Instruction manual

MERLIN LEGEND Communications System Release 5.0
System Planning
555-650-112
Issue 1
June 1997
Glossary
Page GL--11
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/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 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
.
local loop The two-way connection between a customer’s premises
and the central office (CO).
logical ID Unique numeric identifier for each extension and line/trunk
jack
in the system control unit.
loop-start line Line 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.