When designing a Wireless N network to support both B/G and N clients I've come up with the following:
1.) Dedicate the 5.0GHz radio for N giving you 9 non-overlapping channels to work with and allowing clients to connect at 300Mbps (when 40MHz channels).
2.) Use the 2.4GHz frequency as legacy B/G access for all other clients. If we wanted 300Mbps speeds on the 2.4GHz radio we would only have 1 non-overlapping channel to work with (when using 40MHz channels).
Are my assumptions correct or does anyone else have a better design?