Glossary Section "E" ( Definitions )
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)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.
EAD Ethernet Access Device
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.
EIA Electronic Industries Association. A national trade organization that publishes hardware oriented standards for data communications.
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.
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
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.
EUUG European UNIX Users Group. Now called EurOpen.
EVC Ethernet Virtual Circuit
EVPL Ethernet Virtual Private Line
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.