BNC is an abbreviation for British National Connector. It is a connector for coaxial cables that locks when one connector is inserted into another and rotated 90 degrees. It was originally designed in England for television antennas. You can see them on 10base2 networks where BNC connectors are installed onto 10base2 network cards within the workstation. They are easy to install and reliable with little video signal loss. They have largely been replaced by newer Ethernet devices whose wiring does not use coaxial cable.
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