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Glossary
S
S-Registers
Registers that contain information affecting the modem
parameters. All S-Registers must be preceded by the AT prefix.
serial port
The serial port is the connection between the PC and its
attached modem.
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.
GL-10
Issue 1 November 1994
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