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CHAPTER 4: Operation
By contrast, coaxial cables (required for XGA applications, and recommended for
most other applications) do much better at maintaining video quality, as shown in
Table 4-2 below. (For the meaning of quality numbers 3, 2, and 1, see the bottom
of page 22.) As before, the distances in the table are total cable lengths measured
from the CPU to the monitor.
Table 4-2. Video Quality vs. Distance for Coaxial Cables
Resolution
Distance
20' (6.1 m) 30' (9.1 m)
55' (16.8 m)
640 x 480 333
800 x 600 noninterlaced 333
1024 x 768 interlaced 333
1024 x 768 noninterlaced 333
1280 x 1024 interlaced 333
1280 x 1024 noninterlaced 332
1600 x 1280 noninterlaced 321
CAUTION!
Some CPUs can’t drive or receive keyboard and mouse signals across
longer runs of coaxial cable. Consult with the manufacturers of your
CPUs before installing this cable in lengths greater than 20 ft. (6.1 m).
For CPU-to-monitor distances over 55 feet (16.8 m), you might require different
cabling or an Extender system such as our Station Extender or CAT5 KVM
Extender (see Appendix B). Please call Black Box Technical Support to discuss
your application.
One last note of caution about video: The IBM 9515, 9517, and 9518 monitors
that come with some PS/2 systems are not normal VGA monitors and require
special cabling in order for video to be correctly sized and synchronized. Call Black
Box for technical support if you want to use one of these monitors.
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