USRobotics V.34 User Manual
Page 113
COURIER HIGH SPEED MODEMS
Summaries and Tables B-19
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
HST only
3
8
Reset non-ARQ mode
Transmit buffer from 1.5K
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 U.S.
Robotics 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 1.5K 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.