F
Video image compensation
The X-DVI modules use a special two-part compensation technique to overcome
the effects of long cable lengths upon the digital video signal. Under your
control, the local and remote modules apply their own adjustments to the video
signal. The local module applies
Pre-emphasis
to the video signal while the
remote module uses
Equalisation
to return the signal to levels suitable for use at
the connected DVI monitor.
Using the keyboard connected to the remote module, you can choose from
eight different video compensation settings (each setting affects both the local
and remote modules) to achieve the best results. In certain cases there may be
no image at the remote monitor until the appropriate compensation setting is
chosen.
Note: The effects of video compensation will only be noticeable on longer link
cables lengths and/or higher video resolutions.
To adjust the video image
1 Connect the X-DVI modules to the computer and peripherals as discussed
earlier in this chapter. Power on the remote module and switch on the
computer.
2 On the keyboard connected to the remote module, simultaneously press the
and
keys to enter Configuration mode - the three indicators
(Num Lock, Caps Lock and Scroll Lock) on the keyboard should flash slowly
in sequence.
3 Press the key to begin Compensation - the Scroll Lock indicator on the
keyboard should flash.
4 Press the key to select the first compensation setting. Allow a few
seconds to elapse in order to give time for the compensation mode to
change and the video monitor time to adjust itself to the new signal.
Note: In some cases the video image may disappear completely as the video
monitor fails to decipher the signal. If this occurs, continue to follow these
instructions until the best compensation setting is achieved.
5 If necessary, repeat step 4 using keys to , remembering to allow a few
seconds after each press to allow the modules and video monitor to react.
6 When the best video image compensation is achieved, press the
key to
save the settings and return to the normal Configuration mode. The three
indicators on the keyboard should once again flash slowly in sequence.
7 Press the
key again to exit from the Configuration mode.