Appendix A. ZigBee 2007 and ZigBee Pro
This appendix covers the features added to the new ZigBee 2007 specification.

A.1. ZigBee 2006, 2007, and ZigBee Pro

ZigBee is really three, three, yes three stacks in one: ZigBee 2006, ZigBee 2007 (often called just ZigBee) and ZigBee Pro. Originally, there was also ZigBee 2004, but that stack is considered deprecated, and is no longer in use (except in legacy systems).
The three ZigBee stacks have more similarities than they do differences, and indeed they can join networks that were started with the other stacks. Some stack vendors offer only one, while others offer all three stacks with a choice at compile and/or run-time. When evaluating a stack or a stack vendor, be sure you know which stack configuration ...

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