User manual

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.

Why does the CAT5 sender unit have a HDMI connector on the input?

A HDMI connector was used on the input to optimize space on the board by using the

smaller connector. HDMI is electrically equivalent to DVI-D.

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. 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 9).

I’m getting no video on the screens using ADC to DVI adapters, what is wrong?

ADC to DVI adapters remove the necessary 5V line that the extenders require on the input

to operate. To enable the 5V you will need to open up the sender unit. Next to each DVI/

HDMI input connector will be a jumper that needs to be shorted to enable 5V to the input.

This should only be enabled when using a ADC to DVI Adapter otherwise damage to your

video card may result.

How can I ﬁ x the ﬂ ickering picture?

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 9 for the different

combinations.

Can I run the CAT-5 cable through a patch bay?

No, the signal will not transmit reliably

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