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TCO
See Electromagnetic radiation standards.
Tilt function
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.
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U
USB or Universal Serial Bus
A smart plug for PC peripherals. USB automatically determines resources (like driver software
and bus bandwidth) required by peripherals. USB makes necessary resources available without
user intervention.
z 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.
z 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.
z 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