Glossary

E

E-1
The European equivalent of the T-1 circuit that carries 30 channels of 64Kbps (per channel) along a 2.046Mbps bearer channel.
EAD
Ethernet access device
Earth station
A ground-based antenna and associated equipment for transmission and reception of telecoms signals via satellite (aka downlink or ground station).
ECTA
European Competitive Telecommunications Association
EDGE
Enhanced data rates for GSM evolution
Edge network
The access portion of the network.
Edge vehicle
A generic term for network switching or transmission equipment located at the subscriber’s first point of access and can be used for traffic grooming.
EDI
Electronic data interchange: industry standard for the electronic exchange of data such as orders and invoices between two different locations or organisations.
EGP
Exterior gateway protocol: the TCP/IP-based service used by gateways to exchange information about which systems they can reach.
Egress
Exit from a network.
ELAN
Ethernet local area network: a service type defined by the MEF used to reach out to large residential areas and requires landed copper, fibre-to-the-home (FTTH) or to the building.
EMI / EMR
Exchange message interface/exchange message record: Standard format for the exchange of telecoms message information among local exchange carriers.
Entrance facility
Point of interconnection between the local exchange carrier’s residence demarcation point and the external carrier’s point of presence. Also known as end user point of termination.
ENUM
Electronic numbering: the IETF’s draft standard to unify traditional telephony and next-generation IP networks and provide a framework for mapping and processing diverse network addresses. Effectively, it transforms the telephone number into a universal ident.
EO

End office:
1) A central office to which a telephone end user is connected/the final central office before the subscriber s telephone.
2) The central office trunking/switching entity where telephone loops are terminated for purposes of interconnection.
EoC
Ethernet over copper: uses a bonded multi-copper pair group performing as a single link to enable service providers to distribute symmetrical, high-speed         carrier-class Ethernet services of up to 45Mbps or more over existing copper infrastructure.
EoS
Ethernet-over-SDH/Sonet: uses GFP to encapsulate Ethernet and other data protocols into SDH/Sonet.
EPL
Ethernet private line: a service type defined by the MEF, whereby all the bandwidth is made available to the subscribers (as opposed to E-LAN).
EPON
Ethernet PON: an IEEE/EFM standard for using Ethernet for packet data.
Equal access
Describes the process of providing all end users with ease of access to long-distance networks using the carrier of their choice.
Equivalence of inputs
The supply of an incumbent operator’s products at the same price and under the same terms and conditions to both third-party customers as well as their own retail subsidiaries.
ERG
European Regulators Group
Erlang
Measure of traffic capacity of telecoms networks. Calculated as the ratio of the time a circuit is occupied to the total time being measured.
ESRB
Entertainment Software Rating Board: a non-profit, self-regulatory body that assigns ratings, enforces advertising guidelines and promotes responsible online privacy practices for the interactive entertainment software industry.
Ethernet
The dominant local and wide area networking standard defined as IEEE 802.3.
Ethernet over WDM
Ethernet over WDM makes use of GFP to encapsulate Ethernet into SDH.
ETSI
European Telecommunications Standards Institute
EVDO
Evolution data optimised/evolution data only
EVE Online
An MMOG in which all players co-exist in one virtual universe.
EVPL
Ethernet virtual private line
Exchange
A unit generally smaller than a Lata, established by the local exchange   carrier for the administration of communications service in a specified area (usually a city, town, or village). An exchange consists of one or more central offices.