A video camera has a coaxial cable output. The video signal is to be distributed to devices that have balanced twisted pair inputs. The transition between these two different transmission media can be accomplished by using a:

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A balun (short for balanced-unbalanced) is a device that converts between balanced and unbalanced signals. In this case, the coaxial cable output of the video camera is an unbalanced signal, while the devices with twisted pair inputs require a balanced signal. By using a balun, the unbalanced signal can be converted to a balanced signal for distribution to the other devices.

A Video Camera Has a Coaxial Cable Output