US Robotics 56K Series Manual page 52

duplex
Duplex indicates a communications
channel capable of carrying signals in
both directions. See half duplex, full
duplex.
Electronic Industries Association (EIA)
This association is a group which defines
electronic standards in the U.S.
error control
A variety of techniques that check the
reliability of characters (parity) or
blocks of data. V.42 and MNP error-
control protocols use error detection
(CRC) and retransmission of flawed
frames (ARQ).
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facsimile
A method for transmitting the image on
a page from one point to another. This is
commonly referred to as fax.
fax mode
The mode in which the faxmodem is
capable of sending and receiving files in
a facsimile format. See definitions for
V.17, V.27ter, V.29.
flow control
A mechanism that compensates for
differences in the flow of data into and
out of a modem or other device. See
commands &Hn, &In, &Rn.