US Robotics SportsterVoice User Manual page 28

Byte
A group of binary digits stored and operated upon as a unit. A byte may have a coded value equal to a character
in the ASCII code (letters, numbers) or have some other value meaningful to the computer. In user documentation,
the term usually refers to 8-bit units or characters. 1 kilobyte (Kbyte) is equal to 1.024 bytes or characters; 640
Kbytes indicates 655.360 bytes or characters.
Carrier
A tone signifying a connection the modem can alter to communicate data across telephone lines.
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 and 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 facsimile application programs and facsimile modems for sending and
receiving faxes.
Cyclic Redundancy Checking (CRC)
An error-detection technique consisting of a cyclic algorithm performed on each block or frame of data by both
sending and receiving modems. The sending modem inserts the results of its computation 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.
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