Philips 107S16 Benutzerhandbuch - Seite 33

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Glossary

signaling.

A hub consists of two portions: the Hub Controller and Hub Repeater. The repeater is a protocol-controlled

switch between the upstream port and downstream ports. It also has hardware support for reset and

suspend/resume signaling. The controller provides the interface registers to allow communication to/from the

host. Hub specific status and control commands permit the host to configure a hub and to monitor and control

its ports.

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.

UPS (Universal Power Supply)

The monitor with UPS feature can work in different countries with various mains voltage.

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