BNC connector is a connector used for coaxial cable, used for radio frequency signal transmission. Mainly used for coaxial analog cameras, SDI digital cameras, DVR video input/video output and other interfaces. According to the appearance, it is generally divided into two types: male and female.
BNC, the full name is Bayonet Nut Connector (Bayonet Nut Connector, this name vividly describes the shape of this connector), also known as British Naval Connector (British Naval Connector, may be the earliest use of this connector in the British Navy) or Bayonet Neill Concelman (Neill Concelman bayonet, named after its locking method and its inventor, Paul Neill of Bell Labs and Carl Concelman, an engineer from Amphenol.)
BNC connectors are available in 50 ohm and 75 ohm versions. When the 50 ohm connector is connected with other impedance cables, the possibility of transmission errors is less. Connectors of different versions are compatible with each other, but if the cable impedance is different, the signal may reflect. Usually BNC connectors can be used at 4GHz or 2GHz.