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Glossary Section "E" ( Definitions )

Guide -  Select first letter of word:
0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

E&M Earth and Magnet or Ear and Mouth were the original meanings for this acronym. E&M ports are generally connected to an E&M interface on a PBX. Unlike a POTs line, E&M does not have a DC offset on the talk path. The talk path is on a set of wires separate from the -48 VDC signaling lead wires.  (more detail)

E1 The basic building block for European multi-megabit data rates, with a bandwidth of 2.048Mbps. The European equivalent of T1 but at a higher speed. See T1.

E1/FE1 This indicates that the equipment will accommodate a full E1 or a fractional portion thereof.

E2 A European standard for transmitting data at 8.448 Mbps.

E3 A European standard for transmitting data at 34 Mbps. The European counterpart to an T3 .

EARN European Academic Research Network. A network using BITNET technology connecting universities and research labs in Europe. Now called TERENA after the merger with RARE. See TERENA

EAD Ethernet Access Device

EBCDIC Extended Binary Coded Decimal Interchange Code developed by IBM

EBONE European Backbone. A pan-European network backbone service.

ECMA European Computer Manufacturers Association. A group of computer vendors that have performed substantive pre-standardization work for OSI.

EDO Extended Data Output memory is a type of DRAM that is faster than conventional DRAM. EDO memory can begin accessing the next block of memory while simultaneously outputting the previous data to the CPU. This results in a significant increase in performance.

EFF Electronic Frontier Foundation A foundation established to address social and legal issues arising from the impact on society of the increasingly pervasive use of computers as the means of communication and information distribution.

EGP Exterior Gateway Protocol. A reachability routing protocol used by gateways in a two-level internet. There is also a routing protocol called EGP defined in RFC 904. See core gateway.

EIA Electronic Industries Association. A national trade organization that publishes hardware oriented standards for data communications.

EIA-232 is a specification of the EIA for what was previously known as RS232. Frequently these terms are  inter-changed. 

EKTS Electronic Key Telephone Service

EMI Electrical Magnetic Interference

EFM Ethernet in the First Mile

EMS Element Management System

encapsulation The technique used by layered protocols in which a layer adds header information to the protocol data unit (PDU) from the layer above. As an example, in Internet terminology, a packet would contain a header from the physical layer, followed by a header from the network layer (IP), followed by a header from the transport layer (TCP), followed by the application protocol data.

encryption Encryption is the manipulation of a packet's data in order to prevent any but the intended recipient from reading that data. There are many types of data encryption, and they are the basis of network security. See DES, DEK, RSA, PGP.

end system An OSI system which contains application processes capable of communicating through all seven layers of OSI protocols. Equivalent to Internet host.

entity OSI terminology for a layer protocol machine. An entity within a layer performs the functions of the layer within a single computer system, accessing the layer entity below and providing services to the layer entity above at local service access points.

EPABX  Electronic Private Automatic Branch Exchange

Erlang  is a concurrent functional programming language developed by the Computer Science Laboratory of Ericsson.

ERPS Ethernet Ring Protection Switching - G.8032 

ES-IS End System to Intermediate System protocol. The OSI protocol used for router detection and address resolution.

ESF Extended Super Frame allows for on-line diagnostics without disrupting the data stream.  24 frames are strung together to form and Extended Super Frame. 

ESS Electronic Switching System

Ethernet A 10Mbps standard for LANs, initially developed by Xerox, and later refined by Digital, Intel and Xerox (DIX). All hosts are connected to coaxial cable where thy contend for network bandwidth using a Carrier Sense Multiple Access with Collision Detection (CSMA/CD) paradigm. See l0Base-T.

Ethernet Meltdown An event that causes saturation, or near saturation, on an Ethernet. It usually results from illegal or misrouted packets and typically lasts only a short time.

EUnet European UNIX Network. (Original name). Now a major European Internet Service provider.

EUUG European UNIX Users Group. Now called EurOpen.

EVC Ethernet Virtual Circuit

EVPL Ethernet Virtual Private Line

EWOS European Workshop for Open Systems. The OSI Implementors Workshop for Europe.

Extranet is a term referring to the use of the Internet to securely share information with suppliers, branches, customers, or others of its choice. An extranet is essentially an extension of a company's intranet.

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Last modified: June 13, 2018
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