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G
LOSSARY
91
characters per second (CPS)
A data transfer rate generally estimated from
the
bit rate
and the
character
length. For
example, at 2400 bps, 8-bit characters with
start/stop bits
(for a total of ten bits per
character) will be transmitted at a rate of
approximately 240 characters per second
(cps). Some
protocols
, such as error-control
protocols, employ advanced techniques such
as longer transmission
frames
and
data
compression
to increase cps.
class 1 and 2.0
International standards used by fax
application
programs and faxmodems for
sending and receiving faxes.
cyclic redundancy checking (CRC)
An error-detection technique consisting of a
test performed on each block or
frame
of data
by both sending and receiving modems. The
sending modem inserts the results of its tests in
each data block in the form of a CRC code.
The receiving modem compares its results with
the received CRC code and responds with
either a positive or negative acknowledgment.
data communications
The transmission or sharing of data between
computers via an electronic medium.