I currently have 2 buildings that are connected using wireless bridging between a AIR-AP1310 and a Cisco1800 with an HWIC-AP module. I would like to bring a 3 building into the picture which has line of site to the AP1310. I would like to use the SA520, so I get the firewall and VPN features. Can the SA520 be set up in Bridge mode to connect to a AP1310? If not can any of the small business AP units connect in this fashion? I know I can use a AP1240 Series unit.