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RACKMOUNT SERVSWITCH™ BRAND CAT5 KVM EXTENDER LOCAL HUBS
6.4 Adjusting the Video Compensation on Non-Micro Remote Units
For any given full-size (non-Micro) Remote Unit, you should only need to take the
steps in this section if the interconnect cabling between the Local Hub and the
Remote Unit is longer than 25 m (80 ft.). If the cabling isn’t that long, but the video
at the remote site still looks awful, first try adjusting the Remote Unit’s Brightness
and Focus dials. If the video looks bad no matter how you set these dials, the
problem is almost certainly being caused by bad wiring in your interconnect
cabling. Compare its pinning and pairing with those shown in
Appendix A
.
NOTES
For all practical purposes, cable equalization cannot be exact: The
remote video image will never be as sharp as the original. The Remote
Unit’s equalization system is designed to produce very good results on
short or medium-length cables and acceptable quality across very long
cables (those over 150 m [500 ft.] in length).
At any cable range, you can see how the video would appear without
any compensation at all by turning the Focus dial counterclockwise as
far as it will go.
1. Run an application you intend to use that requires a high screen resolution,
such as a Windows art or design program, a word processor or desktop-
publishing package, or even a graphics-intensive game.
2. If the video reaching the remote monitor is “undercompensated,” you will
notice black smearing on the right-hand edge of large horizontal objects such
as title bars. The degradation becomes more noticeable as cable length
increases.
3. Keep your eyes on a part of the image where the smearing is evident. Now,
turn the Remote Unit’s Focus dial clockwise, by hand or with a screwdriver,
until the smearing disappears and the edge becomes very bright and too
sharp. At this point and beyond the video is “overcompensated.”
4. Turn the Focus dial back slightly until you reach a point where the edge looks
as it should be (no smearing or over-sharpness). The compensation is now
adjusted correctly for the length of interconnection cable used. (If you can’t
seem to get the compensation close enough, and you’re running high-res
video to near the limits of the cable length that the Remote Unit is configured
for, see the note in
Section 5.2
.)
5. Use the Brightness dial to adjust the brightness of the overall picture. After you
do so, you might need to make a further slight adjustment with the Focus dial.
Once you’ve finished adjusting the video, your Rackmount Extender system should
be ready for continuous operation.
