User Manual

GLOSSARY
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.