MTPX Plus Series Setup Guide • Introduction
4
TP Skew Equalization
Skew exists between wire pairs when the physical length of one wire pair is different from
another. Skew affects the displayed image when the difference in length between wire pairs
exceeds 2 feet. The difference in length causes the timing of the red, green, and blue video
signals to appear out of alignment (horizontal registration errors). The signals transmitted on
the shortest pair are shifted to the left if you are using white lines on a black background.
A white vertical line on a black field can appear as individual red, green, and blue lines that
are close together; the signal transmitted on the shortest wire pair leads the other colors
and appears to the left on the display. As the transmission cable length increases, the skew
effect increases.
The MTPX Plus input and output skew equalizer functions provide separate time delay
circuits on the red, green, and blue video lines. This allows you to properly align the red,
green, and blue video signals on the displayed image. When correctly set, the red, green,
or blue video signal on the shortest wire pair is delayed to properly converge the displayed
video image.
UTP cable test equipment measures and reports wire pair length. The report on the various
pair lengths can be used to properly equalize pair skew. If UTP cable test measurement
cannot be done, pair skew can still be equalized by viewing a crosshatch test pattern with a
critical eye.
