COURIER HIGH SPEED MODEMS
The
modem
is
shipped
ready
for
use
except for Transmit
Data
flow
control. This
type
of flow control is
required
for
calls
under
error
control,
and
when
the
computer
sends
data
to
the
modem
faster
than
the
modem
can
send
it
over
the
phone
link.
How
you
set
your
modem
depends
on
whether
or
not
your
machine
or
software
support
flow control,
and
what
type
of
flow control
they
allow. Use
the
guidelines
that
follow.
Recommended Settings
The following
recommended
settings will yield
the
best
data
reliability
and
throughput.
Check the quick-configuration
guide
that
came
with
the
modem
to see
if
your
communications
program
is listed
and
whether
it
supports both
a fixed
data
rate
between
the
computer
and
modem
(setting the
modem
to &Bl)
and
hardware
flow control (setting
the
modem
to
&Hl).
If
a
program
only
supports
software
flow control (XON
/XOFF
characters),
use
the Alternative Settings after this section.
If
necessary,
review
your
computer
/terminal
and
software
documentation
as well
to
see if
your
system
supports
the
recommended
settings.
If
either
your
software
or
machine
do
not,
use
the
Alternative Settings after this section.
1.
Set
your
software to
the
highest
rate
your
equipment
and
software
support:
19.2K, 38.4K,
or
57.6K bits
per
second.
This sets a
high
serial
port
rate,
that
is, the
rate
of
data
transmission
between
the
computer
and
the
modem.
2.
Set
the
software to a fixed serial
port
rate
so
that
the
computer
and
modem
maintain
the
high
rate,
regardless
of
the
rate
on
the
phone
line. Some
programs
call this
locking
the
serial
port.
3.
Set the software for
hardware
flow control. This
may
be
called RTS/CTS.
The
modem
uses
Clear to
Send
(CTS) to
control
the
data
flow from
the
computer.
This is the
most
efficient
and
reliable form of flow control.
4.
Set
the
modem
to a fixed serial
port
rate
(&Bl)
and
hardware
flow control (&H1).
Have
your
software
put
the
computer
in
Terminal
mode,
as
shown
in Step 3
of
Chapter
2, Testing
3-2 Quick Start
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