A2-6 429850
Trend AuroraPlus User Guide
I
Integrated Services A telecommunications network designed to
Digital Network transmit and process all types of voice and data
(ISDN) traffic using digital transmission and switching.
ITU International Telecommunications Union.
L
Layer In the OSI model, a layer is a collection of related
functions within a communications system with a
defined service interface to layers above and below.
LCD A Liquid Crystal Display, such as the screen on
AuroraPlus.
LED Light Emitting Diode.
Logical Channel A means of identifying the data link that is used
Number (LCN) across an X.25 network to connect the source and
the destination.
Loopback Data received on the Rx channel of a circuit is re-
transmitted on the Tx channel of the same circuit.
Low Level The service provided at the lower layers.
Compatibility
(LLC)
M
MHS Message Handling System
Modem A device which converts digital signals into analogue
tones which can be passed through the telephone
network. A modem at the receiving end reverses this
process to recreate the original digital signal.
Multiple Subscriber A supplementary service available on Point-to
App02.P65 01/05/01, 09:206
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