Fortinet WCL50D WiFi Controller

Not sure if this is what you are looking for :) https://technet.microsoft.com/en-us/library/dd197535(v=ws.10).aspx

and

https://social.technet.microsoft.com/Forums/windowsserver/en-US/0ad5eed4-baf8-4fcf-96da-17a6fbcf07bd/nps-mac-authentication?forum=winserversecurity

so this is "on top" of a standard radius server setup using 802.1x

For the FWLC50D it will be the radius client in NPS

/Brian