AT&T MERLIN LEGEND Release 3.1 System Manager's Manual page 400

Glossary
L
LAN
LDN
LED
line
line and trunk
assignment
line/trunk
line/trunk jack
line/trunk and
extension module
local host computer
access
local loop
logical ID
loop-start trunk
(local area network) Arrangement of interconnected
personal computers or terminals, sometimes accessing a
host computer, sometimes sharing resources such as 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.
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 .
The two-way connection between a customer premises
and the central office (CO).
Unique numeric identifier for each extension and line/trunk
jack in the system control unit.
Trunk on which a closure between the tip and ring leads is
used to originate or answer a call. High-voltage 20-Hz AC
ringing current from the central office signals an incoming
call.
System Manager's Guide
GL–13