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electronic tandem
network (ETN)
Electronics Industries
Association (EIA)
emergency transfer
EMI
end-to-end signaling
enhanced private-
switched
communications service
(EPSCS)
EPN
EPROM
EPSCS
ERL
Erlang
ESF
ESPA
ETA
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.
A trade association of the electronics industry that establishes electrical and
functional standards.
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.
Electromagnetic interference
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.
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.
Expansion-port network
Erasable programmable read-only memory
Enhanced Private Switched Communications Services
Echo return loss
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
hundred call seconds
Extended superframe format
European Standard Paging Access
Extended Trunk Access; also Enhanced Terminal Administration
Electronic tandem network
on page 395.
CCS or
Issue 1.0 May 2003
ETN
405
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