112 Glossary
Flow control: Flow control ensures smooth data communication. If operating speed differs between the personal computer and modem or between your modem and a remote modem and if the remote station runs short of buffer capacity, a transmission halt request is sent from the receiver to the transmitter. When the receiver has enough buffer capacity to resume receiving data, a transmission restart request is sent. There are two ways of flow control, XON and OFF control codes and CTS and RTS signals.
frequency: The number of times a signal repeats an identical cycle within a certain time period.
full duplex: A type of data transmission in which data flows between two devices in both directions simultaneously. See also half duplex.
G | gigabyte (GB): A unit of data storage equal to 1,073,741,824 bytes | |
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| (1024 x 1024 x 1024 bytes). See also byte. | |
| Guard time: An interval before and after an escape sequence that | |
| prevents the modem from interpreting the escape sequence as | |
| data. | |
H | half duplex: A type of data transmission in which data flows | |
between two devices in one direction at a time. See also full | ||
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| duplex. | |
| handshake: After a telephone line is connected from one station to | |
| another, some signals are exchanged according to the | |
| Bell standard to confirm that the standard is the same between the | |
| calling and called stations prior to starting data communication | |
| between them. This exchange of signals is called handshake. | |
| hangup: Hangup means disconnecting a telephone line to terminate | |
| communication | |
I | input: Information received by a computer from a storage device | |
such as a disk, or an input device such as the keyboard. | ||
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