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CHAPTER 4: Configuration
To determine which of the color signals carried on your extender system’s CAT5,
CAT5e, or CAT6 cable you need to delay, take the steps below. Once you’ve
determined which colors need to be delayed for a particular cable, simply adjust
the delay on those colors by an amount of time appropriate for the length of that
cable.
NOTE
The maximum amount of skew correction (delay) that the Delay Line
Module can be set for is 36 ns. This should be sufficient for the vast
majority of installations. If your application appears to require more
correction, please consult
Appendix A
before contacting technical
support.
1. If you haven’t already done so, set up your extender system, installing the
Delay Line Module as described in
Chapter 3
. If the extender system’s
equalization can be adjusted, do so to obtain the best picture possible.
2. Run a text-editor program and open a window set to show black text (in a very
large font) on a white background. Type in some text.
3. If there is a skew problem in your extender system that can be alleviated with
the Delay Line Module, you will see color fringing on the edges of each
character. The wider the fringe, the more delay will be required.
Colors that are fringing on the right-hand side of your typed characters
are arriving before those on the left. A common example: If each character
has a green fringe on the right and a magenta (reddish purple) one on the
left, green is arriving ahead of red and blue, so some delay needs to be added
to the green channel.
4. Use Table 4-1 on the next page as a starting guide as to which colors need to
be delayed. Switch in delays until you get a satisfactory image. We recommend
that you start with a delay of 18 ns and then increase or reduce the delay as
required.
5. After delaying the main color(s) suggested, you might be left with a residual
fringe of another color that requires a small amount of delay (such as 3 or
6 ns) to be added to obtain a clear picture.
6. Once you’ve finished adding delay and are satisfied with the color quality of
the image, readjust the extender’s equalization to sharpen the picture and
compensate for any additional signal attenuation introduced by the Delay
Line Module.
