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GLOSSARY
110
ROM
Read Only Memory. Permanent memory, not user-
programmable.
serial transmission
The consecutive flow of data in a single channel. Compare
to parallel transmissions where data flows simultaneously
in multiple channels.
start/stop bits
The signaling bits attached to a character before and after
the character is transmitted during asynchronous
transmission.
terminal
A device whose keyboard and display are used for sending
and receiving data over a communications link. Differs
from a microcomputer or a mainframe in that it has little or
no internal processing capabilities.
terminal mode
Software mode that allows direct communication with the
modem. Also known as command mode.
throughput
The amount of actual user data transmitted per second
without the overhead of protocol information such as
start/stop bits or frame headers and trailers. Compare
with characters per second.
V.8
The ITU-T standard specification that covers the initial
handshaking process.
V.17 fax
An ITU-T standard for making facsimile connections at
14,400 bps, 12,000 bps, 9,600 bps, and 7,200 bps.
V.21
An ITU-T standard for modems operating in
asynchronous mode at speeds up to 300 bps, full-duplex,
on public switched telephone networks.
V.22
An ITU-T standard for modem communications at 1200
bps, compatible with the Bell 212A standard observed in
the U.S. and Canada.