http://e2e.ti.com/blogs_/b/smartgrid/archive/2012/07/13/smart-energy-profile-2-0-demonstration-from-ti-featuring-our-latest-zigbee-soc-cc2538.aspxSmart Energy Profile (SEP) 2.0 is an application profile in development that will be used by energy management devices supporting internet protocol (IP). SEP 2.0 is MAC and PHY agnostic so that device manufacturers can implement any MAC/PHY under an IPen-US6.x Production