User guide

10
Troubleshoong
Problem: The mouse pointer of the ALIF
receiver is slow or sluggish when moved
across the screen.
This issue is often related to either using
dithering on the video output of one or
more transmitting computers or using
VGA-to-DVI video converters.
Dithering is used to improve the perceived
quality and colour depth of images by
diffusing or altering the colour of pixels
between video frames. This practice is
commonly used on Apple Mac computers
using ATI or Nvidia graphics cards. VGA-
to-DVI converters unwittingly produce a
similar issue by creating high levels of pixel
background noise.
ALIF units attempt to considerably reduce
networktrafcbytransmittingonlythe
pixels that change between successive
video frames. When dithering is enabled
and/orVGA-to-DVIconvertersareused,
this can have the effect of changing almost
every pixel between each frame, thus
forcing the ALIF transmitter to send the
whole of every frame: resulting in greatly
increasednetworktrafcandwhat’s
perceived as sluggish performance.
Remedies:
•LinuxPCs
Check the video settings on the PC. If
the Dither video box option is enabled,
disable it.
• AppleMacwithNvidiagraphics
Use the Adder utility for Mac’s – Contact
technical support.
• AppleMacwithATIgraphics
Use the ALIF 2000 series unit with Magic
Eyeditherremovalfeature.
• WindowsPCs
If you suspect these issues with PC’s,
contact technical support for assistance.