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G
LOSSARY
115
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 commands
&Hn, &In, &Rn.
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.