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Maximum number of HOPS in an Zigbee Pro Network?

Franz Gustav Niederheitmann
Intellectual 895 points
Other Parts Discussed in Thread: Z-STACK

Hello,

i want to know what are the maximum values to the ZIgbee-Pro Stack? (i.e. MAX_CHILDREN, MAX_ROUTERS, MAX_DEPTH, "MAX_HOPS")

we are going to use an network with thousand of routers (inline) and few end devices conected to these routers , and we want to send messages i.e. from one end-device in one side of a city to another end-device in the other side of the city.

It seem that there is an limitation of 255 hops in the network. Is it true? what happened when we reach the 255 hop?

Thanks

  • 0
    Prodigy 135 points

    Hello

     

    I want know why the number maximum of hops is equal ( 2* NWK MaximumDepth) .

     

     

    Thanks

    JVELL

  • 0 in reply to JVELL
    Intellectual 300 points

    Hi JVELL,

    Network MaximumDepth is the number of hops from the coordinator to the farthest  node. The maximum number of hops is from an edge of the network to the opposite edge. It takes MaximumDepth of hops to reach the coordinator (center of the network) and another MaximumDepth of hops to reach the opposite end. Thus 2* NWK MaximumDepth.

     

    Franz:

    It would seem the maximum number of hops is 255. The radius in broadcast messages is a 8-bit number, so it's the limiting factor. If the network depth is more than that, then broadcasts won't possibly reach all devices. I don't see any other problems, but if broadcasts fail, then probably routing fails etc.

    I remember reading from some source, that if the radius is set to 0x00 then the broadcast has unlimited range, but if I remember right, Z-stack uses default radius in that case.

     

    Hope that helps,

    Lasse