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Controlling Link Speeds with &N and &U
8-5
Limiting the Lowest
Possible Connect
Speed
The &U command allows you to limit the lowest possible connect speed.
If a remote modem attempts to connect to your Business Modem at a
speed lower than &U, your Business Modem will not allow it to connect.
See the table in the section
&N and &U Command Values
for connect
speed values.
Limiting a Range of
Possible Connect
Speeds
By setting &N and &U values, you can limit the range of speeds at which
your Business Modem connects. If a remote modem does not connect to
your Business Modem at a range between the speeds designated by the
&N and &U commands, your Business Modem will not allow it to
connect.
The link speed associated with the &U argument CANNOT be greater
than the link speed associated with &N argument.
Use the following table to understand the relationship between &U and
&N commands:
To limit the Use this command Where x is
Lowest possible connect
speed
AT&U=x
A value from 0 to 32
If &U And &N Then your modem
Equals zero Equals zero Connects at the highest possible
speed.
Equals zero Is greater than zero Connects at the &N speed only.
Is greater than zero Is greater than zero and
greater than &U
Connects at the highest possible
speed in the range from &U to &N.