3.
At the video display end, connect a Quad Video Balun to the video input using
the appropriate number of RCA or BNC-terminated cables.
4.
Complete the connection between the two baluns, using standard Cat5 twisted
pair cable and connecting hardware, terminated on RJ45 plugs at both ends.
Ensure that there are no split pairs or taps.
5.
Power-on the video equipment. Check the image quality and refer to the
troubleshooting table below if the image quality is unsatisfactory. The following
diagram shows a typical installation.
Troubleshooting
The following tables describe some of the symptoms, probable causes and possible
solutions in respect to the installation of the Quad Video Balun. If you still cannot
diagnose the problem, please call Black Box Tech Support at 724-746-5500.
Symptom
Probable Causes
Possible Solutions
No video
No continuity in video link Verify cable continuity between pairs of
baluns.
No video
Power off
Check power supplies of video
equipment.
No video
Improper connection
Swapped pairs
Check that baluns are connected to
correct video inputs and outputs.
Unusual colors
Reversed polarity
Check wiring and ensure straight-
through polarity
Background pattern
EMI interference
Identify possible radiating frequency
sources (ie; wireless LANs, switching
power supplies) Try to isolate them
from the video connection.
Use shielded twisted pair grounded at
both ends.
Smearing
Exceeded distance
Verify cable grade. Use higher grade
cable if necessary.
Weak contrast
Exceeded distance
Verify cable grade. Use higher grade
cable if necessary.
Increase contrast on monitor.
Weak contrast
Unusual link attenuation
Verify cable distance using ohmmeter
or cable tester.
Image not stable
Defective link or
equipment
Verify video equipment interface
integrity.
Horizontal bars
moving slowly
Substantial crosstalk
between multiple video
sources
Consecutively turn off other video
sources to determine which video
source is the cause of interference.
Snowy picture
Distance is near limit
Verify cable grade. Use higher grade
cable if necessary.
Reduce color intensity at monitor.
