wireless light switches, electrical meters with in-home-displays,
traffic management systems, and other consumer and industrial
equipment that requires short-range wireless transfer of data at
relatively low rates. The technology defined by the ZigBee
specification is intended to be simpler and less expensive than
other wireless personal area networks (WPANs), such as Bluetooth
or Wi-Fi.
ZigBee networks are secured by 128 bit symmetric encryption keys.
In home automation applications, transmission distances range
from 10 to 100 meters line-of-sight, depending on power output
and environmental characteristics.
Fig 2.21 ZigBee
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