Black Box KV3000 User Manual download pdf (Page 38)

CHAPTER 4: Operation: Hardware and Keyboard Commands

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 4-3 below. (For the meaning of

quality numbers 3, 2, and 1, see the bottom of page 36.) 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) in IBM PC applications, Station

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.

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Black Box KV3000 User Manual Page 38