Frequently Asked Questions - Gefen EXT-DVI Audio-Cat5 User Manual

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Frequently Asked Questions

What kind of CAT-5e cable should I be using?
Solid core CAT-5e cable rated at 350 Mhz and terminated in 568a or 568b is the
minimum requirement. For resolutions greater than 1280x1024 or 1080i, Gefen
recommends solid CAT-6 cables.
I'm getting no video on the screens, what can I check?
First thing to check is make sure that the video CAT5 is linked to the other video CAT5
port and the same with the DDC ports. Try removing the power supply from the receiver
side, if the power light turns off then you have your CAT-5 cables crossed. In some
setups with grounding issues you will not get a picture with the receiver powered. Test
to make sure the units are working with short CAT-5e cables 15-20 feet. You can also
make sure you have the correct boost setting confi gured (refer to page 5).
Occasionally the picture blanks out, how do I fi x this?
Flickering or a blinking image is the result of a loss of sync between the display
and the source. Try lowering the resolution to see if that helps, if it does, the CAT-5
cables you are using are unable to handle the bandwidth of the higher resolution
and thus you are losing sync. Try a shielded CAT-6 cable on the video line to reduce
interference. You can also try adjusting the service switches. Usually this is caused
by EMI and a shielded CAT-6 with metal RJ-45 connectors with the drain wire
soldered to the connectors will resolve the issue. Please refer to the service switch
guide on page 5 for the different combinations.
Why is there a green or pink tint to my picture?
A tint of green or pink in the picture is a result of incorrect colorspace being transmitted.
This can be resolved by recycling power on your devices including the extender. If this
does not help, the DDC data containing the colorspace is not being transmitted correctly
due to loss in the CAT5 cable, try replacing the DDC cable.
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