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Chapter 7: ZigBee > 7.2 ZigBee Architecture

7.2 ZigBee Architecture

7.2.1 ZigBee and 802.15.4

ZigBee sits on top of 802.15.4 physical (PHY) and medium-access control (MAC) layers, which provide the functionality of the OSI physical and link layers.

So far ZigBee uses only the 2003 version of 802.15.4. All existing ZigBee commercial devices use the 2.4 GHz S-Band as the 2003 version of 802.15.4 does not allow sufficient bandwidth on other frequencies. The 2006 version adds improved data-transfer rates for 868 MHz and 900 MHz but is not yet part of the ZigBee specification.

802.15.4 offers 16 channels on the 2.4 GHz, numbered 11 to 26. ZigBee uses only the nonbeacon-enabled mode of 802.15.4, therefore all nodes use CSMA/CA to access the network, and there is no option to reserve bandwidth or to access the network deterministically. ZigBee restricts PAN IDs to the 0x0000 – 0x3FFF range, a subset of the 802.15.4 PAN ID range (0x0000-0xFFFE).


  

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