AIR-CT3504-K9 is the 3504 Wireless Controller. The 3504 Wireless Controller provides centralized control, management, and troubleshooting for small to medium-sized enterprises and branch offices. It offers flexibility to support multiple deployment modes in the same controllera centralized mode for campus environments, FlexConnect® mode for lean branches managed over the WAN, and a mesh (bridge) mode for deployments in which full Ethernet cabling is unavailable. As a component of the Unified Wireless Network, the 3504 controller provides real-time communications between Aironet® access points, Prime® Infrastructure, and the Mobility Services Engine, and is interoperable with the 5520 and 8540 Wireless Controll