Philips 200WB7EB-27 User Manual download pdf (Page 102)

Glossary

Device

A logical or physical entity that performs a function. The actual entity described depends on the

context of the reference. At the lowest level, device may refer to a single hardware component, as

in a memory device. At a higher level, it may 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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Philips 200WB7EB-27 User Manual Page 102