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Extron • RGB 118 & RGB 118 PLUS • User’s Manual
Glossary
Peaking - Peaking compensates for mid and high frequency RGB
Video Bandwidth response in data monitors and projectors and for
signal losses due to cable capacitance. When using the Peak
enhancements on the RGB 118 and RGB 118 PLUS interface,
please use the following guidelines for proper output settings:
__ Use with all computer frequencies between 15-125 kHz at any
cable length.
__
Use with high frequency computers of 36 kHz or higher with cable
lengths 75 feet or greater.
Serration - A vertical synchronizing pulse divided into a number of
small pulses, each acting for the duration of half a line in a
television system. Serrations are used to keep the horizontal
oscillator synchronized during the vertical sync pulse interval.
Sync - The synchronization signals or timing pulses which lock the
electron beam in step, both horizontally and vertically, with the
image signal. Also called Composite Sync, this signal is derived
from a composite or combination of horizontal and vertical drives,
with some slightly narrowed and delayed pulses, as well as, the
addition of equalizing pulses. It is one of the more popular signals
used in video systems today and when used is usually
accompanied by subcarrier.
TERMINATOR - A resistor at the end of a coaxial cable or line used
to match the impedance of the equipment being used. The
resistor absorbs signal energy to prohibit signal reflections back to
the source. This causes the source equipment to operate as if the
line is connected to equipment of equal impedance.
TTL - Transitor to Transitor Logic. Digital type signal, usually 4-5
volts peak to peak. Distance limitation is 6-10 feet. Signal
splitting is acceptable. TTL signals are either “ON” or “OFF” and
is characteristic of low resolution computers (CGA).
VGA - Video Graphics Array. Introduced by IBM in 1987, VGA is an
Analog signal with TTL level separate horizontal and vertical sync.
The video outputs to a high density 15 pin 3 row “D” type
connector and has a horizontal scan frequency of 31.5 kHz and
vertical frequency of 70 Hz (Mode 1, 2) and 60 Hz (Mode 3). The
signal is non-interlaced in modes 1, 2, 3 and interlaced when
using the 8514/A card (35.5 kHz, 86 Hz) in mode 4. It has a Pixel
x Line resolution of 640 x 480 with a color palette of 16/256,000.
_ For a more complete understanding of Computer Interfacing ask
about Extron’s “Introduction to Computer Interfacing” videocassette.
A training tool designed to provide the experienced or novice sales
person with the most concise information on Computer Interfacing.
Tape length 55 minutes.
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