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Issues with D435i over USB 2.0

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3 comments

  • MartyG

    Hi Andrew Edwards  Instead of using a USB 2 hub, you could try using a USB 2 cable instead of the official USB 3 one supplied with the camera and connecting the camera directly to your computer's USB port.  Because a USB 2 cable lacks extra wires that enable a device to operate at USB 3 speed, the camera should operate in USB 2 mode when attached to a USB 2 cable.

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  • Andrew Edwards

    Hi Marty, the issue we had with this setup seemed to be related to host's USB controller and power negotiation. The host would limit the available power to USB 2.0 spec (500mA) which caused issues with the camera. The addition of a "dumb" USB hub in the middle seemed to resolve that issue. 

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  • MartyG

    Thanks very much for the additional information.  

     

    USB hubs have their own dedicated USB controllers, which will likely be a different brand to the USB controller that the computer's manufacturer chose for their built-in ports.  And some USB controllers work better with RealSense cameras than others.

     

    If your enclosure was able to use a mains electricity powered (active) USB 3.1 hub then it would be more stable than an unpowered (passive) hub as it would draw power from the mains socket instead of the computer's USB port (which in turns draws from the computer's power supply unit).  The hub would also have its own USB controllers independent of the ones on the computer.

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