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G
LOSSARY
7-3
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.
data compression table
A table containing values assigned for each
character during a call under MNP 5 data
compression. Default values in the table are
continually altered and built during each call: The
longer the table, the more efficient
throughput
gained.
data mode
Mode used by a modem when sending and receiving
data files.
DCE
Data Communications (or Circuit-Terminating)
Equipment, such as dial-up modems that establish
and control the data link via the telephone network.
default
Any setting assumed, at startup or reset, by the
computer's software and attached devices. The
computer or software will use these settings until
changed by the user or other software.