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CHAPTER 4: Troubleshooting
4. Troubleshooting
4.1 Common Concerns
Here are some problems that can occur with the Video CCTV-A/V Hub and some
of their possible causes and solutions:
The Power LED doesn’t come on.
The hub’s probably not getting any power. Make sure that the hub’s power cord is
securely plugged into both the hub and a working AC outlet. If necessary,
temporarily plug another device into the outlet to make sure that the outlet works.
You get no video image or audio.
The UTP cable might be disconnected or broken, or there might be an open
wiring path or split or crossed twisted pairs. Try these remedies: Check all of your
UTP connections; verify wiring continuity with an ohmmeter; check the pinning
and pairing of your UTP cabling; and make sure the pinouts of all of the baluns
you’re using match the hub’s.
You get a distorted video image.
The signal polarity might be reversed; there might be a cable pinning, pairing, or
construction problem; or there might be a pinning mismatch between the hub and
baluns. Try these remedies: Verify that polarity is straight through on each A/V
channel; verify that the pinouts of all of the baluns you’re using match the hub’s;
check the pinning and pairing of your UTP cabling; and make sure that the pairs
in your UTP cabling are fully twisted up to the connection points.
The picture is clear but has lost color.
The end-to-end link is probably suffering excessive signal loss. Make sure that your
cable connections are secure; that your equipment and cables are well away from
neon and fluorescent lights, generators, electric motors, high-voltage lines, and
other sources of high-voltage or high-frequency electromagnetic signal; and that
you’re not trying to run your UTP cabling too far. (The maximum distance over
which the hub and baluns can transmit and receive video signals depends on your
cable and your video and audio equipment; refer to the
Maximum Distance
specification in
Chapter 1
.)
