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Glossary
L
LAN
LDN
LED
line
line and trunk
assignment
line coding
line compensation
line/trunk
line/trunk jack
line/trunk and
extension module
(local area network) Arrangement of interconnected
personal computers or terminals, sometimes accessing a
host computer, sometimes sharing resources like files and
printers.
(Listed Directory Number)
(light-emitting diode) Semiconductor device that produces
light when voltage is applied; light on a telephone.
Connection between extensions within the
communications system or loop-start communications
path with CO; often, however, used synonymously with
trunk.
Assignment of lines and trunks connected to the system
control unit to specific buttons on each telephone.
Pattern that data assumes as it is transmitted over a
communications channel.
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.
Refers to inside system lines and outside trunks in general
terms. See also line and trunk.
Physical interface on a module in the control unit for
connecting an outside trunk to the communications
system. Also called “trunk jack. ”
Module on which the jacks for connecting central office
lines/trunks and/or the jacks for connecting the extensions
are located.
GL-20 Maintenance and Troubleshooting