AT&T MERLIN LEGEND Release 3.1 System Programming Manual page 863

Glossary
Key mode
L
LAN
LDN
LED
line
line and trunk
assignment
line coding
line compensation
line/trunk
line/trunk jack
line/trunk and
extension module
local host computer
access
local loop
GL–16
System Programming
One of three modes of system operation, in which the
system uses personal lines on line buttons for outside calls,
with a separate interface ( ICOM buttons ) for internal
calling. See also Behind Switch mode and Hybrid/PBX
mode.
(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; 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.
A method for connecting an extension jack to an on-site
computer for data-only calls through a modem or data
module.
See access line.