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USRobotics V.34 User Manual

Page 118

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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.