“BALUN” is the short form for “Balance-Unbalance”. It is the solution to achieve longer and better signal transmission.

BALUNs allow the transmission of video using ordinary unshielded twisted pair(UTP) cable instead of traditional expensive coaxial cable. When a video signal is transmitted thru coaxial cable, the distance traveled by the signal is limited in part because the signal is in the form of an un-balanced signal which is susceptible to Electromagnetic/Radio Frequency Interference or "noice". BALUNs transform the video signal into a balanced form in which each wire in the twisted pair transmits an identical signal but with opposite polarized magnetic fields. Noice affects each signal equally and when combined, the noice is cancelled out. In combination with a properly designed BALUN, UTP cable can transmit video for much longer distances than coaxial cable.

Some usage of data transmission require high quality and long distance transmission, the best example should be CCTV (Closed-Circuit television) system. The existing approach for such practice is coaxial cabling. However, the fee for the installation of coaxial cabling is very costly. Even it can be affordable, the cable is not flexible enough to fit the infrastructure of high density buildings and offices. Also, the quality of the image after a long distance transmission will be degraded.

Using BALUN with Unshielded Twisted Pair (UTP) wire provide a solution for high quality and long distance transmission. During transmission, the signals in the wire will be interfered. Signals in the two cables will get the same interferences. Thanks to the BALUN technology, it recognizes the common interferences in the cable pair. With the findings of interferences, BALUN stop them to reach the receiving side. So, all the transmitted data will carry an interference-free signal. Thus, in CCTV application, we can get a high quality image through a long distance transmission.