23-01-2013, 12:57 PM
ZIGBEE PROTOCOL
ZIGBEE PROTOCOL.pptx (Size: 813.88 KB / Downloads: 31)
WHAT IS ZIGBEE?
ZigBee is a low-cost, low-power, wireless mesh networking standard .
Based on the IEEE 802.15.4- standard .
Its a wireless network protocol designed for low data rate sensors and control networks.
The mesh networking provides high reliability and larger range.
Operate in 2.4 Ghz ISM band.
Nominal range is 10 to 100 meters.
WHY ZIGBEE?
Low cost
Low power connectivity
Low complexity.
Reduced resource requirements.
Standard set of specifications.
Longer battery life.
Low data rate and secure networking.
ORIGIN OF TERM ZIGBEE
ZigBee originates from the silent, but powerful method of communication used by honeybees .
By "dancing" in a zig-zag waggle dance, a bee can share information about location, distance, and direction of a newly discovered food source to its fellow hive members.
NETWORK CONFIGURATION
There are two main components
Coordinator node
End device
Coordinator is a special variant of a Full Function Device (FFD).
End device may be an FFD or a Reduced Function Device (RFD).
RFD is the smallest and simplest ZigBee protocol node.
Implements minimal set of protocol services.
ZigBee protocol router is optional.
MODES OF OPERATION
In beacon enabled n/w nodes are allowed to transmit in a predefined time slots.
In non beacon n/w, all nodes in a n/w are allowed to transmit at any time as long as the channel is available.
CSMA/CA access mechanism is uesd.
Coordinator periodically begins with a superframe called as beacon frame;
All nodes are synchronized to this n/w.
CONCLUSION
Low cost (device, installation, maintenance)
Low power consumption
Simply implemented
Low data rates-250kbps.
Wireless mesh n/w.