As I have understand, Cisco go for a software upgrade, but regarding Cisco's document the "802.1n Wireless Technology Overview" there is no guarantee for that in this case. However Cisco are using a modular design of the AP and if the ratified 802.11...

Hi,i would be using directional antennas and plan the the channels to be repeated at every 3th carriage (if you are going to use b or g). I don't think a intertrain problem will occure since they are a hugh metal case and the signal will be effected ...