Re: Remote monitor

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Tom Fuke (tom++at++war.reading.sgi.com)
Tue, 14 May 1996 18:47:07 +0100

Some questions for you:
 - What hardware (machine/monitor) are you using?
 - Is it a direct connection? Are you using one extension cable,
   or many connected end-to-end?
 - Exactly what kind of image are you seeing? Is the sync unstable,
   or are you seeing smearing/ghosting? Check that your monitor is
   terminated properly.
 - Are you seeing any EMI/ground loop effects? (rolling bars etc.)
   Check the ground connections of your machine and monitor.

Silicon Graphics supports direct connection of the RGB output to 75ft
(22m), using an X8-VKC1 cabling option available from the price list. I
have seen direct machine->monitor connection over longer distances using
good quality low-capacitance 75ohm video cable, although I cannot put an
exact figure on the distance.

Ideally you should use an RGB distribution amplifier capable of driving
the signals over that distance. This will also ensure that you don't risk
damaging the video output drivers of the workstation. The DA must have
enough bandwidth for the video formats you are using.

As a starting point I have found "Extron" DAs to be reliable - we use them
here at the Reality Centre, and at tradeshows - but please check with your
local Audio/Video supplier. FYI the Extron web page is
http://www.extron.com/

For a "high-end" solution, you might also look at a fibre-optic video
extension system (can drive signals of 1000s of feet without electrical
interference), such as the "Lightwave" product in the Silicon Graphics
Applications directory:
http://www.sgi.com/Products/appsdirectory.dir/Applications/Peripherals/ApplicationNumber7809.html

I hope this helps,

Kind regards,
Tom Fuke

-- 
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Tom Fuke                  email: tom++at++reading.sgi.com         -
The Reality Centre        vmail: 59101 (0800 896020 in U.K)  -
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