3Com 1.024.1644-00 Glossary Character, Characters per second CPS, Class 1, Data communications

Glossary

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, like 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 acknowledgement.

data communications

A type of communications in which computers are able to exchange data over an electronic medium.

data compression table

A table containing values assigned for each character during a call under MNP5 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

The mode in which the faxmodem is capable of sending and receiving data files. A standard modem without fax capabilities is always in data mode.

44 56K Voice Faxmodem Internal - User’s Guide