User`s guide

56K Professional Message Modem44
digital signals
Signals that are discrete and uniform. In this manual, the term refers to
the
binary digits
0 and 1. These signals are in contrast with
analogue
signals
.
DTE
Data
Terminal
(or Terminating) Equipment is 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)
This association is a group which defines electronic standards in the
United States.
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
).
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.
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.