Philips 190S8 Electronic User's Manual page 107

The direction of data flow from the host or away from the host. A downstream port is the port on a
hub electrically farthest from the host that generates downstream data traffic from the hub.
Downstream ports receive upstream data traffic.
Upstream
The direction of data flow towards the host. An upstream port is the port on a device electrically
closest to the host that generates upstream data traffic from the hub. Upstream ports receive
downstream data traffic.
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V
Vertical refresh rate
Expressed in Hz, it is the number of frames (complete pictures) written to the screen every second.
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