Passive CCTV Hub Installation Guide
Page 18
4.
Troubleshooting
The following chart describes some of the problem symptoms, the probable causes and possible
solutions. If the information below does not solve the problem, please contact Black Box
Technical Support.
Picture
Probable Causes
Possible Solutions
No video image
•
Power-off.
•
Check power supplies of CCTV
equipment. Check power supply fuse.
•
Wrong pin
configuration
•
Check pin configuration and verify
straight-through wiring.
•
Defective CCTV
Balun
•
Change CCTV baluns for another pair.
Poor image quality,
distortions, interference
•
EMI interference
•
Wires reversed on
signal pair on one
side
•
Split pair
•
Check that wiring is not too close to
transformers and lighting ballasts
•
Make sure that the wires on the signal
pair are not reversed on one side.
•
Check if the UTP pairs are correct (not
split)
Picture loses color, faded
or weak
•
Exceeded distance
specifications
•
Lower grade UTP
cable is introducing
high losses
•
Check DC loop resistance and verify if
distance spec is exceeded
•
Reduce cable length or eliminate high-loss
components
•
Replace cable by higher grade
•
Wires reversed on
signal pair on one
side
•
Make sure that the wires on the signal
pair are not reversed on one side.
•
Split pair
•
Check if the UTP pairs are split and
correct. Each signal pair must be twisted.
•
Lower grade UTP
cable is introducing
high signal losses.
•
Use signal repeater for extended distance
or replace cable by higher grade.
No power or intermittent
power at camera
•
Wrong pin
configuration.
•
Check wiring
•
Distance exceeded
•
Verify distance specifications for remote
power. Move power closer to camera.
PTZ controls not
responding
•
Wrong pin config
•
Check wiring.
When contacting Black Box Technical Support at 724-746-5500, please have the following
information ready: Unit model number, cabling lay-out, model of camera and DVR used, power
supply voltage, camera wattage, cable length, cable type, description of problem, list of tests
performed.
