ADDER ALIF2002 Guida Utente Scaricare il pdf (Pagina 28)

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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.

VGAto-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

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 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 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.

• ReplaceoldVGAadaptersonhostcomputerswithDVIvideocards.

Problem: The audio output of the ALIF receiver sounds like a scratched

record.

This issue is called Audio crackle and is a symptom of the same problem that

produces blinding (see previous page). The issue is related to missing data

packets.

Remedies:

As per blinding discussed previously.

Problem: AIM cannot locate working ALIF units.

There are a few possible causes:

• TheALIFunitsmustberesetbacktotheirzerocongIPaddressesforAIM

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.

• ThiscouldbecausedbyLayer2CiscoswitchesthathaveSpanning Tree

Protocol (STP) enabled but do not also have portfast enabled on the ports

to which ALIF units are connected. Without portfast enabled, ALIF units will

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: When you plug the link cable from a working ALIF unit into the switch

port, check how long it takes for the port indicator to change from orange

to green. If it takes roughly one second, portfast is on; if it takes roughly

thirty seconds then portfast is disabled.

Remedies:

• EnsurethattheALIFunitsandtheAIMserverarelocatedwithinthesame

subnet. AIM cannot cross subnet boundaries.

• Manually reset the ALIF units to their zero conﬁg IP addresses.

• Enableportfast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.

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