AdderLink X-Series
Installation and Use
Page 42
example, an installation running a screen resolution of 1024 x 768 over 50 metres of
Cat 5 cable will probably exhibit minimal colour split whereas an installation running
a screen resolution of 1600 x 1200 over 100 metres of Cat 6 cable will probably
exhibit some noticeable colour split.
6.3
Correcting colour split
If you have a noticeable problem with colour split then you have several choices.
You could use a shorter length of twisted pair cable or a different type of twisted pair
cable. Alternatively you could reduce the screen resolution that you are using. If
none of these are possible then the colour split may be corrected using the X-Series
skew compensator. The skew compensation unit is inserted into the twisted pair
cable connection between the local transmitter and remote receiver as shown in
figure 11.
For the technically minded . . .
The X-Series KVM extender will report the length difference between the pairs that
are used to carry the red, green and blue colour signals (see section 6.4). This
length difference can be used to calculate the colour split effects. Each metre of
cable represents 5 nanoseconds of delay. A rough estimate of the time for each
screen pixel may be calculated by multiplying the horizontal pixels by the vertical
pixels by the refresh rate and then dividing 1 by the result. If the delay time is
greater than the pixel time, colour split will be noticeable.
For example, if the maximum reported length difference is 1.5 metres then the delay
between colour signals will be 1.5 x 5 nanoseconds = 7.5 nanoseconds. If the
screen resolution being used is 1024 x 768 x 75 Hz then a rough estimate of the
pixel time is 1 / (1024 x 768 x 75) = 16.9 nanoseconds. Consequently the colour split
will be less than half a pixel time and so is unlikely to be noticeable.
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