Robotics Sportster Flash x2 Guía de usuario descargar pdf (Pagina 35)

User’s Guide & Reference 31

buffer

A memory area set aside to be used as temporary storage during

input and output operations. An example is the modem's command

buffer.

byte

A group of binary digits stored and operated upon as a unit. In

user documentation, the term usually refers to 8-bit units or

characters. One kilobyte (KB) is equal to 1,024 bytes or characters;

640 KB 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/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.

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Robotics Sportster Flash x2 Guía de usuario Pagina 35