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S
S-Registers
Registers that contain information affecting the modem
parameters.
signal ground
Pin 7 of an EIA RS-232 interface.
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
ter
Latin for "thrice." Used to distinguish a revised standard or
recommendation from other versions. For example: V.27 ter.
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. Pin 2 of a EIA RS-232 interface that is used by
the computer to transmit data to the modem. Conversely, the
modem uses Pin 2 to receive data from the computer.
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