E+M

Another name for DC5

EDGE

Enhanced Data Rates for Global Evolution
 - A faster version the Global System for Mobile (GSM) wireless service designed to deliver data at rates up to 384 Kbps and enable the delivery of multimedia and other broadband applications to mobile phone and computer users.

EMC

Electromagnetic Compatibility
 - The ability of electrical and electronic equipment to co-exist without unacceptable interference.

EMC Directive

The European Directive containing legislation to support the application of rf emission, conducted disturbance and noise immunity standards.

EMI

Electromagnetic Interference

Encryption

A method used to secure data that is transferred over the Internet by scrambling it in such a way that only the intended recipient of the message can read its contents.

Equipment Cable

A cable connecting equipment to a distributor.

Equipment Room

The room in which voice and data common equipment (for example, a Mitel switch & Cisco Switches) is housed, protected, and maintained.

Equipment Subsystem

The part of a premises distribution system that includes the cable and distribution components in an equipment room and that interconnects system-common equipment, other associated equipment, and cross connects.

Ethernet

A common method of networking computers in a LAN. A local-area network (LAN) protocol developed by Xerox Corporation in cooperation with DEC and Intel in 1976.

Euro ISDN

A name for ISDN as defined by the relevant European ETSI standards.

Extranet

An Intranet that is accessible to computers that are not physically part of a company's own private network, but that is not accessible to the general public - for example, to allow vendors and business partners to access a company web site.

Extension Lock

A facility to prevent unauthorised phone use. An extension can be locked by entering a code and unlocked by entering a password. When locked the phone is subject to call barring, perhaps restricting it to internal and emergency service calls only.

Ethernet - 10 Gigabit

A version of Ethernet operating at 10,000 Mbit/s over optical fibre. Operation over twisted pair cabling is also under study.