HP Pavilion N3110 Using Instructions page 15

Selecting Modem Modes
If you have trouble connecting to certain modems, you can try forcing the internal modem to
certain modulations and connect rates. To select a modulation, use the +MS command. In
addition to selecting the modulation, this command allows you to enable or disable automode and
specify the lowest and highest connection rate. The format of the command is as follows:
+MS= <mode>,<automode>,<min_rate>,<max_rate>
The +MS command should be used as part of the modem initialization sequence in your
communications program.
The following table indicates the mode value to use for each supported modulation as well as the
possible rates that can be used for each modulation.
<mode>
0
1
2
3
9
10
11
17
64
For example, to force the internal modem to connect with the V.34 modulation:
1. Click Start, Settings, Control Panel.
2. Double-click Modems.
3. Click Properties.
4. Click the Connection tab.
5. Click Advanced.
6. In the "Extra settings" field, type AT+MS=11 and click OK.
Most Windows modem applications use the modulation command in the "Extra settings" field as
part of the modem initialization.
The following table lists the other +MS parameters along with the acceptable values for each
parameter.
Modulation
v.21
v.22
v.22bis
v.23
v.32
v.32bis
v.34
X2, v.90
Bell 103
Possible Rate (bps)
300
1200
2400, 1200
1200, 300
9600, 4800
14400, 12000, 9600, 7200,
4800
33600, 31200, 28800, 26400,
24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200,
4800, 2400
57,333–33,333
300
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