Amendment Standard - Superseded. This amendment defines and alternative physical layer (PHY) for IEEE Std 802.15.3-2003. Three PHY modes have been defined that enable data rates in excess of 5 Gb/s using the 60 GHz band. A beam forming protocol has been defined to improve the range of communicating devices. Aggregation and block acknowledgment have been defined to improve the medium access control (MAC) efficiency at the high data rates provided for by the PHY.