f the multi-band OFDM radio to spatially locate a wireless USB station, offering the potential for devices that rely on location based services. ZigBee Devices ZigBee is an emerging low data rate, very low power, wireless networking technology, described in the Section "ZigBee (IEEE 802.15.4), p. 273", that will initially focus on home automation but is likely to find a wide Chapter Three range of applications, including a low cost replacement for Bluetooth in applications that do not require higher data rates. The key features of a range of currently available and expected ZigBee devices is summarised in Table 3-8, and some of these devices are shown in Figure 3-21. Wireless PAN antennas In practice, since PAN operating range is generally under ten metres, Bluetooth and other PAN devices will typically use simple integrated omnidirectional antennas. However, for PANs such as Bluetooth that share the 2.4 GHz ISM radio band with 802.11b/g WLANs, the wide range of external WLAN antennas described above are also available to enable PAN devices to be operated with extended range. Table 3-8: ZigBee Devices and Features ZigBee device Key features PC input devices Wireless connectivity to a PC mouse or keyboard. Automation devices Wireless control devices for home and industrial automation functions such as heating, lighting and security. Wireless remote control Replacing Ir remote for TV etc., and eliminating the line-of-sight and alignment restriction. Sensor modem Provides a wireless networking interface for a number of existing current loop sensors for home or industrial automation. Ethernet gateway A ZigBee network coordinator that enables command of ZigBee end devices or routers from an Ethernet network. Wireless MAN Devices While wireless LANs and PANs present a wide diversity of topologies and device types, to date wireless MAN devices have serviced only fixed point-to-point and point to multi-point topologies, requiring in essence only two device types, the base station and the client station. However, followin