Extron electronic Extron Electronics Computer Hardware RGB 118 User Manual

User's Manual  
RGB 118 & RGB 118 Plus  
Computer-Video Interfaces  
Legend of Icons  
The following icons may be used in this manual:  
___ Important information – for example, an action or a step that must  
be done before proceeding.  
___ A Warning – possible damage could occur.  
_ A Note, a Hint, or a Tip that may be helpful.  
__ Possible Electrostatic Discharge (ESD) damage could result from  
touching electronic components.  
__ Additional information may be referenced in another section, or in  
another document.  
Extron’s RGB 118 & RGB 118 PLUS  
User’s Manual  
Chapter One  
Introduction to the  
RGB 118 & RGB 118 PLUS  
COMPUTER-VIDEO INTERFACES  
Introduction  
Features  
Specifications  
1
Introduction to the RGB 118 & RGB 118 PLUS  
Introduction  
About This Manual  
This manual contains connection, operation and application  
information for the RGB 118 and RGB 118 PLUS universal  
interfaces.  
RGB 118 & RGB 118 PLUS Facts and Features  
The Extron RGB 118 and RGB 118 PLUS are Universal  
Computer-Video Interfaces compatible with computer monitor  
video signals such as CGA, EGA, VGA, MCGA, IBM PS/2, MAC II,  
Super VGA and more. Providing an RGB bandwidth range of 150  
MHz (rise and fall time of 4 nS) and a horizontal frequency range  
of 15-100 kHz, the RGB 118 and RGB 118 PLUS allow any  
compatible computer to be connected via simple MBC or ICWK  
input cable change.  
Features  
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
*
*
Universal compatibility  
120 MHz RGB video bandwidth (-3db)  
LED power indicator  
Horizontal centering with ON/OFF switch  
Three position peaking/sharpness and gain control switch settings  
Variable gain controls (R,G,B)  
Serration pulse removal switch  
Sync on green switch for output  
Automatic sync stripping from RGB  
Blue enhancement (TTL only)  
MBC power output jack  
External control knobs  
Metal enclosure  
MBC interface cable required  
Simple installation and operation  
LCD scan-rate display of horizontal and vertical frequencies  
SRI – holding the RGB 118 PLUS up to the face of a computer’s  
monitor will display the horizontal and vertical scan-rates on the  
LCD readout without any attached input cables.  
*
Vertical centering with ON/OFF switch  
* The bottom three features apply only to the RGB 118 PLUS  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Page 1-1  
Introduction to the RGB 118 & RGB 118 PLUS  
Specifications  
RGB 118 and RGB 118 PLUS  
Dimensions .. 4.63” W x 4.75” D x 1.75” H  
.. 11.7cm W x 12cm D x 4.4cm H  
Shipping Weight.. 4 lbs. (1.8 kg)  
Power Supply.. 12 volt 800 mA (wall mount)  
Warranty.. 2 years parts and labor  
.. (See Appendix)  
Input Signal  
Video .. Analog: .5 to 1.2 volts p-p  
.. ECL: .8 to 1.0 volts p-p  
Sync.. TTL: .3 to 5.0 volts p-p  
.. Separate Sync TTL (±)  
.. Composite Sync TTL (±)  
Frequency  
Compatibility.. 15 to 100 kHz horizontal  
.. 30 to 150 Hz vertical  
RGB Bandwidth.. 120 MHz (-3db)  
Video Amplifier Bandwidth  
(VAB).. 200 MHz  
Actual Bandwidth (AB).. 120 MHz (-3db)  
RGB 118 PLUS only  
LCD Scan-Rate Range.. 10 to 125 kHz horizontal  
.. 30 to 200 Hz vertical  
RGB 118  
RGB 118 PLUS  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Page 1-2  
Extron’s RGB 118 & RGB 118 PLUS  
User’s Manual  
Chapter Two  
Operation of RGB 118 & RGB 118 PLUS  
Front Panel  
Top Panel  
Internal DIP Switches  
Using the SRI  
2
Operation  
Operation of RGB 118 and RGB 118 PLUS  
Front Panel  
The following descriptions are keyed* to the RGB 118 PLUS  
drawings below and on the facing page.  
A
SRI Pushbutton Switch (RGB 118 PLUS ONLY)  
Push and hold this button in to enable the RGB 118 PLUS SCAN-  
RATE LCD to display the horizontal and/or the vertical scan rate  
frequency of a monitor (See Using the SRI on Page 2-5 for details).  
B
C
Vertical Center Control (RGB 118 PLUS ONLY)  
Turning this RGB 118 PLUS control shifts the displayed image up  
or down if the Vertical Center Switch is in the ON position.  
Vertical Center Enable Switch (RGB 118 PLUS ONLY)  
Enable/disable the RGB 118 PLUS Vertical Center Control – OFF  
position disables and ON position enables.  
D
E
MBC Power Connector  
Provides 12 VDC for Extron MBC Buffers.  
Universal 9 Pin Input Connector  
The RGB 118 and RGB 118 PLUS video input is supplied through  
this connector. Acceptable input types are TTL, Analog and ECL.  
Connector pin assignments follow:  
Pin # ANALOG  
DIGITAL (TTL or ECL)  
Ground  
Red Prime  
Red  
Green  
Blue  
Green Prime  
Blue Prime  
Horizontal Sync  
Vertical Sync  
1
2
3
4
5
6
7
8
9
Ground  
No Connection  
Red  
Green/Sync on Green  
Blue  
No Connection  
No Connection  
Horizontal/Composite Sync  
Vertical Sync  
F
Horizontal Center Enable Switch  
Enable/disable the Horizontal Center Control – Off position disables  
and ON position enables.  
G
Horizontal Center Control  
Turning this control shifts the displayed image to the left or right.  
* – Letters next to the descriptions are keyed to the circled letters in the  
drawings on this and the next page.  
Page 2-1  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Operation  
Top Panel  
Blue Enhance Control (Valid for TTL input only)  
H
This control allows adjusting a blue text display to an easier to read  
blue-green color.  
I
Scan Rate Indicator (SRI) LCD Panel (RGB 118 PLUS ONLY)  
The LCD panel displays a monitor’s horizontal or vertical scan rate  
frequency.  
J
V = Vertical Scan Rate (RGB 118 PLUS ONLY)  
Indicates vertical scan rate is currently being monitored.  
K
L
H = Horizontal Scan Rate (RGB 118 PLUS ONLY)  
Indicates Horizontal scan rate is currently being monitored.  
Peak Switches (All three switches must be set to same position.)  
· Normal – Input to output signal = unity gain (gain = 1)  
· Boost (Long Line Level Peaking) – Boost and Peak all frequencies  
· High Frequency Peaking – Decreases “fuzziness” or “streaking”  
associated with interfacing high frequency computers.  
M
Output BNC connectors (located on rear panel)  
1 = R = RED video output  
2 = G = GREEN video output  
3 = B = BLUE video output  
4 = S = Sync output  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Page 2-2  
Operation  
Internal DIP Switches  
Internal DIP switch settings determine the operating mode of the  
RGB 118 and RGB 118 PLUS. Changing the switch settings  
requires removal of the top and bottom halves of the case as  
described below.  
Opening the RGB 118 or RGB 118 PLUS Case  
To open the RGB 118 or RGB 118 PLUS case, remove the screw  
from the bottom of the case (see Figure 1 on facing page). This  
enables removal of the top and bottom halves of the case as  
shown in Figure 2.  
Changing a Switch Setting  
The switches on the DIP switch module used in the RGB 118 and  
the RGB 118 PLUS are the slide type (see drawing, Figure 3 on  
facing page). To change the position of the slide switch, a small  
screw-driver is used to push (slide) the switch to the desired  
position (enable or disable).  
Setting Internal DIP Switches  
Internal DIP switches SW3-1,2, SW4-1, 2, 3 and SW5-1,2 affect  
RGB 118 and RGB 118 PLUS operation as follows:  
SW3-1 SW3-2 Serration/LCD Switch  
F1OFF  
OFF  
OFF Normal – Serration pulses remain w/output sync  
ON  
Serration pulses are removed from output sync2  
SW4-1 SW4-2 SW4-3  
Analog Output Switch  
Normal  
F1 ON  
ON  
OFF OFF  
OFF ON  
Sync on Green3  
Sync on Mono4  
OFF  
ON  
ON  
SW5-1 SW5-2 TTL Mode Switch  
F1OFF  
ON  
OFF Normal  
OFF 64 Colors < 18 KHz  
X
ON  
16 Colors > 18 KHz  
Notes:  
1. F = Factory setting  
2. Required by some projectors  
3. When setting the RGB 118 for Sync on Green, you must also  
disconnect the BNC cable from the external “Sync” output of the  
RGB 118 and RGB 118 PLUS. Otherwise, sync is output on both  
green and the composite sync output which may cause  
abnormal levels of green to appear on the presentation display.  
4. Monochrome Composite – Use the Green output only.  
Page 2-3  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Operation  
Figure 1  
Figure 2  
Figure 3  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Page 2-4  
Operation  
Using the SRI (RGB 118 PLUS only)  
The SRI feature of the RGB 118 PLUS is used to determine the  
approximate horizontal and vertical scan frequencies of video and  
computer monitors. To use the SRI, hold the RGB 118 PLUS with  
the feet against the face of the monitor and near the center of the  
screen as shown in Figures 1 and 2 below.  
To view the vertical scan frequency, hold the unit so the LCD  
readout is on a vertical plane (red SRI button is in the uppermost  
position) as shown in Figure 1. Wait until the green Vertical (V)  
LED turns on, then push and hold the red SRI button in until a  
readout is obtained.  
To view the horizontal scan frequency, hold the RGB 118 PLUS so  
the LCD readout is on a horizontal plane (normal viewing) as  
shown in Figure 2. When the red Horizontal (H) LED turns on,  
push and hold the red SRI button in until a readout is obtained.  
Anti-static, anti-glare or EMI coatings on the face of the CRT may  
prevent the RGB 118 PLUS SRI from displaying the monitor’s  
scan frequencies properly. Should this occur, an alternate method  
to obtain a readout is to set the RGB 118 PLUS on top and toward  
the rear of the monitor as shown in Figures 3 and 4 below. To  
view the vertical scan frequency using this method, set the RGB  
118 PLUS as shown in Figure 3 with the red SRI button toward the  
rear of the monitor. Press and hold the red SRI button in when the  
green Vertical (V) LED turns on. To view the horizontal scan  
frequency, set the RGB 118 PLUS on the monitor as shown in  
Figure 4. When the red Horizontal (H) led turns on, press and hold  
the red SRI button until a readout is obtained.  
Checking monitor Horizontal Scan Rate using the RGB 118 PLUS SRI  
Checking monitor Vertical Scan Rate using the RGB 118 PLUS SRI  
Red  
SRI  
Button  
Figure 1  
Figure 2  
Red  
SRI  
Button  
Figure 3  
Figure 4  
Page 2-5  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Extron’s RGB 118 & RGB 118 PLUS  
User’s Manual  
Chapter Three  
RGB 118 & RGB 118 PLUS  
Applications  
3
Applications  
Applications  
Following are possible applications for the RGB 118 and/or the  
RGB 118 PLUS.  
1. As a Sync Stripper  
Using an MBC RGBS cable1, the RGB 118 can be used to strip  
Sync from Green and separate to Green and Composite Sync  
outputs.  
• Connect the RGB with sync on green signal to MBC RGBS cable.  
• Insert the MBC RGBS cable into the 9 pin input of the RGB 118.  
• Use the video and sync outputs of the interface as normal.  
2. Add Sync on Green  
The RGB 118 can be used to add either composite or separate  
Horizontal and Vertical (HV) sync to the green video channel. Use  
the MBC RGBS cable1 to add composite sync or the MBC RGBHV  
cable2 to add separate H&V sync.  
• Connect the RGBS signal to the MBC RGBS cable or the RGBHV  
signal to the MBC RGBHV cable.  
• Insert either of the MBC cables into the 9 pin Universal input of the  
RGB 118.  
• Use the instructions found on page 2-3 to add sync on green.  
• Use only the RGB outputs of the interface.  
3. As a Sync Combiner  
Using the MBC RGBHV cable2 the RGB 118 can be used to  
combine separate horizontal and vertical sync to composite sync.  
• Connect the RGBHV signal to the MBC RGBHV cable.  
• Insert the MBC RGBHV cable into the 9 pin Universal input of the  
RGB 118.  
• Use the Sync output of the interface as a composite sync.  
4. Mono Composite  
The RGB 118 can be used to convert any video signal to  
monochrome composite while maintaining resolution.  
• Connect any video signal to the MBC RGBS cable1.  
• Insert the 9 pin of the MBC RGBS cable into the Universal 9 pin  
input of the RGB 118.  
• Use the instructions found on page 2-3 to convert the signal to  
monochrome composite.  
5. Frequency Indicator  
The RGB 118 can be used as a Horizontal or Vertical frequency  
indicator of any monitor.  
Simply hold the RGB 118 PLUS up to the face of the monitor glass  
and hold in the SRI button on the front panel of the interface. The  
Horizontal and Vertical scan frequencies will automatically be  
displayed on the LCD. Refer to page 2-5.  
NOTES: 1. MBC RGBS cable: 4 BNC to 9 pin, Part #26-213-01  
2. MBC RGBHV cable: 5 BNC to 9 pin, Part #26-270-01  
Page 3-1  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Applications  
Application Diagrams  
The application diagram below (Figure 1) demonstrates an RGB  
118 Interface used to interface a PC Computer monitor to a large  
screen data monitor which could be located in the same room or in  
a different location up to 150’ away.  
RGB 118  
MBC VGA/XGA HR  
Large Screen  
Data Monitor  
Figure 1  
The application diagram below (Figure 2) demonstrates an RGB  
118 PLUS combined with an MBC SPARC Buffer to interface a  
high resolution computer/monitor workstation to a large screen  
projector. The MBC SPARC Buffer is used to allow the higher  
resolution signals to be transmitted with minimum signal loss and  
no reflections or signal ghosting. The MBC SPARC Buffer gets its  
power from the RGB 118 PLUS through the MBC Power jack.  
RGB 118 PLUS  
MBC  
SPARC  
BUFFER  
NeXT Color Computer,  
Sun SparcStation,  
SGI WorkStation  
Large  
Screen  
Projector  
Figure 2  
Page 3-2  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Applications  
The application diagram below (Figure 1) demonstrates an RGB  
118 PLUS combined with a Hi Res ECL Buffer and an MBC SUN/  
APOLLO MONO cable to interface a high resolution computer/  
monitor workstation to a large screen projector.  
RGB 118 PLUS  
Large  
Screen  
Projector  
Hi Res  
ECL Buffer  
MBC  
SUN/APOLLO MONO  
Cable  
SUN/APOLLO MONO  
Workstation  
Figure 1  
The application diagram below (Figure 2) consists of two  
computers with RGB 118 and RGB 118 PLUS interfaces with  
access to a projector through a switcher.  
RGB 118  
MBC VGA/XGA HR  
RGB 118  
PLUS  
MBC MAC/QUADRA HR  
Large  
Screen  
Projector  
Figure 2  
Page 3-3  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
E
 t
Extron Switcher  
RGB 118  
Laptop  
MBC IBM PCC  
Computer  
LBC VGA  
RGB 118  
PC  
Computer  
RGB 118  
PLUS  
RGB 118  
RGB 118  
MBC VGA/XGA HR  
RGB 118  
PLUS  
MBC  
SPARC  
BUFFER  
PC  
Computer  
MBC IBM  
VGA/XGA HR  
MBC  
MAC/QUADRA HR  
Large  
Screen  
Projector  
NeXT,  
SGI  
or  
SUN  
WorkStation  
MAC  
Computer  
IBM PS2  
Computer  
Six different computer systems with RGB 118 and RGB 118 PLUS interfaces all have access to a projector through an Extron switcher in this application.  
Pgae3-5  
Large Screen Data Projector  
MBC VGA/XGA HR  
RGB 118 PLUS  
Universal Interface  
MBC IBM PCC  
Exrton•RGB118&RGB181PULS•Use’rsManula  
or  
MBC MAC/QUADRA HR  
 s
Data Monitor  
The above diagram illustrates the versatility of Extron’s 118 PLUS KIT (P/N in Appendix) which includes the following items:  
RGB 118 PLUS – MBC VGA/XGA HR – MBC MAC/QUADRA HR – MBC IBM PCC – T-VGA – MAC DFTA – BNC-4-12’ HR  
Extron’s RGB 118 & RGB 118 PLUS  
User’s Manual  
Appendix A  
Other Reference Material  
Computer Compatibility and MBC Cables  
Accessories and Part Numbers  
Glossary  
Limited Warranty  
A
Computer Compatibility and MBC Cables  
Compatible Computers  
Amiga 500,1000,2000  
Apple IIE/IIC  
MBC Cable Required  
MBC Amiga 2000  
MBC Apple IIE  
Horz. kHz Vert. Hz  
15.7  
15.7  
15.7  
22.3  
22.0  
35.5  
35-48  
26.0  
54  
60  
60  
60  
60  
60  
67  
67  
60  
60  
60  
60  
65  
65  
65  
60  
60  
63  
63  
73  
60  
68  
50  
60  
50  
70  
Apple IIGS  
MBC Mac II HR  
ICWK Mac RGB  
ICWK Mac SE RGB  
MBC Mac II HR  
MBC SuperMac  
MBC AT&T 6300  
MBC AT&T 630  
MBC B-25  
ICWK DEC 340  
MBC 3161/63/91/96 Mono 27.6  
MBC IBM 3162  
MBC IBM 3164  
MBC 3179/92/97  
MBC 3192D  
MBC IBM 3270 PC  
MBC IBM 3270 PCG  
MBC IBM 3290  
ICWK 3471/3476  
MBC IBM INFOWINDOW  
MBC 5291 M-2  
Apple Mac RGB (Internal Wiring Kit)  
Apple Mac SE RGB (Internal Wiring Kit)  
Apple Mac II Series (Standard Card)  
Apple Mac II w/ SuperMac Card  
AT&T 6300/6310  
AT&T 630  
Burroughs 25  
DEC 340  
IBM 3161,3163,3191,3196 Mono  
IBM 3162 Mono  
IBM 3164 Color  
IBM 3179,3192,3197 Color  
IBM 3192D Color  
IBM 3270 PC Color  
IBM 3270 PCG Color  
IBM 3290 Color  
IBM 3471/3476 Infowindow  
IBM 3472/3477 Terminals  
IBM 5291 M-2  
IBM PC or Compatible w/ CGA or EGA card  
IBM PC,XT,AT & Compatible w/ MDA Card MBC IBM PCM  
19.8  
31.5  
25.9  
27.6  
23.0  
23.0  
23.5  
24.0  
29.6  
31.0  
38.0  
18.3  
MBC IBM PCC  
15.7/21.8  
18.4  
IBM PC,XT,AT & Compatible w/ PGA Card  
IBM PS/2 VGA  
IBM PS/2 w/ 8514/A Card  
MBC IBM PGA HR  
MBC IBM PS/2  
MBC IBM VGA HR  
31.5  
31.5/35.5 60/70  
35.1 87/43  
31.5-<50.0 60/80  
IBM VGA/Super VGA/XGA or VGA Plus MBC IBM VGA HR  
Any Laptop w/ VGA output *  
(has no external monitor)  
NCR PC 6,8 Color  
NeXT Monochrome Computers  
NeXT Color Computers  
Sigma 400 Color  
LBC VGA HR  
31.5  
60/70  
MBC NCR PC 6,8  
MBC NeXT Cable  
MBC Sparc Buffer  
MBC Sigma 400  
23.6  
62.0  
63.0  
31.4  
63.8  
55  
68  
68  
60  
66  
Sun/Apollo Monochrome 9D Workstations MBC SUN/APOLLO  
(also requires ECL Buffer)  
Sun/Apollo Color Workstations  
or any Workstation w/RGB out on BNC Connectors.  
Sun Sparc Stations  
MBC RGB BUFFER  
64.0-<125.0 60  
MBC Sparc Buffer  
MBC XEROX 6085  
(also requires Xerox Buffer)  
64-89  
60/70  
76  
Xerox 6085 and 1186 Computers  
28.0/37.0  
*When using most laptops to display on large-screen projectors, the computer’s internal LCD display is  
deactivated.  
Page A-1  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Accessories and Part Numbers  
Extron Part  
Part Number  
RGB 118 (115 Volt) ................................................................. 60-080-01  
RGB 118 (230 Volt) ................................................................. 60-080-02  
RGB 118 PLUS (115 volt) ....................................................... 60-080-05  
RGB 118 PLUS (230 volt) ....................................................... 60-080-06  
118 PLUS Kit (115 volt) ........................................................... 42-018-01  
118 PLUS Kit (230 volt) ........................................................... 42-018-02  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Page A-2  
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.  
Page A-3  
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.  
Extron • RGB 118 & RGB 118 PLUS • User’s Manual  
Page A-4  

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