Troubleshooting
Symptom Causes
Possible
Solutions
No signal
No continuity in
video link
Verify cable continuity between pairs of
baluns.
Verify the max distance has not been
exceeded.
Verify the audio, video, and control
cables between the equipment and
hardware are connected and pass signal.
No signal
Power off
Check power supplies of video
equipment.
Verify the LEDs on both the send and
receive units are illuminated.
No signal
Improper
connection or
swapped pairs
Check that baluns are connected to
correct video inputs and outputs.
Verify both ends of the twisted pair
cable conform to the EIA 568B crimp
pattern.
Unusual colors
Rolling signal
Horizontal
video bars
Improper
grounding or
cable type
Verify the source and destination
devices are grounded. Different
electrical circuits may cause a voltage
differential on the building’s electrical
ground plain. The video display or
source deceive may need to be
grounded.
No control
Simultaneous
RS232 and IR
Verify only IR
or
RS232 are being used.
Background
pattern
EMI interference Identify possible radiating frequency
sources (i.e.; wireless LANs, switching
power supplies) and isolate them.
Replace any unshielded twisted pair
cable with shielded twisted pair cable.
Summary of Contents for DIGI-VGASD-R
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