This allows the access points to mitigate wireless interference in heavy wireless use zones. For example if your office is located in an area where there are a lot of other wireless signals, the 3500 will allow you to have a more stable wireless network.

You don’t need to deploy all 3500 series access points either. You can deploy a few in a few choice locations and then use normal 1140 series access points for the rest.

You can read more about the Cisco 3500 series access points here.

-RP