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G
LOSSARY
7-4
detect phase
In the ITU-T V.42 error-control protocol , the first
stage in establishing if both modems attempting to
connect have
V.42 capability.
dictionary
The term used for compression codes built by the
V.42 bis data compression algorithm.
digital loopback
A test that checks the modem's RS-232 interface
and the cable that connects the
terminal or
computer and the modem. The modem receives data
(in the form of
digital signals ) from the computer
or terminal, and immediately returns the data to the
screen for verification.
digital signals
Discrete, uniform signals. In this manual, the term
refers to the
binary digits 0 and 1.
DTE
Data Terminal (or Terminating) Equipment. A
computer that generates or is the final destination of
data.
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 .