© MuxLab Inc.
CATV Distribution Hub Installation Guide
Page 14
4.
Troubleshooting
The following table describes some of the problem symptoms, the probable causes and
possible solutions. If the information below does not solve the problem, the technical
support contact information can be found at the end of this section.
Picture
Power
LED
Probable Causes
Possible Solutions
No image
OFF
Power off
Check power supplies of CATV equipment
No image or
very noisy
ON
Wrong pin configuration
Check pin configuration and verify straight-
through wiring
Picture snowy
ON
Exceeded distance/bandwidth
specifications
Lower grade UTP cable is
introducing high losses
Insufficient signal strength at input
Check if distance spec is exceeded
Reduce cable length.
Replace cable by higher grade
Check level
Horizontal
upward moving
bands
ON
Ground loop problem.
Isolate CATV receiver from local ground.
Some channels do
not come in
ON
Bandwidth limitation
Check that the channel frequency is within the
bandwidth limitation of the baluns and hubs
Internet not
functioning
ON
Unsupport by CATV system
Ensure that all RF components support bi-
directional transmission
Over bright image ON
Signal strength too high
Attenuate signal by reducing amplifier gain or
by moving internal jumper.
When contacting your nearest MuxLab dealer or MuxLab Technical Support please have
the following information ready:
•
Unit model number.
•
Cabling lay-out. Include model of
CATV receiver, cable modem, cable
length and type.
•
Description of problem.
•
List of tests performed.
