Administrator's Guide

E
Issue 5 October 2002 1969555-233-506
E
E1
A digital transmission standard that carries traffic at 2.048 Mbps. The E1 facility is divided into 32 channels
(DS0s) of 64 kbps information. Channel 0 is reserved for framing and synchronization information. A
D-channel occupies channel 16.
E & M
Ear and mouth (receive and transmit)
EA
Expansion archangel
EAL
Expansion archangel link
ear and mouth (E & M) signaling
Trunk supervisory signaling, used between two communications systems, whereby signaling information is
transferred through 2-state voltage conditions (on the E and M leads) for analog applications and through a
single bit for digital applications.
EAS
See "Expert Agent Selection".
ECC
Error Correct Code
ECMA
European Computer Manufacturers Association
ECT
Enhanced Call Transfer
EEBCDIC
Extended Binary-Coded Decimal Interexchange Code
EFP
Electronic power feed
EI
Expansion interface
EIA
Electronic Industries Association
EIA-232
A physical interface specified by the EIA. EIA-232 transmits and receives asynchronous data at speeds of up
to 19.2 kbps over cable distances of up to 50 feet. EIA-232 replaces RS-232 protocol in some DEFINITY
applications.
electronic tandem network (ETN)
A tandem tie-trunk network that has automatic call-routing capabilities based on the number dialed and the
most preferred route available. Each switch in the network is assigned a unique private network office code
(RNX), and each voice terminal is assigned a unique extension.
Electronics Industries Association (EIA)
A trade association of the electronics industry that establishes electrical and functional standards.