all electromagnetic emissions from electronic, electro-magnetic, and electro-optical components of a system interact without interfering…
2627. 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…
2628. electromagnetic environment (EME) For a telecommunications system, the spatial distribution of electromagnetic fields surrounding a given site.
2629. Electromagnetic Interference (EMI) Any electromagnetic disturbance that interrupts, obstructs, or otherwise degrades or limits the effective performance of electronics/electrical equipment.
2630. electromagnetic interference (EMI) control The control of radiated and conducted energy such that emissions that are unnecessary for system, subsystem, or equipment operation are reduced…
2631. electromagnetic intrusion The intentional insertion of electromagnetic energy into transmission paths in any manner, with the objective of deceiving operators or of causing…
2632. Electromagnetic Pulse (EMP) The electromagnetic radiation from a nuclear explosion caused by Comptonrecoil electrons and photoelectrons from photons scattered in the materials of the…
2633. Electromagnetic Radiation (EMR) (1) A form of propagated energy, arising from electric charges in motion that produces a simultaneous wavelike variation of electric and magnetic fields…
2634. electromagnetic radiation hazards (RADHAZ or EMR hazards) Hazards caused by a transmitter/antenna installation that generates electromagnetic radiation in the vicinity of ordnance, personnel, or fueling…
2635. Electromagnetic Spectrum The entire range of wavelengths of electromagnetic energy, including (from short to long wavelengths) gamma rays, X rays, ultraviolet light, visible…
2636. electromagnetic survivability The ability of a system, subsystem, or equipment to resume functioning without evidence of degradation following temporary exposure to an adverse…
2637. electromagnetic susceptibility Of an electronic circuit or device, the degree to which it is subject to malfunction or failure under the influence of electromagnetic radiation.
2638. electromagnetic vulnerability (EMV) The characteristics of a system that cause it to suffer a definite degradation (incapability to perform the designated mission) as a result of having been…
2639. electromagnetic wave (EMW) A wave produced by the interaction of time-varying electric and magnetic fields.
2640. electromechanical recording Recording by means of a signal-actuated mechanical device.
2641. electronic bulletin board Synonym bulletin board.
2642. electronic cash See e-cash.
2643. electronic classroom Synonym teletraining.
2644. electronic commerce See e-commerce.
2645. Electronic Counter- Countermeasures (ECCM) That division of electronic warfare involving actions taken to insure friendly effective use of the electromagnetic, optical, and acoustic spectra despite…
2646. electronic countermeasures (ECM) That division of electronic warfare involving actions taken to prevent or reduce an enemy's effective use of the electromagnetic spectrum.
2647. electronic data interchange See EDI.
2648. electronic deception The deliberate radiation, reradiation, alteration, suppression, absorption, denial, enhancement, or reflection of electromagnetic energy in a manner…
2649. electronic distribution In encryption, the distribution of keying materials among entities by means of an electronic communication.
2650. electronic emission security 1. Those measures taken to protect all transmissions from interception and electronic analysis. 2.
2651. electronic equipment enclosure (EEE) An enclosure housing telecommunications electronics equipment. It may consist of a weatherproof enclosure, equipment pad or an equipment hut.
2652. Electronic funds transfer Electronic funds transfer (EFT) is the means by which financial institutions exchange billions of dollars every day without the physical movement of any…
2653. electronic information processing system (EIP System) An assembly of computer hardware, software and firmware, configured for the purpose of processing, storing or forwarding information [CESG].
2654. electronic information systems security (INFOSEC) The technical measures to ensure the security of information handled by communications, non-communications and computer systems [CESG].
2655. electronic jamming See jamming.
2656. electronic key management system (EKMS) [An] interoperable collection of systems being developed by services and agencies of the U.S.
2657. electronic line of sight The path traversed by electromagnetic waves that is not subject to reflection or refraction by the atmosphere. [JP 1-02]
2658. electronic line scanning In facsimile, a method of scanning that provides motion of the scanning spot along the scanning line by electronic means.
2659. electronic magazine See e-zine.
2660. electronic mail transmission of messages, their metadata, and possible attachments over communications networks
2661. electronic message system (EMS) A message system incorporating electronic mail to a central facility which then assumes responsibility for delivering the message in hard copy form.
2662. electronic messaging service [A] service providing interpersonal messaging capability; meeting specific functional, management, and technical requirements; and yielding a…
2663. electronic payment gateway Software and hardware interfacing merchants and credit-card authorization networks. [Mattila]
2664. electronic publishing (e-publishing) The process of creating messages, distributing them, and reproducing them entirely online, often with a capability for feedback.
2665. electronic reconnaissance The detection, identification, evaluation, and location of foreign electromagnetic radiations emanating from other than nuclear detonations or radioactive…
2666. electronic security environment The ESE defines the system in security terms, identifying boundaries of security significance. These boundaries may be: a. internal, i.e.
2667. electronic signature A stamp added to mail messages, fields, or sections that verifies that the person who originated the message is the author and that no one has tampered…
2668. electronic switching system (ESS) 1. A telephone switching system based on the principles of time-division multiplexing of digitized analog signals.
2669. electronic till The part of e-commerce (electronic commerce) software that processes real-time credit card payments. [After Mattila]
2670. electronic wallet A Web-browser plug-in that handles and stores a user's credit card and payment information. [Mattila]
2671. Electronic Warfare (EW) Any military activity involving the use of electromagnetic and directed energy to control the electromagnetic spectrum or to attack the enemy.
2672. electronic warfare support measures (ESM) That division of electronic warfare involving actions taken under direct control of an operational commander to search for, intercept, identify, and…
2673. electronically controlled coupling (ECC) The coupling of a lightwave from one dielectric waveguide into another dielectric waveguide upon the application of an electric field or electrical signal.
2674. electronically generated key [A] key generated in a COMSEC device by introducing (either mechanically or electronically) a seed key into the device and then using the seed, together…
2675. Electronics Intelligence (ELINT) Technical and geo-location intelligence derived from foreign non-communications electromagnetic radiations emanating from other than nuclear detonations…
2676. Electronics Security (ELSEC) The protection resulting from all measures designed to deny unauthorized persons information of value that might be derived from their interception and…
2677. electrophotographic recording Recording in which light is used to produce a change in electrostatic charge distribution to form a photographic image.
2678. electrosensitive recording Recording in which an electrical signal is directly impressed on the record medium.
2679. electrostatic discharge (ESD) The rapid, spontaneous transfer of electrostatic charge induced by a high electrostatic field.
2680. electrostatic discharge (ESD) protective Having the capability of dissipating or limiting the generation of electrostatic charge, or of providing shielding from electrostatic discharges or…
2681. electrostatic field The electric field produced by an electrostatic charge. [T1.308-1996]
2682. electrostatic recording Recording by means of a signal-controlled electrostatic field. Note: Subsequent processing is usually required to make the image visible.
2683. electrostatic shield A barrier or enclosure that attenuates an electrostatic field. [T1.321-1995]
2684. electrothermal recording That type of recording produced principally by signal-controlled thermal action.
2685. elemental area In facsimile transmission systems, any segment of a scanning line, the dimension of which along the line is exactly equal to the nominal line width.
2686. elementary signaling element See unit interval.
2687. elevated duct An atmospheric duct consisting of a high-density air layer that starts at high altitudes and continues upward or remains at high altitudes, thus affecting…
2688. ELF Extremely Low Frequency.
2689. ELINT Electronics Intelligence.
2690. elliptic curve private key (d) In cryptology and within particular elliptic curve parameters, a statistically unique and unpredictable integer in the interval [1, n - 1], where n is the…
2691. elliptic curve public key In cryptography, given particular elliptic curve parameters (and an elliptic curve private key d), the elliptic curve point Q = dP. [After X9.62]
2692. elliptical polarization In electromagnetic wave propagation, polarization such that the tip of the electric field vector describes an ellipse in any fixed plane intersecting, and…
2693. ELSEC Electronics Security.
2694. Emanations Security (EMSEC) The protection that results from all measures designed to deny unauthorized persons information of value that might be derived from intercept and analysis…
2695. embed In Web page design, to link or to insert an inline video image or sound file into the page so that it is hyperlinked and clickable. 2.
2696. embedded adaptive differential pulse code modulation (embedded ADPCM) Modulation achieved using algorithms that quantize the difference between the input and the estimated signal into core bits and enhancement bits. [T1.
2697. embedded base equipment Customer-premises equipment that had been provided by the Bell Operating Companies prior to January 1, 1984, that was ordered transferred from the BOCs to…
2698. embedded computer [A] computer system that is an integral part of a larger system. [INFOSEC-99]
2699. embedded cryptographic system [A] cryptosystem performing or controlling a function as an integral element of a larger system or subsystem. [INFOSEC-99]
2700. embedded cryptography Cryptography engineered into an equipment or system whose basic function is not cryptographic. [INFOSEC-99]