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Z-Wave Reliability Application Note
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In the example shown in Figure 2 the network consists of multiple nodes making it possible to use different routes if the communication fails. The Controller has multiple “Start Nodes” （3 in the shown example）， which can all be used as the first node in the route. Starting through Start Node 1 it tries two different routes. If both routes fails it tries two additional routes via Start Node 2. If these also fail， again two additional routes are tried via Start Node 3. If all six routes fail （could be the receiving node is switched off） an error message will be generated by the protocol and is presented to the Application Layer.
The above mentioned protocol implementations describes how the Z-Wave protocol improves the reliability of a RF based network. In conjunction with the protocol a robust RF circuitry must be implemented in order to achieve the optimum performance of the Z-Wave network. The following sections describe a range of real life tests performed with the ZM1220 Z-Wave Module developed by Zensys A/S. These tests prove the reliability of the Z-Wave protocol in combination with the well-tested and proven ZM1220 Z-Wave Modules.
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