COURIER HIGH SPEED MODEMS
the slow,
or
back
channel (450 bps). The
modems
dynamically
reverse
the
channels
during
a call if
the
volume
of
data
transfer
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Asynchronous Transmission
Data
transmission
in
which
the
length
of
time
between
transmitted
characters
may
vary.
Because
the
time lapses
between
transmitted
characters
are
not
uniform,
the
receiving
modem
must
be
signaled
as to
when
the
data
bits of a character begin
and
when
they end. The
addition
of
Start
and
Stop
bits
to each character serves this
purpose.
Auto Answer
A feature
in
modems
enabling
them
to
answer
incoming
calls
over
the
phone
lines
without
the
use
of
a
telephone
receiver.
Auto Dial
A feature
in
modems
enabling
them
to dial
phone
numbers
over
the
phone
system
without
the
use
of a
telephone
transmitter.
Baud Rate
The
number
of discrete signal events
per
second
occurring
on
a
communications
channel.
Although
not
technically accurate,
baud
rate
is
commonly
used
to
mean
bit
rate.
Bisync
Binary
Synchronous
Control.
An
earlier protocol
developed
by
IBM for software applications
and
communicating
devices
operating
in
synchronous
environments.
The
protocol defines
operations
at
the
link level of communications, for example,
the
format
of
data
frames
exchanged
between
modems
over
a
phone
line. See Protocol,
HDLC,
SDLC.
Binary Digit
A
0or1,
reflecting
the
use
of a
binary
numbering
system
(only
two
digits).
Used
because the
computer
recognizes either
of
two
states, OFF
or
ON.
Shortened
form of
binary
digit
is bit.
Bit Rate
The
number
of
binary
digits,
or
bits,
transmitted
per
second
(bps).
Communications
channels
using
telephone
channel
G-2 Glossary
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