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Glossary
5.375 x 8.375 ver 2.4.0
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
(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
duplex.
handshake: After a telephone line is connected from one station to
another, some signals are exchanged according to the ITU-T or
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.