Hub

Glossary

●USB eliminates "case angst" -- the fear of removing the computer case to install add-on peripherals. And USB also eliminates adjustment of complicated IRQ settings when installing new peripherals.

●USB does away with "port gridlock." Without USB, PCs are normally limited to one printer, two Com port devices (usually a mouse and modem), one Enhanced Parallel Port add-on (scanner or video camera, for example) and a joystick. More and more peripherals for multimedia computers arrive on the market every day. With USB, up to 127 devices can run simultaneously on a computer.

●USB permits "hot plug-in." There's no need to shut down, plug in, reboot and run set-up to install peripherals. And no need to go through the reverse process to unplug a device.

In short, USB transforms today's "Plug-and-Pray" into true Plug-and-Play!

A Universal Serial Bus device that provides additional connections to the Universal Serial Bus.

Hubs are a key element in the plug-and-play architecture of USB. The Figure shows a typical hub. Hubs serve to simplify USB connectivity from the user's perspective and provide robustness at low cost and complexity.

Hubs are wiring concentrators and enable the multiple attachment characteristics of USB. Attachment points are referred to as ports. Each hub converts a single attachment point into multiple attachment points. The architecture supports concatenation of multiple hubs.

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;

file:///D/EDFU/crt_17_6/edoc/english/GLOSSARY/GLOSSARY.HTM (19 of 22)2005-04-08 ¤W¤È 11:26:01

107H specifications

The Philips 107H is a notable product in the realm of consumer electronics, particularly recognized for its display technology and design. This monitor, part of Philips' extensive range, has carved out a niche for itself by blending functionality and user-friendly features that cater to both casual users and professionals alike.

One of the standout features of the Philips 107H is its 17-inch CRT display, which provides a resolution of 1280 x 1024 pixels. This resolution ensures sharp and vivid images, making it suitable for various applications, from graphic design to office tasks. The CRT technology, while now largely overshadowed by LCD and LED options, still offers advantages in color depth and contrast levels, enabling a rich viewing experience. The monitor excels in rendering accurate colors, which is crucial for professionals working in creative fields.

In terms of ergonomics, the Philips 107H is designed with the user in mind. It incorporates a tilt and swivel base, allowing for adjustments in viewing angles to match individual preferences and comfort. This flexibility can significantly reduce eye strain during long periods of use, promoting a healthier working environment.

The monitor also stands out with its anti-glare screen coating, which minimizes reflections from ambient light sources, ensuring a clearer view in various lighting conditions. This feature is particularly beneficial for users working in brightly lit offices or environments where window glare could be an issue.

Connectivity is another strong point of the Philips 107H. It typically includes multiple input options like VGA connectors, facilitating easy connections to a wide range of devices, including computers and other peripherals. This versatility ensures that users can maximize their productivity without the need for additional adapters or converters.

In terms of energy consumption, while the Philips 107H is not as energy-efficient as modern flat-panel monitors, it adheres to reasonable standards for its time. The build quality is robust, providing durability and longevity, which is often a consideration for buyers looking for a reliable monitor that can withstand daily use.

Overall, the Philips 107H combines essential features, effective display technology, and ergonomic design to deliver a monitor that caters to a diverse audience. While it may not incorporate the latest advancements in display technology, its capabilities still make it a solid choice for those seeking a dependable and functional display solution.