Black Box ServSwitch manual Video quality vs. distance for coaxial cables

MATRIX SERVSWITCH™

By contrast, coaxial cables (standard for Sun applications, required for XGA applications, and recommended for most other applications) do much better at maintaining video quality, as shown in Table 3-3. (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 adapter-cable lengths (not including Expansion Cable) measured from the CPU to the monitor. Also as before, the table assumes a single Matrix ServSwitch is between the CPU and monitor; if there are other chained Switches as well, video quality will always be lower. (Where “interlaced” or “noninterlaced” isn’t specified, noninterlaced video is implied.)

Table 3-3. Video quality vs. distance for coaxial cables.

Distance

Resolution

10 ft.	20 ft. 30 ft.	50 ft.	75 ft.	100 ft.	150 ft.
(3 m)	(6.1 m) (9.1 m)	(15.2 m)	(22.9 m)	(30.5 m)	(45.7 m)

200ft. (61 m)

640 x 480

3

3

3

3

3

3

3

3

800 x 600

3

3

3

3

3

3

3

2

1024 x 768 interlaced

3

3

3

3

3

3

2

2

1024 x 768 noninterl.

3

3

3

3

3

2

2

1

1280 x 1024 interlaced

3

3

3

3

2

2

1

1

1280 x 1024 noninterl.

3

3

3

2

2

1

1

1

1600 x 1280

3

3

2

2

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).

If all of your CPUs are IBM PC compatible, and you want to drive signals across CPU-to-Switch or Switch-to-monitor distances over 100 feet (30.5 m), you might require Station Extenders or CAT5 KVM Extenders (see Appendix B). Please call Black Box Technical Support to discuss your application.

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