US Robotics Courier V.Everything x2 Addendum, Руководство пользователя

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Controlling Link Speeds with &N and &U
You can use the &N and &U commands to control link speeds. Couriers
without x2 can still use the &N and &U commands, but can only control link
speeds up to 33.6 kbps.
Controlling Link Speeds
You can use the &N and &U commands to control the link speeds of your
Courier I-modem with x2. Use the following table to determine how to use &N
and &U commands:
To limit the Use
Highest possible connect speed &N
Lowest possible connect speed &U
Range of possible connect speeds &N and &U
Table 2 - Using Link Speeds
Note: The default values for &N and &U are 0. If you change these values, you will
limit the speeds at which you can connect. U.S. Robotics recommends that you do not
alter these values.
Limiting the Highest Possible Connect Speed
The &N command allows you to limit the highest possible connect speed. If a
remote modem connects to your Courier I-modem with x2 at a speed higher
than &N, your Courier I-modem with x2 will not allow it to connect.
To limit the Use this command
Highest possible connect speed to 33600 &N=16
Limiting the Lowest Possible Connect Speed
The &U command allows you to limit the lowest possible connect speed. If a
remote modem connects to your Courier I-modem with x2 at a speed lower than
&U, your Courier I-modem with x2 will not allow it to connect.
To limit the Use this command
Lowest possible connect speed to 48000 &U=24