User manual

10
Cable Skew and Color Divergence Control
To reduce the amount of crosstalk between twisted pairs within a CAT-5 cable,
the rate of twist varies for each twisted pair. The rate of twist affects the length of
each twisted pair and is referred to as cable skew.
Normally, when a video signal with a single white line is displayed on the screen,
each color component (red, green, blue) combines with the other to create the
white line.
Normal video signal
However when extending a video signal over CAT-5, cable skew can cause each
color component to arrive at the destination (display) at different times. This
causes an undesirable effect known as color divergence, where one or more
color components are shifted to the left or right.
Video signal containing color divergence
(emphasized for illustrative purposes)
CONNECTING AND OPERATING
THE GEFEN VGA RS232 EXTENDER