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What is Inside the CCTV Balun?
The CCTV Balun is the essential link between the CCTV equipment and the structured cabling system. Used in pairs, the CCTV balun allows CCTV video to be transmitted via UTP without visible picture interference or distortion. The word balun is short for Balanced to Unbalanced. The balun converts an unbalanced signal (coax) to a balanced one (UTP) as illustrated in the diagram below.
Balanced to Unbalanced
The unbalanced signal is protected by an outer shield. The shield stops any outside interference that hits the cable. UTP, on the other hand, does not have a shield to protect against interference.
Therefore, the signal must be converted to a balanced one. The balun, used in pairs, performs this function. In essence the baluns function as noise eliminators so that any interference that impinges on the individual twisted pair wires is cancelled out by the baluns.
The result is that the UTP link is more immune to interference and the CCTV picture quality is transmitted reliably over extended distances. The CCTV Balun functions as a common mode choke to help eliminate low frequency hum.
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