embedded customer-premises equipmentTelephone-company-provided premises equipment in use or in inventory of a regulated telephone utility as of divestiture (December 31, 1983).
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 changeoverA 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 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 callA call identified as receiving emergency service treatment. The call has an associated CESID (caller's emergency service ID), bridging, and transfer…
emergency service routing exchangeThe first exchange in the call connection capable of invoking the routing portion of the RBTESC service.
emergency service transfer exchangeA 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-termA 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…
emissionElectromagnetic 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 securityProtection resulting from measures taken to deny unauthorized persons information derived from intercept and analysis of compromising emanations from…
emission spectrumOf a radio emission, the distribution of power or energy as a function of frequency.
EmissivityThe 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…
emoticonAbbreviation for emotion icon. In electronic communication, a multi-character symbol, created with ASCII characters, to express emotions and physical…
EmphasisAn 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…
Employee/Official NumberA number assigned by a service provider for its own internal business purposes. See "Administrative Numbers" definition.
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 signalingSignaling in which address digits are transmitted in one or more blocks, each block containing sufficient address information to enable switching centers…
EnabledWhen applied to privilege: a privilege that is active, i.e., has its effective flag set [POSIX.6].
enabling signalA signal that permits the occurrence of an event.
encapsulationAny 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.
EnciphermentThe cryptographic transformation of data (see cryptography) to produce ciphertext [7498-2].
encodeThe gene product specified by a particular nucleic acid sequence. See: genetic code.
EncodingThe process used to imprint or inscribe MICR characters on checks, deposits, and other financial instruments.
encoding lawA law defining the relative values of the quantum steps used in quantizing and encoding signals.
encryptTo programmatically disguise content to hide its substance.
EncryptionA procedure that renders the contents of a message or file unintelligible to anyone not authorized to read it.
encryption algorithmIn cryptography, a set of mathematically expressed processes for rendering information into apparently meaningless form by developing a series of…
encryption elementA group of contiguous characters to be encrypted. [After X9.23]
end certificateThe last certificate considered in a certificate chain.
end distortionIn 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 entity1. 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 finishFor an optical fiber, the optical quality of the surface at the end of the fiber.
end instrumentA 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 EncryptionCommunications encryption in which data is encrypted when being passed through a network, but routing information remains visible.
End UserA person who uses SmarterMail to send and receive mail, or to manage a domain consisting of other end user email accounts.
end-of-medium characterA 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 functionIn tape relay procedure, the letter and key functions, including the end-of-message indicator, that constitute the last format line.
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 communicationA 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/integrity1. A characteristic of preserving the privacy and/or unadulterated nature of communicated data across networks which may include, e.g.
end-to-end enciphermentEncipherment 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 securitySafeguarding information in a secure telecommunication system by cryptographic or protected distribution system means from point of origin to point of…
end-to-end signalingThe capability changeover procedure to be used whenever the normal one cannot be accomplished (i.e.
endpoint nodeIn network topology, a node connected to one and only one yybranch. Synonym peripheral node.
endurabilityThe property of a system, subsystem, equipment, or process that enables it to continue to function within specified performance limits for an extended…
enhanced 911 (E911) systemA system that establishes connections between customer installations (CIs) and constituent public service access points (PSAPs), provides automatic…
enhanced serviceService, offered over commercial carrier transmission facilities used in interstate communications, that employs computer processing applications that act…
enhanced service providerA 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 providersA for-profit business that offers to transmit voice and data messages and simultaneously adds value to the messages it transmits.
entrance facilityThe entrance to a building for both public and private network service cables (including antenna transmission lines, where applicable), including the…
entrance pointIn a building, the point of emergence of telecommunications service cables through an exterior wall, floor slab, or from a rigid metal conduit or…
entrance roomIn a building, a space in which the joining of inter- and/or intrabuilding telecommunications backbone facilities takes place.
EntrapmentThe act of inducing a person to commit a crime so that a criminal charge will be brought against him.
envelopeThe boundary of the family of curves obtained by varying a parameter of a wave. See figure under amplitude modulation.
envelope delay distortionSignal distortion that results when the rate of change of phase shift with frequency over the necessary bandwidth of the signal is not constant.
environmental controlmanagement of the conditions where records are stored, including temperature, humidity, air quality, light, and pests See also climate control.
Environmental SecurityA specialized form of physical security that prevents technical penetration, e.g., penetration by waves of electron beams.
EOElected Office - the national Office or intergovernmental organization of or acting for the Contracting State elected by the applicant under Chapter II of…
EOTAbbreviation for end-of-transmission character.
ephemerisA 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 dateA 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 costsInclude only initial incremental presubscription costs and initial incremental expenditures for hardware and software related directly to the provision of…
equal gain combinerA 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…