Instruction manual
Glossary
dual-tone
multifrequency
signaling
E&M Signaling
EIA
Electronic
Switching
System
endpoint
ESF
ESS
expansion
carrier
extended
superframe
format
facility
Facility
Restriction
Level
factory setting
dialed digit or character, and each composed of two voice-
band frequencies.
See DTMF signaling.
Trunk supervisory signaling, used between two
communications systems, in which signaling information is
transferred through two-state voltage conditions (on the
E and M leads) for analog applications and through two bits
for digital applications. Used in tie trunks.
(Electronic Industries Association) A trade association of the
electronic industry that establishes electrical and functional
standards.
See ESS.
The final destination in the path of an electrical or
telecommunications signal.
(Extended superframe format) A framing format consisting
of individual frames of 24 eight-bit slots and one signal bit
(193 bits) in a 24-frame extended superframe. See also D4
framing format.
(Electronic Switching System) A class of central office
switching systems developed by AT&T in which the control
functions are performed principally by electronic data
processors operating under the direction of a stored
program.
A carrier added to the control unit when the basic carrier
cannot house all of the required modules. An expansion
carrier houses a power supply and up to six additional
modules.
See ESF.
The equipment constituting a telecommunications path
between the communications system and the telephone
company central office.
See FRL.
The default state of a device or feature if an optional setting
is not programmed by the user or system manager.
GL-10 Glossary