3Com U.S. Robotics 56K Winmodem Manual page 42

character
A representation, coded in binary digits, of
a letter, number, or other
symbol.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 between fax
application programs and faxmodems for
sending and receiving faxes.
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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
A type of communications in which
computers are able to exchange data over an
electronic medium.