User`s guide

GLOSSARY
55
start/stop bits
These signaling bits are 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. This device 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. This mode is 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 it 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, 9600 bps,
and 7200 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.
V.22 bis
An ITU-T standard for modem communications at
2400 bps. The standard includes an automatic link
negotiation fallback to 1200 bps and compatibility
with Bell 212A/V.22 modems.