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US Robotics COURIER - V.42 Standard; V.42 bis Data Compression

US Robotics COURIER
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V.42
COURIER HIGH SPEED MODEMS
A
CCITT
standard
for
modem
communications
that
defines a
two-stage process
of
detection
and
negotiation for LAPM
error
control. V.42 also
supports
the
MNP
error
control protocol,
levels 1-4.
V.42 bis
An
extension
of
CCITT
V.42
that
defines a specific
data
com-
pression
scheme
for
use
with
V
.42
and
MNP
error
control.
Word Length
The
number
of
bits in a
data
character
without
parity,
start
or
stop
bits.
Xmodem
The
first
of
a family of
error
control software
protocols
used
to
transfer files
between
modems.
These protocols
are
in
the
public
domain
and
are
available from
many
bulletin
board
services.
XON/XOFF
Standard
ASCII
control characters
used
to tell
an
intelligent
device to
stop
I
resume
transmitting
data. In
most
systems
typing
<Ctrl>-S
sends
the
XOFF character.
Some
devices,
including
the Courier,
understand
<Ctrl>-Q as XON;
others
interpret
the
pressing
of
any
key
after <Ctrl>-S as XON.
Glossary G-13

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