RRM is the term given to managing your wireless radios, and it includes not only channel selection and signal power, but also deals with managing interference from unknown sources. The two WLC devices that you will likely encounter most often are the Cisco series controller or the Cisco series controller. The Cisco series controller: This controller has eight network ports on it; two ports support POE to power APs, and the other ports can be assigned as management interfaces or assigned to support various VLAN and network connections that you may be using to isolate traffic for your SSIDs. Depending on the model of the Cisco series controller you look at, you can manage up to APs through up to eight network ports transceiver slots , which are used as distribution system ports. This series of controller is typically connected to a network switch, which would provide network services for your APs.
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