Glossary: Mostlyabreviations and acronyms:
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E1: European basic multiplex rate which packsthirty voice channels into a 256 bit frame and transmitted at 2.048 Mbps.European counterpart to DS1.

 ECM: Entitlement Control Message: Entitlementcontrol messages are private conditional access information which specifycontrol words and possibly other stream-specific, scrambling, and/or controlparameters.

EDA: Electronic Design Automation


edge device: 1. A physical device thatis capable of forwarding packets between legacy interfaces (such as Ethernetand Token Ring) and ATM interfaces based on data-linkand network layer information. An edge device does not participate in therunning of any network layer routing protocol, but it obtains forwardingdescriptions using the route distribution protocol. 2. Any device thatisn't an ATM switch that can connect to an ATMswitch.

EDI: Electronic Data Interchange

editing: A process by which one or morecompressed bit streams are manipulated to produce a new compressed bitstream. Conforming edited bit streams are understood to meet the requirementsdefined in the Digital Television Standard, (see the Advanced TelevisionStandards Committee; (ATSC)

EDO: Extended Data Output, (RAM)

EDS: Electronic Data Systems, Inc.


EGP: External Gateway Protocol

EIA: Electronic Industries Association

EIDE or E-IDE:Extended Integrated Drive Electronics

E-IGRP: Enhanced-IGRP,(Cisco)

EISA: Extended Industry Standard Architecture

ELG: European Launching Group; the initialgroup established to oversee the development of digital television in Europe.

EMA: Enterprise Management Architecture (DEC)

EMACS: Editing MACroS, or Extensible MACroSystem; A popular screen editor used on Unix, VMS and other systems.

EMBARC: Electronic Mail Broadcast to RoamingComputers, (Motorola)

EMM: Entitlement Management Message; Entitlementmanagement messages are private conditional access information which specifythe authorization level or the services of specific decoders. They maybe addressed to single decoders or groups of decoders.

encoder: An embodiment of an encoding process.

encoding (process): A process that readsa stream of input pictures or audio samples and produces a valid codedbit stream as defined in the Digital Television Standard, (see the AdvancedTelevision Standards Committee; ATSC)

ENR: Enterprise Network Roundtable, an ATMForum committee.

entropy coding: Variable lengthlossless coding of the digital representation of a signal to reduce redundancy.

entry point: Refers to a point in acoded bit stream after which a decoder can become properly initializedand commence syntactically correct decoding. The first transmitted pictureafter an entry point is either an I-picture ora P-picture. If the first transmitted pictureis not an I-picture, the decoder may produce oneor more pictures during acquisition.

EPG: Electronic Program Guide

EPS: Encapsulated PostScript

ERP: Enterprise Resource Planning

ES: Elementary Stream; A generic term for oneof the coded video, coded audio or other coded bit streams. One elementarystream is carried in a sequence of PES packets withone and only one stream_id.

ESA: Enterprise Systems Architecture (IBM)

ESCR: Elementary Stream Clock Reference; Atime stamp in the PES Stream from which decoders ofPES streams may derive timing.

ESDA: Electronic System Design Automation

ESM: European Satellite Multimedia; Luxembourgbased service company.

ESRI: Environmental Systems Research Institute,Inc. (

ETC: Enhanced Throughput Cellular

ETR: ETSI Technical Report

ETSI: European Telecommunication StandardsInstitute, (

EVEO: Electric Vehicle Engineering Officec(Ford).

EVM: Error Vector Magnitude; the length ofa vector between the ideal state and the actual state measured.  Itis plotted versus time.p

Last Update:12/13/03
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