Chapter 3: Installation
35
Coaxial cables (required for XGA applications and recommended for
most other applications) do much better at maintaining video quality, as shown in
Table 4-3 below. (For the meaning of quality numbers 3, 2, and 1, see the bottom
of the previous page.) As before, the distances in the table are total cable lengths
measured from the CPU to the monitor. Also as before, the table assumes a single
ServSwitch is between the CPU and monitor; if there is a submaster as well, video
quality will always be lower.
Table 4-2. Video Quality vs. Distance for Coaxial Cables
Quality 3 = Near perfect; screen defects are not conspicuous
Quality 2 = Good to very good; images are clear; there are small reflections
around text lettering depending on the color; screen defects are
sometimes conspicuous
Quality 1 = Fair to poor as distance increases; images run from slightly fuzzy to
badly smeared; text runs from fuzzy but readable to completely
washed out
Distance
Resolution
10 ft.
(3 m)
20 ft.
(6.1 m)
30 ft.
(9.1 m)
50 ft.
(15.2 m)
75 ft.
(22.9 m)
100 ft.
(30.5 m)
150 ft.
(45.7 m)
200 ft.
(61 m)
640 x 480
3 3 3 3 3 3 2 2
800 x 600 non-interl.
3 3 3 3 3 3 2 2
1024 x 768 interlaced
3 3 3 3 3 3 2 2
1024 x 768 non-interl.
3 3 3 3 2 2 2 1
1280 x 1024 interlaced
3 2 2 2 2 1 1 1
1280 x 1024 non-interl.
3 2 2 1 1 1 1 1
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