January 2018
Intermediate to advanced
524 pages
13h 33m
English
Content preview from Internet of Things for Architects
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Zigbee PHY and MAC (and difference from IEEE 802.15.4)
Zigbee, like Bluetooth, operates primarily in the 2.4 GHz ISM band. Unlike Bluetooth, it also operates at 868 MHz in Europe and 915 MHz in the USA and Australia. Because of the lower frequency, it has better propensity to penetrate walls and obstacles over traditional 2.4 GHz signals. Zigbee does not use all of the IEEE802.15.4 PHY and MAC specifications. Zigbee does make use of the CSMA/CA collision avoidance scheme. It also uses the MAC level mechanism to prevent nodes from talking over each other.
Zigbee does not use the IEEE802.15.4 beaconing modes. Additionally, the guaranteed time slots (GTS) of SuperFrames are also not used in Zigbee.
The security specification of 802.15.4 is ...
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