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Problem: AIM cannot locate working ALIF units.
There are a few possible causes:
• TheALIFunitsmustberesetbacktotheirzerocongIPaddressesforAIM
discovery. If you have a working network of ALIF’s without AIM and then
add AIM to the network AIM will not discover the ALIFs until they are reset
to the zero config IP addresses.
• ThiscouldbecausedbyLayer2CiscoswitchesthathaveSpanning Tree
Protocol (STP) enabled but do not also have portfast enabled on the ports
towhichALIFunitsareconnected.Withoutportfastenabled,ALIFunitswill
all be assigned the same zero config IP address at reboot and AIM will only
acquire them one at a time on a random basis.
You can easily tell whether portfast is enabled on a switch that is running
STP:WhenyouplugthelinkcablefromaworkingALIFunitintotheswitch
port, check how long it takes for the port indicator to change from orange
togreen.Ifittakesroughlyonesecond,portfastison;ifittakesroughly
thirty seconds then portfast is disabled.
Remedies:
• EnsurethattheALIFunitsandtheAIMserverarelocatedwithinthesame
subnet. AIM cannot cross subnet boundaries.
• ManuallyresettheALIFunitstotheirzerocongIPaddresses.Pleasereferto
the ALIF user guide for details.
• Enableportfast on all switch ports that have ALIF units attached to them
or try temporarily disabling STP on the switches while AIM is attempting to
locate ALIF units.
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 traffic by transmitting
onlythepixelsthatchangebetweensuccessivevideoframes.Whendithering
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 traffic 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 Macs (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 PCs, contact technical
support for assistance.
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