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refer to a collection of hardware components that perform a particular function, such as a Universal Serial Bus interface
device. At an even higher level, device may refer to the function performed by an entity attached to the Universal Serial
Bus; for example, a data/FAX modem device. Devices may be physical, electrical, addressable, and logical.
Downstream
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.