The Cisco 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 controller?a centralized Mode for campus environments, Cisco 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 Cisco Unified wireless network, the 3504 controller provides real-time communications between Cisco Aironet Access Points, Cisco Prime Infrastructure, and the Cisco Mobility Services Engine, and is interoperable with the Cisco 5520 and 8540 wireless controllers.