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        Zigbee 版本比较-------------------------------Ben Q(本人E文名缩写，别误会)

Comparison chart

		2004	2006	2007	PRO
Interference avoidance
	Network coordinator selects best available RF channel/Network ID at startup time.
	Support for ongoing interference detection under operational conditions and wholesale adoption of a new operating RF channel and/or Network ID.
Automated/distributed address management
	Device addresses automatically assigned using a hierarchical, distributed scheme.
	Device addresses automatically assigned using a stochastic scheme.
Group addressing
	Devices can be assigned to groups, and whole groups can be addressed with a single frame; thereby reducing network traffic for packets destined for groups.
Centralized data collection
	Low-overhead data collection by ZigBee Coordinator explicitly supported.
	Low-overhead data collection by other devices supported under special circumstances (e.g. with Tree Routing).
	Many-to-one routing allows the whole network to discover the aggregator in one pass.
	Source routing allows the aggregator to respond to all senders in an economical manner.
Security
	128-bit AES encryption with 32-bit Message Integrity Code (MIC) and frame counters to assure message freshness.
	Security applied at the NWK layer by default, with key rotation to prevent hacking of the NWK key.
	Higher-layer security supported.
	Trust Center application, operating on the ZigBee Coordinator, manages trust on behalf of network devices and acts as the central authority on what devices can join the network.
	Trust Center can run on any device in the network.
	"High Security" mode available, which is selectable by Trust Center policy, and requires Application Layer Link keys; peer-entity authentication; and peer-to-peer key establishment using Master Keys.
Network scalability
	Network scales up to the limits of the addressing algorithm. Typically, networks with tens to hundreds of devices are supported.
	An addressing algorithm that relaxes the limits on network size. Networks with hundreds to thousands of devices are supported.
Message size
	< 100 bytes. Exact size depends on services employed, such as security.
	Large messages, up to the buffer capacity of the sending and receiving devices, are supported using Fragmentation and Reassembly.
Standardized commissioning
	Standardized startup procedure and attributes support the use of commissioning tools in a multi-vendor environment.
Robust mesh networking
	Fault tolerant routing algorithms respond to changes in the network and in the RF environment.
	Every device keeps track of its "neighborhood"; thereby further improving reliability and robustness.
Cluster Library support
	The ZigBee Cluster Library, as an adjunct to the stack, standardizes application behavior across profiles and provides an invaluable resource for profile developers.