Telecommunications terms starting with E

405 terms

Employee/Official Number A number assigned by a service provider for its own internal business purposes. See "Administrative Numbers" definition.
EMR Electromagnetic Radiation.
EMR hazards Abbreviation for electromagnetic radiation hazards.
EMS Event Management System. A subsystem that controls the generation and propagation of events in the Data ONTAP kernel.
EMSEC Emanations Security.
emulate To duplicate the functions of one system with a different system, so that the second system appears to behave like the first system.
EMV Electromagnetic Vulnerability.
en banc "In the bench" or "full bench." Refers to court sessions with the entire membership of a court participating rather than the usual quorum. U.S.
en-bloc signaling Signaling in which address digits are transmitted in one or more blocks, each block containing sufficient address information to enable switching centers…
Enabled When applied to privilege: a privilege that is active, i.e., has its effective flag set [POSIX.6].
enabling signal A signal that permits the occurrence of an event.
encapsulation Any method packaging an enzyme or bacterium and maintaining its normal functions. Used to immobilize cells in a bioreactor.
encipher [To] Convert plain text into an unintelligible form by means of a cipher. [NIS] 2.
Encipherment The cryptographic transformation of data (see cryptography) to produce ciphertext [7498-2].
encode The gene product specified by a particular nucleic acid sequence. See: genetic code.
encoder See analog-to-digital converter.
Encoding The process used to imprint or inscribe MICR characters on checks, deposits, and other financial instruments.
encoding law A law defining the relative values of the quantum steps used in quantizing and encoding signals.
encrypt To programmatically disguise content to hide its substance.
Encryption A procedure that renders the contents of a message or file unintelligible to anyone not authorized to read it.
encryption algorithm In cryptography, a set of mathematically expressed processes for rendering information into apparently meaningless form by developing a series of…
encryption element A group of contiguous characters to be encrypted. [After X9.23]
end certificate The last certificate considered in a certificate chain.
end distortion In start-stop teletypewriter operation, the shifting of the end of all marking pulses, except the stop pulse, from their proper positions in relation to…
end entity 1. In cryptography, a certificate subject that (a) uses its private key for purposes other than signing certificates, or (b) uses its public key for…
end exchange Synonym end office.
end finish For an optical fiber, the optical quality of the surface at the end of the fiber.
end instrument A communication device that is connected to the terminals of a circuit.
end office (EO) A central office at which user lines and trunks are interconnected. Synonym end exchange.
end system (ES) A system containing the application processes that are the ultimate source and sink of user traffic.
End to End Encryption Communications encryption in which data is encrypted when being passed through a network, but routing information remains visible.
End User A person who uses SmarterMail to send and receive mail, or to manage a domain consisting of other end user email accounts.
end-of-medium character A control character that may be used to identify either the physical end of a data medium or the end of the usable or used portion of a data medium.
end-of-message function In tape relay procedure, the letter and key functions, including the end-of-message indicator, that constitute the last format line.
end-of-selection character The character that indicates the end of the selection signal.
end-of-text character (ETX) A transmission control character used to terminate text.
end-of-transmission character (EOT) A transmission control character used to indicate the conclusion of a transmission that may have included one or more texts and any associated message…
end-of-transmission-block character (ETB) A transmission control character used to indicate the end of a transmission block of data when data are divided into such blocks for transmission purposes.
end-to-end communication A direct peer to peer communication of terminal equipment (TE) to TE, or TE to a network gateway supporting, for example, PSPDN interworking (public…
end-to-end confidentiality/integrity 1. A characteristic of preserving the privacy and/or unadulterated nature of communicated data across networks which may include, e.g.
end-to-end encipherment Encipherment of data within or at the source end system, with the corresponding decipherment occurring only within or at the destination end system.
end-to-end security Safeguarding information in a secure telecommunication system by cryptographic or protected distribution system means from point of origin to point of…
end-to-end signaling The capability changeover procedure to be used whenever the normal one cannot be accomplished (i.e.
endpoint node In network topology, a node connected to one and only one yybranch. Synonym peripheral node.
endurability The property of a system, subsystem, equipment, or process that enables it to continue to function within specified performance limits for an extended…
endurable operation See endurability.
engineering channel Synonym orderwire circuit.
engineering orderwire (EOW) Synonym orderwire circuit.
enhanced 911 (E911) system A system that establishes connections between customer installations (CIs) and constituent public service access points (PSAPs), provides automatic…
enhanced service Service, offered over commercial carrier transmission facilities used in interstate communications, that employs computer processing applications that act…
enhanced service provider A company that provides, via a connection to an exchange carrier, services that add value to voice and/or data information. [T1.251-1996]
enhanced service providers A for-profit business that offers to transmit voice and data messages and simultaneously adds value to the messages it transmits.
enhanced-quality television Synonym [in ITU-T usage] improved-definition television.
ENQ Abbreviation for enquiry character.
enquiry character (ENQ) A transmission control character used as a request for a response from the station with which a connection has been set up.
entity A legally recognized organization.
entrance facility The entrance to a building for both public and private network service cables (including antenna transmission lines, where applicable), including the…
entrance point In a building, the point of emergence of telecommunications service cables through an exterior wall, floor slab, or from a rigid metal conduit or…
entrance room In a building, a space in which the joining of inter- and/or intrabuilding telecommunications backbone facilities takes place.
Entrapment The act of inducing a person to commit a crime so that a criminal charge will be brought against him.
envelope The boundary of the family of curves obtained by varying a parameter of a wave. See figure under amplitude modulation.
envelope delay distortion Signal distortion that results when the rate of change of phase shift with frequency over the necessary bandwidth of the signal is not constant.
environmental control management of the conditions where records are stored, including temperature, humidity, air quality, light, and pests See also climate control.
Environmental Security A specialized form of physical security that prevents technical penetration, e.g., penetration by waves of electron beams.
EO Elected Office - the national Office or intergovernmental organization of or acting for the Contracting State elected by the applicant under Chapter II of…
EOT Abbreviation for end-of-transmission character.
EOW Abbreviation for engineering orderwire.
ephemeris A electronic or hard-copy table or listing of the predicted positions of astronomical bodies such as the planets or the Moon; and by extension, the…
epoch date A date in history, chosen as the reference date from which time is measured. Note 1: An example of an epoch date is the beginning instant of January 1…
equal access costs Include only initial incremental presubscription costs and initial incremental expenditures for hardware and software related directly to the provision of…
equal gain combiner A diversity combiner in which the signals on each channel are added. Note: The channel gains can be made to remain always and everywhere equal so that the…
Equal Level Echo Path Loss The term "Equal Level Echo Path Loss" (ELEPL) denotes the measure of Echo Path Loss (EPL) at a 4-wire interface which is corrected by the difference…
equal-length code A telegraph or a data code in which (a) all the words or code groups are composed of the same number of unit elements, (b) each element has the same…
equal-level patch bay An analog patching facility at which all nominal input and output voice frequency levels are uniform.
equalization The maintenance of system transfer function characteristics within specified limits by modifying circuit parameters.
equatorial orbit For a satellite orbiting the Earth, an orbit in the equatorial plane. Note: An equatorial orbit has an inclination angle of 0°.
equilibrium coupling length Synonym equilibrium length.
equilibrium length For a specific excitation condition, the length of multimode optical fiber necessary to attain equilibrium mode distribution.
equilibrium mode distribution (EMD) That condition in a multimode fiber wherein after propagation has taken place for a certain distance, called the "equilibrium length," the relative power…
equilibrium mode distribution length Synonym equilibrium length.
equilibrium mode power distribution Synonym equilibrium mode distribution.
equilibrium mode simulator For an optical fiber, a device or optical system used to create an approximation of the equilibrium mode distribution.
equipment clock A clock that satisfies the particular needs of equipment and, in some cases, may control the flow of data at the equipment interface.
equipment intermodulation noise Intermodulation noise introduced into a system by a specific piece of equipment.
equipment room In a building, a centralized space for telecommunications equipment that serves the occupants of the building.
equipment side The portion of a device that is directly connected to facilities internal to a station, such as the data terminal equipment (DTE) side of the…
equipotential ground plane A mass, or bonded masses, of conducting material that offer a negligible impedance to current flow.
Equivalent Equal under patent law. MPEP 904.01(b), MPEP 2144.06, MPEP 2183.
equivalent gauge A standard cross section of cable conductors for use in equating the metallic content of cable conductors of all gauges to a common base. [47 CFR Pt.36-A]
equivalent network In a system, a network that may replace another network without altering the performance of the system. 2.
equivalent noise resistance A quantitative representation in resistance units of the spectral density of a noise-voltage generator, given by Rn = (Wn)/(kT0), where Wn is the spectral…
equivalent noise temperature The temperature, usually expressed in kelvins, of a hypothetical matched resistance at the input of an assumed noiseless device, such as a noiseless…
equivalent pair kilometers The product of sheath kilometers and the number of equivalent gauge pairs of conductors in a cable. [47 CFR Pt.36-A]
equivalent pulse code modulation (PCM) noise The amount of thermal noise power on a frequency-division multiplexed (FDM) or wire channel necessary to approximate the same judgment of speech quality…
equivalent satellite link noise temperature The noise temperature referred to the output of the receiving antenna of the Earth station corresponding to the radio-frequency noise power which produces…
equivalent sheath kilometers The product of (a) the length of a section of cable in kilometers (sheath kilometers) and (b) the ratio of the metallic content applicable to a particular…
ER link Abbreviation for emergency response link.
erase To obliterate information from a storage medium, such as to clear or to overwrite. 2.
erasure [A] process intended to render magnetically stored information irretrievable by normal means. [INFOSEC-99]
erect position In frequency-division multiplexing, a position of a translated channel in which an increase signal frequency in the untranslated channel causes an…