AT&T MERLIN LEGEND Release 3.0 Installation Manual page 584

Glossary
ESF
ESS
expansion carrier
extension
extension jack
extension
programming
extended superframe See ESF.
format
F
facility
GL–14 Maintenance and Troubleshooting
(extended superframe format) 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) Class of central office (CO)
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.
Carrier added to the control unit when the basic carrier
cannot house all of the required modules. Houses a power
supply and up to six additional modules.
An endpoint on the internal side of the communications
system. An extension can be a telephone with or without
an adjunct. Also called "station. " See also data station.
An analog, digital, or tip/ring physical interface on a
module in the control unit for connecting a telephone or
other device to the system. Also called "station jack. "
Programming performed at an extension to customize
telephones for personal needs; users can program
features on buttons, set the telephone ringing pattern, and
so on. See also centralized telephone programming and
system programming.
Equipment (often a trunk) constituting a
telecommunications path between the system and the
telephone company central office (CO).