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Wireless Network Physical Architecture 71
Table 3.8 : ZigBee devices and features
ZigBee device
PC input devices
Automation devices
Wireless remote control
Sensor modem
Ethernet gateway
Key features
Wireless connectivity to a PC mouse or keyboard.
Wireless control devices for home and industrial automation functions
such as heating, lighting and security.
Replacing Ir remote for TV etc., and eliminating the line-of-sight and
alignment restriction.
Provides a wireless networking interface for a number of existing current
loop sensors for home or industrial automation.
A ZigBee network coordinator that enables command of ZigBee end
devices or routers from an Ethernet network.
Network
coordinator
Sensor
modem
Ethernet
gateway
3.4.2 Wireless PAN Antennas
Figure 3.21 : A variety of ZigBee devices
(courtesy of Cirronet Inc.)
In practice, since PAN operating range is generally under ten meters, 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.
3.5 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
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