BNC (Bayonet Neil-Concelman or British Naval Connector)

Contributor(s): Dennis Sheffield and Michael Wallette

A BNC (Bayonet Neil-Concelman, or sometimes British Naval Connector) connector is used to connect a computer to a coaxial cable in a 10BASE-2 Ethernet network. 10BASE-2 is a 10 MHz baseband network on a cable extending up to 185 meters - the 2 is a rounding up to 200 meters - without a repeater cable. 10BASE-2 Ethernets are also known as "Thinnet", "thin Ethernet", or "cheapernets". The wiring in this type of Ethernet is thin, 50 ohm, baseband coaxial cable. The BNC connector in particular is generally easier to install and less expensive than other coaxial connectors.

A BNC male connector has a pin that connects to the primary conducting wire and then is locked in place with an outer ring that turns into locked position.

Different sources offer different meanings for the letters BNC. However, our most knowledgable source indicates that the B stands for a bayonet-type connection (as in the way a bayonet attaches to a rifle) and the NC for the inventors of the connector, Neil and Concelman.

This was last updated in August 2005

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This definition is older than dirt, and even less useful.  BNC connectors are used primarily (nowadays) in professional analog and digital audio and video applications, such as NTSC/PAL video, AES3 digital audio and SDI digital video.  I haven't seen an in-situ application of 10BASE-2 since the early 90s when it all went to CAT5.
The Bayonet Neill-Concelman Connector (BNC connector) is a type of coaxial RF (Radio frequency) electrical connector that is used in place of coaxial connectors.