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Zigbee abstract

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  • 1. ZIGBEE-TECHNOLOGY ABSTRACTZigbee is a low power spin off of Wi-Fi. It is a specification for small, low power radiosbased on IEEE 802.15.4 – 2003 Wireless Personal Area Networks standard. Thespecification was accepted and ratified by the Zigbee alliance in December 2004.Zigbee Alliance is a group of more than 300 companies including industry majors likePhilips, Mitsubishi Electric, Epson, Atmel, Texas Instruments etc. which are committedtowards developing and promoting this standard. ZigBee devices are often usedin mesh network form to transmit data over longer distances, passing data throughintermediate devices to reach more distant ones. This allows ZigBee networks to beformed ad-hoc, with no centralized control or high-power transmitter/receiver able toreach all of the devices. Any ZigBee device can be tasked with running the network. The technology defined by the ZigBee specification is intended to be simpler and lessexpensive than other WPANs, such as Bluetooth. ZigBee chip vendors typically sellintegrated radios and microcontrollers with between 60 KB and 256 KB flash memory.ZigBee operates in the industrial, scientific and medical (ISM) radio bands; 868 MHz inEurope, 915 MHz in the USA and Australia, and 2.4 GHz in most jurisdictionsworldwide. Data transmission rates vary from 20 to 900 kilobits/second.