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Philips LCD monitor 170S7FB 43 cm 17" SXGA User Manual

Page 95

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Glossary

The upstream port of a hub connects the hub towards the host. Each of the other downstream ports

of a hub allows connection to another hub or function. Hubs can detect, attach and detach at each

downstream port and enable the distribution of power to downstream devices. Each downstream

port can be individually enabled and configured at either full or low speed. The hub isolates low

speed ports from full speed 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.

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