BNC, short for Bayonet Neill-Concelman, is a type of RF (radio frequency) connector used in electronics and technology systems, including video and radio communications. It gets its name from the design’s inventors, Paul Neill of Bell Labs and Carl Concelman of Amphenol, and its distinctive bayonet style of attachment, which is similar to the way a bayonet attaches to a rifle. A BNC connector is a cylindrical plug with a rotating ring on the outside. The ring has small notches or slots that correspond to pins or tabs on the female connector. To connect the two pieces, you align the pins with the notches, push the connectors together, then twist the ring to lock them in place. This system secures the connection, which is important in situations where a loose cable could disrupt a critical signal or even damage the equipment.

What are the best uses for BNC?

In video technology, BNC connectors are mostly used in professional video equipment because of their high reliability, durability, and ability to maintain a solid connection. They’re often found on cameras, monitors, and video switchers, connecting coaxial cables that carry video signals between devices. Coaxial cable, used in conjunction with BNC connectors, is a type of cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield, often with an outer layer of insulation. This design blocks outside interference which keeps the video signal clear and strong over long distances. BNC connectors can carry both analog and digital signals, so they work with a wide range of video technologies, from older analog CCTV systems to modern digital video broadcasting. They’re more commonly associated with analog systems, while newer digital systems often use different types of connectors. Despite this, some high-end digital video applications still use BNC connectors because of their reliability and the quality of signal transmission. In broadcasting, SDI (Serial Digital Interface) systems often use BNC connectors to transmit high-definition video signals. One of the notable advantages of BNC connectors is how easy they are to use. The bayonet lock design allows for quick, easy connections and disconnections, without needing to tighten or loosen small screws or bolts. This can be a significant time-saver in situations where equipment needs to be set up or broken down quickly, such as in live broadcasting or on a movie set.


The BNC connector is a reliable, robust, and easy-to-use technology that plays an essential role in video signal transmission. While it may not be the most modern connector type, its proven performance and broad compatibility make it an important part of many video technology systems.

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