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duplex
Indicates a communications channel capable of carrying signals in both
directions. See half duplex, full duplex.
Electronic Industries Association (EIA)
Group which defines electronic standards in the U.S.
error control
Various 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).
facsimile
A method for transmitting the image on a page from one point to
another. Commonly referred to as fax.
fax mode
The mode used by a modem to send and receive data in 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 extended data commands &Hn,
&In, &Rn in the “Technical Reference” chapter of this manual.
frame
A data communications term for a block of data with header and trailer
information attached. The added information usually includes a frame
number, block size data, error-check codes, and Start/End indicators.
full duplex
Signals can flow in both directions at the same time over one line. In
microcomputer communications, this may refer to the suppression of the
online local echo.
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