USRobotics V.34 - Manual (Page 118)

COURIER HIGH SPEED MODEMS
B-24 Summaries and Tables
Register Default Function
S33 0 Setting this register to 1 (S33=1) enables a
reduced packet size.
S34 0 Bit-mapped register. See instructions for
S13.
Bit Value Result
0 1 Disable V.32 bis. Used for
troubleshooting; U.S. Robotics'
Technical Support may require
that you disable V.32
bis for
testing purposes.
1 2 Disable the modem's
enhanced, proprietary V.32
bis
modulation. Used for
troubleshooting.
2 4 Disable the faster retrains that
occur during proprietary V.32
terbo modulation. Used for
troubleshooting.
3 8 Enable V.23. Required for
some British connections.
4 16 Change MR LED to DSR.
5 32 Enable MI/MIC; see Appendix
G.
6 64 Disable the remote access busy
message.
7 128 Disable V.32 terbo.
S35 − S37 0 Reserved.
S38 0 Sets the duration, in seconds, before a
forced hang-up and clearing of the
Transmit buffer, when DTR drops during
an ARQ call. This is provided to allow
time for a remote modem to acknowledge
receipt of all transmitted data. Default =
0: the modem immediately hangs up
when DTR drops. If the modem receives
the ATH command, it ignores S38 and
immediately hangs up.