BNC / Composite Video Format

This is the most basic type of video format used commercially. In this format, both the signals, i.e. Luminance and Chrominance are transmitted on a single cable. It is basically a co-axial cable. The centre-most wire is the line that conducts video signal. It is surrounded by an insulating material. On this insulating material is wound the ground wire in form of a mesh. Finally, this ground wire is covered by the outermost insulation. It is also called Composite Video format because the video signal is composite in nature, i.e. both the signals are conducted on the same single wire. Most economic format, BNC is also the most reliable because of its sturdy design. But the BNC format also has its own disadvantages. The biggest disadvantage of this format stems from the fact that a single wire transmits both the signals. The same wire conducting both the signals causes lots of interference which leads to loss in image quality.