AT&T 3.0 manual Esf, Ess

Glossary

ESF	(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.
ESS	(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.
expansion carrier	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.

extension

extension jack

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 alsodata 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. ”

extension	Programming performed at an extension to customize
programming	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.

extended superframe See ESF. format

F

facility	Equipment (often a trunk) constituting a
	telecommunications path between the system and the
	telephone company central office (CO).

GL–14Maintenance and Troubleshooting