Hello,  
  Integrations with OneFabric and "NetSight" (its not installed on a NAC appliance) are typically something that involves a Sales engagement and Professional Services,  but should you want to integrate this on your own you can find the documentation  on the Extranet:  
 
https://extranet.extremenetworks.com/downloads/Pages/OneFabricConnect.aspx  
Go to the Partner Resources tab.
     
    Note that if your account doesn’t allow access to the Partner tab,  then you will need to contact GTAC and get a case started etc.
Regards,
Scott Keene
Extreme GTAC