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COURIER HIGH SPEED MODEMS
Register
Default
Function
S15
*
0 Bit-mapped register. To set
the
register,
see the instructions for S13.
Bit
Value
Result
0 1 Disable
the
modem's
extra
high-frequency
equalization
if
it causes
problems
on
shorter-
link
calls-HST
modems
only
1 2 Disable online fallback
2 4 Disable 450
bps
back
channel
3 8 Reset non-ARQ
mode
Transmit
buffer from 1.SK bytes to 128
*
4
16
Disable
MNP
Level
4;
retrans-
mitting
the
larger Level 4
data
blocks
may
be
a
problem
if
you
expect a
great
number
of
errors
during
a call
5 32 Set backspace key to delete
6 64 Some earlier 2400-bps
MNP
modems,
not
made
by
USRobotics
or
Microcom,
were
not
fully compatible
with
the
MNP
protocol.
If
you
have
difficulty
making
a successful
2400-bps
MNP
connection
with
a
remote
MNP
modem,
it
may
be
because of this incompati-
bility. Set
S15
to
64
and
try
again
to
make
the
connection.
7 128
Custom
applications
only
The
default
1.SK
byte
non-ARQ buffer allows
data
transfer
with
X-
and
Ymodem-type file transfer protocols
without
using
flow control.
The 128-byte
option
allows
remote
users
with
slower
modems
to
stop
data
you're
transmitting from scrolling off
their
screens.
When
remote
users
send
your
computer
an
XOFF (Ctrl-S)
and
you
stop
transmitting, the
data
in
transit from
your
modem's
buffer
doesn't
exceed
the
size of their screen.
Summaries and Tables 8-15
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