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Hi Roger, USB hubs stacked together add to the latency of the complete system. USB requires certain timing to be recognised and when adding multiple components to add to that time until it become un-reliable. The powered cables are designed to transmit at the speed required, the powering are active transmission equipment to boost the signal levels and maintain that speed over longer leads.
I am going to experiment with Bluetooth module to see if they can be modified to work USB 2.0 directly instead of just comms.
Most work using comms conversion which is not able to send Video or images.
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