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COM1, COM2, COM
etc. The communications ports found on PCs and other
apparatus. The modem must be connected to the appropriale communications
port before data transmission can take place
Command
The mode of the modem such that it accepts mode commands from the
terminal/computer.
D
DCD
Carrier wave detection. The signal sent from the modem to the terminal with
information on the received carrier wave
Default
Preselected values or settings that have been chosen from the factory, and
considered as a good base to start from
Demodulation
A process that extracts information that has formerly been merged together with
a carrier wave. See under modulation
DTE
Date Terminal Equipment
(Data terminal. PC or data apparatus)
DOTMF
Dual-Tone Multi-frequency signalling See Tone signalling
F
Full duplex
A communications channel capable of simultaneous transmission in both
directions.
H
Half duplex
A communications channet capable of transmission in both directions, but only
in one direction at time
I
ITU-T
The International Telecommunication Union was formerly CCITT
ITU-T is in
charge of modem standards
Main channel
The main channel in a data connection which transfers data at full transmission
speed. (See Return Channel)
16-10
LZTR104006 1.00
Zat 14.4/14.4-7 and
19.2/19.2-7
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