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Glossary
S
serial port
The serial port is the connection between the PC and its
attached modem.
S-Registers
Registers that contain information affecting the modem
parameters. All S-Registers must be preceded by the AT prefix.
synchronous transmission
Data transmission that is synchronized by timing signals.
Characters are sent at a fixed rate. This type of transmission is
more efficient than asynchronous transmission.
T
tone dialing
One of two dialing methods, in which telephone numbers are
sent as tones across the telephone lines.
training
A process where two modems try to establish a connection over
the telephone line.
TXD
Transmit Data. A signal that is used by the computer to transmit
data to the modem. Conversely, the modem uses RXD to
receive data from the computer.
Issue 2
May 1995
GL-9
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