MERLIN LEGEND Communications System Release 7.0
System Programming
555-670-111
Issue 1
April 1999
Glossary
GL-17
J
K
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ISDN
Integrated Services Digital Network
. Public or private
network that provides end-to-end digital connectivity for all
services to which users have access by a limited set of
standard multipurpose user and
network
interfaces
;
provides digital circuit-switched or packet-switched
connections within the network and to other networks for
national and international digital connectivity.
ISDN 7500B Data
Module
Data communications device that allows connection
between an RS-232
DTE
device and the control unit by
MLX extension jacks on an MLX module.
ISDN Terminal
Adapter
Integrated Services Digital Network Terminal Adapter
. A
device that connects the communications system with
data
terminal equipment (DTE).
ISDN Terminal
Adapter Data
Station
Type of data station that includes an ISDN terminal adapter
as its DCE. It may also include an MLX telephone for
simultaneous voice and data (ISDN terminal adapter data-
only station). These data stations connect to MLX
extension jack modules for digital transmission of data over
a DS1 facility.
Jack
Physical connection point to the system for a telephone,
line/trunk, or other device. Also called “port.”
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
and
.
LAN
Local Area Network
. Arrangement of interconnected
personal computers or terminals, which sometimes access
a host computer, and 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
.
