ZIGBEE -IEEE 802.15.4- NETWORK CHARACTERISTICS
ZigBee networks consist of three types of nodes:
ZigBee coordinator(ZC): The most capable device, the coordinator forms the root of the network tree and might bridge to other networks. There is exactly one ZigBee coordinator in each network since it is the device that started the network originally. It is able to store information about the network, including acting as the Trust Centre & repository for security keys.
ZigBee Router (ZR): As well as running an application function a router can act as an intermediate router, passing data from other devices.
ZigBee End Device (ZED): Contains just enough functionality to talk to the parent node (either the coordinator or a router); it cannot relay data from other devices. This relationship allows the node to be asleep a significant amount of the time thereby giving long battery life. A ZED requires the least amount of memory, and therefore can be less expensive to manufacture than a ZR or ZC.
ZigBee can be used in a variety of network topologies; Star, Tree and Mesh with up to 65,536 network (client) nodes.
The Diagram below shows different topologies supported in ZigBee (double click on figures for more information);
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