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Glossary
5.375 x 8.375 ver 2.4.0
DSR signal: This signal tells the personal computer whether the
modem is ready for communication.
DTR signal: This signal tells the modem whether the personal
computer is ready for communication.
duplex: The method used to transmit data in both directions
between two devices. Synonymous with full duplex. See also half
duplex, full duplex.
E
echo: Displays keyboard entry on the computer terminal.
EIA: Electronic Industries Association is a manufacturers group
that sets standards for data communications equipment.
error control: Detection of errors in data communication. Requests
retransmission of data in which errors were found.
Error control: Detection of errors in data communication. Requests
retransmission of data in which errors were found.
escape: 1) To cancel the task currently in progress. 2) A code
(ASCII code 27, generated by the Esc key) telling the computer
that what follows are commands, not data. Used with peripheral
devices such as printers and modems.
Escape control: This code is used to return to the command state
without disconnecting the line when the internal modem is
online.
F
FIFO: First-In/First-Out means the first data that enters a buffer is
the first to be retrieved.
Fallback: Reduction of a modem’s speed. If the remote modem
cannot communicate as fast as the local modem, the local modem
will reduce its speed.
firmware: A set of instructions built into a chip to control its
activities.