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CC1352P: What is the largest number of devices that we can add to the network?

albgarc2014
Genius 3520 points
Part Number: CC1352P
Other Parts Discussed in Thread: CC2538, CC2530, CC2652P, Z-STACK, SYSCONFIG

Hi TI,

We need a zigbee network with a large number of devices. We have these doubts:

1-) What is the largest real (not theoretical) number of devices (end devices and routers) that we can add to the coordinator (CC1352-ZNP)?

2-) What is the largest real (not theoretical) number of devices (end devices and routers) that we can add to a repeater?

3-) To achieve the highest transmission power and reception sensitivity, which of these modules would be the best option: CC2530, CC231, CC2538, CC2352, CC2652? If you have other alternative, please can you suggest us.

Thanks,
Best Regards.

  • +1
    TI__Guru**** 218827 points

    Hi albgarc,

    The largest network tested internally has been ~200 nodes.  A large network consisting of ~80 nodes is tested each quarter to validate Z-Stack network stability.  SysConfig settings have been generated to verify that ~500 nodes is feasible, and the boundary can be pushed beyond that with further optimization, however this will likely cause network instability due to the increased number of devices communicating over a single network.  The ZNP and repeaters will also not be hindered by applications which take more flash/RAM to achieve their tasks.  You should be using the SimpleLink CC2652P for the best Zigbee solution from TI.

    Regards,
    Ryan

  • 0 in reply to Ryan Brown1
    Genius 3520 points

    Hi Ryan,

    Thank you very much!

    So assuming 200 nodes connected to the network (znp coordinator) is a good approximation, right?

    When you refer to node do you mean end device, router or both?

    If a router in the network has 10 devices connected to it, is the router counted as a single node or as 10 nodes?

    Again, than kou very much. 

    Best Regards

  • +1 in reply to albgarc2014
    TI__Guru**** 218827 points

    I should emphasize that a robust mesh network is optimal.  200 nodes (each individual router and end device) directly associated to the coordinator could create too many direct simultaneous packets for the concentrator to handle.  Multiple hops (where end devices are associated to routers which can then pass the message to the coordinator or next router) help manage message queues.  Up to five hops have been shown to be reliable (see SWRA650).  Certainly more than 200 nodes can be allowed if a suitable mesh network has been established.

    Regards,
    Ryan

  • 0 in reply to Ryan Brown1
    Genius 3520 points

    Hi Ryan!

    Sincerely, Thank you very much for the clarifications. Please, I have son question yet. 

    As I understood it is important to create a network with a topology like the one shown in the application report you provided.

    1-) Am I right?

    2-) Is there any rule to determine how many routers are needed?

    For example: in the application report there are 12 routers (16%) and 62 end devices (84%).
    3-) Could I follow this % rule to estimate the amount of routers in a larger network (I would distribute the end devices equally)?

    In the application report, each router is configured to have a maximum of 6 end devices.
    4-) What is the maximum number of end devices that a router can have?

    Could I also create a topology like the one shown in the attached image? Or is a horizontal network as shown in the application report always a better idea?

    Again, thank you very much. Best Regards.

  • +1 in reply to albgarc2014
    TI__Guru**** 218827 points

    The Application Report suggests a viable network topology but certainly not a requirement.  There can be more or less nodes (ZRs/ZEDs) per zone, and more than six ZED children per ZR can definitely be considered.  The critical point is to create a robust mesh network which does not overly stress any given routing device.  The solution you've devised appears feasible.

    Regards,
    Ryan

  • 0 in reply to Ryan Brown1
    Genius 3520 points

    Hi Ryan!

    Sincerely Thank you very much. 

    Best regards!