Westermo ID-90 - Manual (Page 116)

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LAPM
Link Access Procedure for Modems. An error correction method used in transmissions via
PTT modems.
LED
Light-Emitting Diode. A semi-conductor which emits light when it receives an electrical
current. Used as indicators.
LLA
Low Layer Attribute.
LLC
Low Layer Compatibility.
LT
Line Terminal, the telephone station counterpart to the NT1.
ML-PPP
Multi Link Point to Point.
MNP
Microcom Networking Protocol. Several methods for error correction and data compres-
sion for PTT modems.
Modem
Acronym of the words modulator and demodulator. Modulates or transforms the signal
from computer equipment into electrical signals for transmission. The receiver has a simi-
lar modem which retransform the signal, demodulation.
MSN
Multiple Subscriber Number.
N-ISDN
Narrowband-Integrated Service Digital Network.
NT
Network Termination.
NT1
Network termination 1 (NT1), functional group includes functions broadly equivalent to
layer 1 (physical) of the OSI reference model.
NT2
Network termination 2 (NT2), This functional group includes functions broadly equivalent
to layer 1 and higher layers of the Recommendation X.200 reference model. PABXs, local
area networks, and terminal controllers are examples of equipment or combinations of
equipment that provide NT2 functions.
Off Hook
Term used to describe when the modem is not connected to a telephone line.