E

E1
A European standard for a 2048Mbit/s communications link, usually comprising 32 timeslots of 64kbit/s data or signalling information.

Echo suppression
When a signal is transmitted and received over separate go and return paths is re-combined into a single bi-directional path, for example the 2 to 4 wire conversion in a telephone, some of the signal will be reflected by an imperfect impedance match in the converter (hybrid). This will be heard at the distant end as an echo. Echo suppression is the processing of signals to minimise the echo and help to separate the received signal from the transmitted signal.

Edge of Coverage
The boundary of the coverage is the satellite footprint. This is usually a gradual transition, but to illustrate the footprint, the satellite service provider will usually choose a minimum power level to act as a hard boundary.

EDI
Electronic Data Interchange, the standards and action of exchanging data for business transactions

Elevation
The angle above the horizon that the antenna makes in order to point at the satellite

Encryption
Encoding of a signal to make it unintelligible to eavesdroppers

Erlang
A unit of usage of a resource, especially a telephone network. Used when capacity planning

Eutelsat
European Telecommunications Satellite

Extranet
An IP based network connecting a community of suppliers and customers.