Hi: I have a Lennox wifi thermostat which is a 802.11b device. I was experimenting with lowering the transmission rate this morning to more closely match the Internet WAN rate. Apparently if you manually set the transmission rate higher than 11 the b client cannot connect. Unfortunately, despite the WAN being nominally 8 megabit, setting a rate of 11 is not enough for full speed. You need 12 to 18 minimum for a 8 megabit Internet connection. I am not sure why, but this appears to be the case. It would have been fine at 11 back when 5M Internet connections were common. But not now, with packages being offered going up to 25M. As a result, it must be left on Auto. Since there is a 802.11b client present I also have CTS on as well.