Telecommunications terms starting with E

405 terms

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…
electromagnetic intrusion The intentional insertion of electromagnetic energy into transmission paths in any manner, with the objective of deceiving operators or of causing…
Electromagnetic Pulse (EMP) The electromagnetic radiation from a nuclear explosion caused by Comptonrecoil electrons and photoelectrons from photons scattered in the materials of the…
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…
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…
Electromagnetic Spectrum The entire range of wavelengths of electromagnetic energy, including (from short to long wavelengths) gamma rays, X rays, ultraviolet light, visible…
electromagnetic survivability The ability of a system, subsystem, or equipment to resume functioning without evidence of degradation following temporary exposure to an adverse…
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.
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…
electromagnetic wave (EMW) A wave produced by the interaction of time-varying electric and magnetic fields.
electromechanical recording Recording by means of a signal-actuated mechanical device.
electronic bulletin board Synonym bulletin board.
electronic cash See e-cash.
electronic classroom Synonym teletraining.
electronic commerce See e-commerce.
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…
electronic countermeasures (ECM) That division of electronic warfare involving actions taken to prevent or reduce an enemy's effective use of the electromagnetic spectrum.
electronic data interchange See EDI.
electronic deception The deliberate radiation, reradiation, alteration, suppression, absorption, denial, enhancement, or reflection of electromagnetic energy in a manner…
electronic distribution In encryption, the distribution of keying materials among entities by means of an electronic communication.
electronic emission security 1. Those measures taken to protect all transmissions from interception and electronic analysis. 2.
electronic equipment enclosure (EEE) An enclosure housing telecommunications electronics equipment. It may consist of a weatherproof enclosure, equipment pad or an equipment hut.
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…
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].
electronic information systems security (INFOSEC) The technical measures to ensure the security of information handled by communications, non-communications and computer systems [CESG].
electronic jamming See jamming.
electronic key management system (EKMS) [An] interoperable collection of systems being developed by services and agencies of the U.S.
electronic line of sight The path traversed by electromagnetic waves that is not subject to reflection or refraction by the atmosphere. [JP 1-02]
electronic line scanning In facsimile, a method of scanning that provides motion of the scanning spot along the scanning line by electronic means.
electronic magazine See e-zine.
electronic mail transmission of messages, their metadata, and possible attachments over communications networks
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.
electronic messaging service [A] service providing interpersonal messaging capability; meeting specific functional, management, and technical requirements; and yielding a…
electronic payment gateway Software and hardware interfacing merchants and credit-card authorization networks. [Mattila]
electronic publishing (e-publishing) The process of creating messages, distributing them, and reproducing them entirely online, often with a capability for feedback.
electronic reconnaissance The detection, identification, evaluation, and location of foreign electromagnetic radiations emanating from other than nuclear detonations or radioactive…
electronic security environment The ESE defines the system in security terms, identifying boundaries of security significance. These boundaries may be: a. internal, i.e.
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…
electronic switching system (ESS) 1. A telephone switching system based on the principles of time-division multiplexing of digitized analog signals.
electronic till The part of e-commerce (electronic commerce) software that processes real-time credit card payments. [After Mattila]
electronic wallet A Web-browser plug-in that handles and stores a user's credit card and payment information. [Mattila]
Electronic Warfare (EW) Any military activity involving the use of electromagnetic and directed energy to control the electromagnetic spectrum or to attack the enemy.
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…
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.
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…
Electronics Intelligence (ELINT) Technical and geo-location intelligence derived from foreign non-communications electromagnetic radiations emanating from other than nuclear detonations…
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…
electrophotographic recording Recording in which light is used to produce a change in electrostatic charge distribution to form a photographic image.
electrosensitive recording Recording in which an electrical signal is directly impressed on the record medium.
electrostatic discharge (ESD) The rapid, spontaneous transfer of electrostatic charge induced by a high electrostatic field.
electrostatic discharge (ESD) protective Having the capability of dissipating or limiting the generation of electrostatic charge, or of providing shielding from electrostatic discharges or…
electrostatic field The electric field produced by an electrostatic charge. [T1.308-1996]
electrostatic recording Recording by means of a signal-controlled electrostatic field. Note: Subsequent processing is usually required to make the image visible.
electrostatic shield A barrier or enclosure that attenuates an electrostatic field. [T1.321-1995]
electrothermal recording That type of recording produced principally by signal-controlled thermal action.
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.
elementary signaling element See unit interval.
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…
ELF Extremely Low Frequency.
ELINT Electronics Intelligence.
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…
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]
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…
ELSEC Electronics Security.
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…
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.
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.
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…
embedded computer [A] computer system that is an integral part of a larger system. [INFOSEC-99]
embedded cryptographic system [A] cryptosystem performing or controlling a function as an integral element of a larger system or subsystem. [INFOSEC-99]
embedded cryptography Cryptography engineered into an equipment or system whose basic function is not cryptographic. [INFOSEC-99]
embedded customer-premises equipment Telephone-company-provided premises equipment in use or in inventory of a regulated telephone utility as of divestiture (December 31, 1983).
embedded operations channel (EOC) A channel provided on telecommunications facilities to support administration and maintenance.
embedded processor In non-ADP equipment, a CPU and firmware that are critical to the operation of the equipment.
EMC Environmental Modeling Center
EMC analysis Analysis of a system, subsystem, facility, or equipment to determine its electromagnetic compatibility (EMC) status.
EMCON Emission Control
EMD Engineering and Manufacturing Development (previously referred to as FSD).
EME Electromagnetic Environment. 93
Emergency Broadcast System (EBS) The EBS is composed of AM, FM, and TV broadcast stations; low-power TV stations; and non-Government industry entities operating on a voluntary, organized…
emergency changeover A modified changeover procedure that is used whenever the normal changeover procedure cannot be used because of failure(s) in the signaling terminal…
emergency locator transmitter (ELT) A transmitter of an aircraft or survival craft actuated manually or automatically that is used as an alerting and locating aid for survival purposes.
emergency position-indicating radiobeacon station A station in the mobile service the emissions of which are intended to facilitate search and rescue operations. [NTIA] [RR]
emergency response link (ERlink) A web site intended for information sharing by the Federal Response Plan (FRP) community.
emergency service attendant position (ESAP) A special attendant position used to terminate emergency calls. It provides sufficient signaling and display capabilities to support the functionality of…
emergency service call A call identified as receiving emergency service treatment. The call has an associated CESID (caller's emergency service ID), bridging, and transfer…
emergency service routing exchange The first exchange in the call connection capable of invoking the routing portion of the RBTESC service.
emergency service transfer exchange A local exchange that is capable of invoking the bridging and transfer portions of the RBTESC (routing, bridging and transfer of emergency service calls)…
emergency service zone (ESZ) A geographical area within the emergency service serving area in which all callers are served by the same set of emergency service agencies. [T1.628-1993]
emergency short-term A period of not more than 72 consecutive hours (the aggregate of which do not exceed 15 days per year) during which emergency calls and services are…
EMI Electromagnetic Interference.
emission Electromagnetic energy propagated from a source by radiation or conduction. Note: The emission may be either desired or undesired and may occur anywhere…
Emission Control (EMCON) The selective and controlled use of electromagnetic, acoustic, or other emitters to optimize command and control capabilities while minimizing: a)…
emission security Protection resulting from measures taken to deny unauthorized persons information derived from intercept and analysis of compromising emanations from…
emission spectrum Of a radio emission, the distribution of power or energy as a function of frequency.
emissions security See emission security.
Emissivity The ratio of the radiant energy (heat) leaving (being emitted by) a surface to that of a black body at the same temperature and with the same area…
emoticon Abbreviation for emotion icon. In electronic communication, a multi-character symbol, created with ASCII characters, to express emotions and physical…
EMP Electromagnetic Pulse.
Emphasis An HTML tag used to emphasize text. Please note that it is more important that copy reads well to humans than any boost you may think you will get by…