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SERVSWITCH™
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 4-3 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 4-3. Video Quality vs. Distance for Coaxial Cables
Resolution
Distance 10 ft. 20 ft. 30 ft. 50 ft. 75 ft. 100 ft. 150 ft. 200 ft.
(3 m) (6.1 m) (9.1 m) (15.2 m) (22.9 m) (30.5 m) (45.7 m) (61 m)
640 x 480 33 3 3 3 3 2 2
800 x 600 noninterl. 33 3 3 3 3 2 2
1024 x 768 interlaced 33 3 3 3 3 2 2
1024 x 768 noninterl. 33 3 3 2 2 2 1
1280 x 1024 interlaced 32 2 2 2 1 1 1
1280 x 1024 noninterl. 32 2 1 1 1 1 1
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 200 feet (61 m), Station Extenders or CAT5
KVM Extenders might be required. Call Black Box for technical support to discuss
this option.
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.