Philips 150S4FG - Manual (Page 21)

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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Glossary
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