Thanks for the reply Seth.
I found the minimum and maximum transmit rates but I am looking for where I configure the mandatory and supported data rates. For example, I may want to configure the data rates as follows:
* Not Supported - 1, 2, 5.5, 6, 9, 11 Mbps
* Mandatory (Basic) - 18 and 36 Mbps
* Supported - 12, 24, 48, 54 Mbps