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CC3235S: CC3235S meets speed lower when there are 4 units

Herbert Wang
Intellectual 675 points
Part Number: CC3235S


We encountered a rate problem when using cc3235s, the phenomenon is as follows:
Multiple cc3235s are connected to a router in the shielded room, and the cc3235s sends 3mbps video stream to the pc.
When the number of 4 units, the speed of each unit can be stable at about 3mbps, and when more than 4 units, there will be one or two rates less than 1mbps.
Tried 2.4G and 5G different channels, different routers, the phenomenon is the same. Compared with olow-power wifi 4 of other supplier , there is no such problem.
Therefore, I think it is the problem of cc3235s, please help to analyze it, thank you.

  • 0
    TI__Guru 63006 points

    With multiple devices transmitting simultaneously on the same channel you should expect collisions that will reduce the throughput.

    The situation can be worsen if the distance between the devices is large (e.g. if both can hear the AP but can't hear one each other directly but especially if their access to the AP is not perfect, i.e. having a lot of FCS errors and thus retransmission) - i guess this is not the case within the shielded room but just in case.

    For comparing to other devices you'll need to compare the RF parameters (especially the Rate supported: cc3235 support up to 54Mbps - higher rates will allow more devices to share the channel). 

    If you can capture a sniffer log we might be able to help in analyzing the exact bottleneck.