= Medium Access Control = With the flexibility afforded by the OFDM physical layer, MAC layers with varying degrees of control can be implemented. In order to abstract the functionality of the physical layer, the [wiki:WARPMAC WARPMAC] and WARPPHY frameworks provide hooks that the MAC designer can use. The frameworks are updated at the same time as the physical layer to expose any new features that are available to the MAC layer. Two MAC layers are included in the OFDM Reference Design by default. * [wiki:CSMAMAC CSMA MAC] * [wiki:NOMAC NO MAC]