I understand from reading "take control books" k- and I am currently struggling 
with setting up a similar network to yours, Scott, that iPad has not the 
capacity to connect to 5ghz radio as it is still 8211G rather than N. With 
Express, it has as you point out a dual capacity  and it should switch 
autimatically unless you do not allow it in the configurations. I too find the 
configuring troublesome as I can't seem to access certain options when 
extending the network.

I will see what else I can find.

Simon
On 25 Apr 2011, at 01:57, Scott Howell wrote:

> All,
> 
> I hope this will make sense, but this is a little complicated perhaps. 
> Currently I have an AirPort Time Capsule as the main router and an AirPort 
> Express on another floor to extend the range of the network. The Time Capsule 
> has both a 2.4Ghz and 5Ghz radio. I learned the AIrPort Express does as well. 
> I have effectively two networks it seems in that devices can connect to the 
> 2.4Ghz or 5Ghz network, which has the same name accept the 5Ghz network 
> actually states network name followed by 5Ghz. The goal of course was to 
> segregate the 8211G devices from the 8211N devices by allowing devices 
> supporting 8211N to only access the 5Ghz network. THis seems to work fine, 
> but I noticed that my iPad was loosing it's connection until I allowed it to 
> connect to the AirPort Express by entering the password (which is the same 
> for the entire network). My thought was that perhaps for some reason although 
> the Express is extending the network, the iPad was not making the switch to 
> the extender. So, that got me to wondering if the iPad was connecting to the 
> 2.4Ghz or 5Ghz portion/radio of the network. I'm still not entirely sure 
> since it seems the AirPort Express when setup does not allow access to a lot 
> of the configuration options. Well ok, of course you can change anything, but 
> when configured to extend the range of the network, it would make sense that 
> you would not need access to all options (if that made sense).
> So, once I connected it seem to behave as expected, but at that time I did 
> not realize the AirPort Express had both 2.4 and 5Ghz radios. So, after all 
> that prattle, does anyone know a bit on how these routers work as far as 
> handing off traffic to an extender and how a device knows to make the switch? 
> I suspect I know more than I realize, but just haven't found the best 
> resource to learn. 
> 
> Thanks,
> 
> Scott
> 
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