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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Glossary and Abbreviations
Page GL-21
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.
emergency transfer
If a major system failure occurs, automatic transfer is initiated to a group of telephones capable of
making outgoing calls. The system operates in this mode until the failure is repaired and the
system automatically returns to normal operation. Also called power-failure transfer.
EMI
Electromagnetic interference
end-to-end signaling
The transmission of touch-tone signals generated by dialing from a voice terminal to remote
computer equipment. These digits are sent over the trunk as DTMF digits whether the trunk
signaling type is marked as tone or rotary and whether the originating station is tone or rotary.
Example: a call to a voice-mail machine or automated-attendant service. A connection is first
established over an outgoing trunk. Then additional digits are dialed to transmit information to be
processed by the computer equipment.
enhanced private-switched communications service (EPSCS)
An analog private telecommunications network based on the No. 5 crossbar and 1A ESS that
provides advanced voice and data telecommunications services to companies with many
locations.
EPN
Expansion-port network
EPROM
Erasable programmable read-only memory
EPSCS
Enhanced Private Switched Communications Services
ERL
Echo return loss
Erlang
A unit of traffic intensity, or load, used to express the amount of traffic needed to keep one facility
busy for one hour. One Erlang is equal to 36 CCS. See also CCS or hundred call seconds
.
ESF
Extended superframe format
ESPA
European Standard Paging Access
ETA
Extended Trunk Access; also Enhanced Terminal Administration