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Extron • RGB 118 & RGB 118 PLUS • User’s Manual
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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