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How does a USB hub slow down devices?

April 26, 2017Devices Hub slow USB

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How does a USB hub slow down devices?

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A USB hub has to re-calculate the time left before the next sof (end of the uframe); the small extra delay added by the hardware hub could make the transaction not handled as fast as a device directly connected to the host. If several devices are connected on the USB hub and working in parallel (for example, a webcam + a USB flash drive + a mouse), then the USB bandwidth is shared among the devices usage.