US Robotics 56K Series Manual page 49

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.
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
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