Philips 107S16 Podręcznik użytkownika - Strona 32

Przeglądaj online lub pobierz pdf Podręcznik użytkownika dla Monitor Philips 107S16. Philips 107S16 37 stron. 17-inch (16.0" vis) color monitor

Glossary

See rotation function.

Trapezoid distortion

See Geometrical distortion.

TTL signal

A TTL (Transistor-transistor-logic) signal is a digital signal level for controlling the screen colors. With TTL

driving, the red, green and blue signals can only be switched on or off or provided with an intensity signal. A

TTL-driven monitor can thus display a maximum of 64 colors. Video standards such as MDA, CGA and EGA

are based on TTL level.

USB or Universal Serial Bus

A smart plug for PC peripherals.

bandwidth) required by peripherals. USB makes necessary resources available without user intervention.

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!

Hub

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

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USB automatically determines resources (like driver software and bus