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Glossary and Abbreviations
555-230-024GL-20 Issue 5 January 1998
DWBS
DEFINITY Wireless Business System
DXS
Direct extension selection
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.
EBCDIC
Extended Binary-Coded Decimal Interexchange Code
ECC
Error Correct Code
ECMA
European Computer Manufacturers Association
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.