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I am considering purchasing a monitor which features USB 3.0 super-Speed Hub (with 1 x USB upstream port / 2 x USB3.0 and 2 x USB 2.0 downstream ports).

What does this mean?

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USB is asymmetric. From the hub's point of view, "upstream" is the connection to the PC (the USB host), while "downstream" refers to connections to the devices.

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