FRA will look at the calculated -67 dBm boundary between all 2.4 GHz interfaces.  It evaluates cell overlap to identify redundant interfaces ( not needed).  FRA uses neighbor RSSI to evaluate the cell size.  In normal carpeted office space with normal ceiling height (8-10 feet) this works pretty well at reducing the number of 2.4 GHz interfaces and eliminating the over saturation of 2.4GHz that normally exists.  In high ceiling or lower density deployments ( large public venue, warehousing - ceilings 25 feet or over) the neighbors will be heard at the ceiling between one another and not hear the return RSSI from the floor as well.  That can produce un desirable results. If the interface is an XOR (2.4 and 5) it can be converted to a serve 5 GHz radio. FRA can also disable or place in monitor mode any band-locked 2.4 GHz radio to balance the coverage. ... View more