Extron electronic RGB 118 PLUS user manual Glossary

Glossary

Glossary

Bandwidth - For video amplifiers, bandwidth is a measure of the range of frequencies that make up the components of video character information within which a video amplifier will respond. The frequency range (passband) is usually measured between the half-power (3-dB) points on the video amplifier amplitude output response vs. frequency curve for a wide range of frequencies while maintaining a constant input signal amplitude for each frequency.

CGA - Color Graphics Adapter. Inroduced in 1983, it was IBM's first product to display both color and graphics. An RCA jack above the 9 pin video output connector provides NTSC video. Signal type is TTL, non-interlaced, with Pixel x Line resolution of 640 x 200 and a color palette of 4/16. CGA has a horizontal scan frequency of 15.75 kHz and vertical frequency of 60 Hz.

Data Monitor - A monitor with horizontal scan capability between 15.75-36(42) kHz. Data monitors and projectors are commonly associated with NTSC video, IBM CGA through VGA and Apple/ Macintosh computer input sources.

ECL - Emitter Coupled Logic. ECL signals are high speed digital logic and are mostly found in high resolution CAD/CAM computers and are usually monochrome or black and white. ECL operates in two level states and switches between these states in small increments of time. Bits are: Next/Most/Least Significant. Conversion to analog is required for proper interfacing.

EGA - Enhanced Graphics Adapter. Introduced by IBM in 1984, the EGA card may be configured with dip switch settings to provide an MDA or CGA output signal. Signal type is TTL, non-interlaced with a Pixel x Line resolution of 640 x 350 and a color palette of 16/64. EGA horizontal scan frequency is 21.8 kHz or 15.75 kHz in CGA mode. Vertical frequency is 60 Hz. The EGA card outputs to a 9 pin “D” type connector.

Graphics Monitor - A monitor with horizontal scan capability from 15.75-75 (80) kHz. Graphic monitors and projectors accept input from NTSC Video and CGA- VGA, as well as, high resolution computers and CAD/CAM workstations.

ICWK “Internal Computer Wiring Kit” - ICWK kits provide interfacing signals for computers and terminals with no external video display output. Internal video monitor signals are routed externally from the terminal, usually to a 9 pin connector. From the 9 pin connector, a short cable is included with the kit for signal transfer to the interface 9 pin connector input.

MBC “Monitor Break-out Cable” - A cable used to view a local monitor or terminal while simultaneously routing the computer signal to a new source, such as a data projector or monitor. The cable contains a male and female video connector, either piggy- backed to each other or provided as a Y type cable.

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