The protocol and compatible interconnection for data communication devices using low-data-rate, low-power, and low-complexity short-range radio frequency (RF) transmissions in a wireless personal area network (WPAN) are defined in this standard. A variety of physical layers (PHYs) have been defined that cover a wide variety of frequency bands. (The PDF of the standard is available at no cost at http://standards.ieee.org/about/get/802/802.15.html compliments of the GETIEEE standards program)