PHY

Radio physical layer (PHY) provides functions for radio transceiver access.

Some of them are accessible only by the network layer (request to send data, data indication); some of them can be used from the application (channel selection, random number generation, energy detection, etc.)

Modules
	AT86RF212B PHY Layer
	The AT86RF212 is a low-power ,low voltage 700/800/900 MHz radio transceiver designed for industrial and consumer ZigBee/IEEE 802.15.4, 6LoWPAN, RF4CE and high data rate sub 1GHz ISM band applications.