Controlling Link Speeds with &N and &U 8-5Limiting the LowestPossible ConnectSpeedThe &U command allows you to limit the lowest possible connect speed.If a remote modem attempts to connect to your Business Modem at aspeed lower than &U, your Business Modem will not allow it to connect.See the table in the section &N and &U Command Values for connectspeed values.Limiting a Range ofPossible ConnectSpeedsBy setting &N and &U values, you can limit the range of speeds at whichyour Business Modem connects. If a remote modem does not connect toyour Business Modem at a range between the speeds designated by the&N and &U commands, your Business Modem will not allow it toconnect.The link speed associated with the &U argument CANNOT be greaterthan 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 isLowest possible connectspeedAT&U=x A value from 0 to 32If &U And &N Then your modemEquals zero Equals zero Connects at the highest possiblespeed.Equals zero Is greater than zero Connects at the &N speed only.Is greater than zero Is greater than zero andgreater than &UConnects at the highest possiblespeed in the range from &U to &N.
