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.
I can’t seem to get my RS-232 devices to detect and connect, what’s wrong?
The DVI RS232 Extender only extends the Tx and Rx lines of RS232. If you need full
RS232 extension of every line, you will need the standalone RS232 Extender units.
Can I run the CAT-5 cable through a patch bay?
No, the signal will not transmit reliably
TROUBLESHOOTING
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