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Chapter
1
Typical
connection
Figure
3.
A
Typical
Connection
High and
low
speed operations
The
DCM
212
Modem
automatically synchronizes with standard speed
rates
of 300
and
1200
bits
per
second
(bps).
Switching
from
high speed
(1200 bps) to
low speed
(300 bps) opera-
tion occurs
when
the
DCM
212
receives either
the
wake-up code
in the
Tandy
protocol
mode,
or the
attention
code
in
Hayes
protocol
mode.
When
the
Modem
detects
1200
bps
after receiving
the
code
sequence,
it
will
communicate
in
high
speed.
If
it
is
awakened
at
300
bps,
low
speed operation
will
be
used.
The
originating station
always determines the speed of
operation.
If
you
wake up
the
DCM
212
in
low speed
mode
intending
to
call
a
high
speed
modem,
the
DCM
212
will select
300-bps operation
none
the
less
if
that
modem
has low-speed
detection
circuitry.
Otherwise, the
DCM
212
must
be
set
to
high speed before
calling
a remote
modem.
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