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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Glossary
Page GL-17
K
L
kbps (kilobits per second)
Key mode 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 inside calling.
See also
Behind Switch mode
and
Hybrid/PBX mode.
LAN (local area network) Arrangement of interconnected
personal computers or terminals, sometimes accessing a
host computer, sometimes sharing resources such as 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; often, however, used
synonymously with
trunk
.
line and trunk
assignment
Assignment of lines and trunks connected to the system
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 lines/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 line/trunk to the communications
system. Also called “trunk jack.”
line/trunk and
extension module
Module on which the jacks for connecting central office
lines/trunks and/or the jacks for connecting the extensions
are located.
local dial plan In a system that is part of a
private network
, a list of
extension ranges that the local system refers to in order to
route local
intersystem calls via UDP
.
local extension In a system that is part of a
private network
, an extension
that is listed in the system’s
local dial plan
.
local host
computer access
A method for connecting an extension jack to an on-site
computer for data-only calls through a
modem
or
ISDN
terminal adapter
.