AT&T 3.0 manual Lan, Ldn, Led

Glossary

L

LAN	(local area network) Arrangement of interconnected
	personal computers or terminals, sometimes accessing a
	host computer, sometimes sharing resources like files and
	printers.
LDN	(Listed Directory Number)
LED	(light-emitting diode) Semiconductor device that produces
	light when voltage is applied; light on a telephone.
line	Connection between extensions within the
	communications system or loop-start communications
	path with CO; often, however, used synonymously with
	trunk.
line and trunk	Assignment of lines and trunks connected to the system
assignment	control unit to specific buttons on each telephone.
line coding	Pattern that data assumes as it is transmitted over a
	communications channel.
line compensation	Adjustment for the amount of cable loss in decibels (dB),
	based on the length of cable between a 100D module and
	a channel service unit (CSU) or other far-end connection
	point.
line/trunk	Refers to inside system lines and outside trunks in general
	terms. See also line and trunk.
line/trunk jack	Physical interface on a module in the control unit for
	connecting an outside trunk to the communications
	system. Also called “trunk jack. ”
line/trunk and	Module on which the jacks for connecting central office
extension module	lines/trunks and/or the jacks for connecting the extensions
	are located.

GL-20Maintenance and Troubleshooting