Black Box ServSwitch manual Video quality vs. distance for original Serv cables

CHAPTER 3: Installation and Preconfiguration

The Matrix ServSwitch will support SVGA (Super VGA) video, but with original Serv cables the video quality can decrease at higher resolutions and distances. Table 3-2 illustrates this. The distances in the table are total lengths of CPU Cable and User Cable (but not Expansion Cable) measured from the CPU to the monitor. The table assumes that one Matrix ServSwitch is between the CPU and monitor; in a daisychained application with multiple Matrix ServSwitches between the CPU and monitor, video quality will always be lower.

This table also applies to Mac video in Matrix ServSwitch systems in which the Mac version of the original Serv type CPU Cable (product code EHN215) has been installed.

Table 3-2. Video quality vs. distance for original Serv cables.

Distance	5' (1.5 m)	10' (3 m)	15' (4.6 m)	20' (6.1 m)	25' (7.6 m)
Resolution
640 x 480	3	3	3	3	3

800 x 600 noninterlaced

3

3

3

3

2

1024 x 768 interlaced

3

3

3

2

2

1024 x 768 noninterlaced

3

3

2

2

2

1280 x 1024 interlaced

3

2

2

2

1

1280 x 1024 noninterlaced

2

2

2

1

1

1600 x 1280

2

2

1

1

1

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

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