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Glossary of broadband terminology: E

E-1

The European equivalent of a T-1 circuit. It is a term for a digital facility used for transmitting data over a telephone network at 2.048 Mbps.

E-3

The European equivalent of a T-3 circuit. It is a term for a digital facility used for transmitting data over a telephone network at 34 Mbps.

Echo Suppressor/Echo Canceller

These are active devices used by the phone company to suppress positive feedback (singing) on the phone network.They work by predicting and subtracting a locally generated replica of the echo based on the signal propagating in the forward direction. Modems deactivate these devices by sending the 2100 Hz answer tone with 180-phase reversals every 450 msec at the beginning of the connection.

Electronic Industries Association/Telecommunications Industry Association

This organization provides standards for the data communications industry to ensure uniformity of the interface between DTEs and DCEs.

Element Management System

A management system that provides functions at the element management layer.

Enterprise Network

A widely dispersed, multifaceted telecommunications network for a particular purpose or organization; a term for all of an organization's telecommunications networking services and equipment.

Ethernet

A LAN used to connect devices within a single building or campus at speeds up to 10 Mbps. Within the OSI model, Ethernet is defined at layer one (physical) and layer two (data link). Based on Carrier Sense Multiple Access/Collision Detection (CSMA/CD), Ethernet works by simply checking the wire before sending data. Sometimes two stations send at precisely the same time in which case a collision is detected and retransmission is attempted. See also 10Base-T.

Ethernet Connection

As ethernet (above) - a high-speed, direct connection to a network where an Ethernet network interface card (NIC) is installed so that the user can access any host connected to the network.