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{{short description|electrical or optical connectors for carrying audio and video signals}}
{{Refimprove|date=February 2009}}
'''Audio connectors''' and '''video connectors''' are [[electrical connector|electrical]] or [[optical fiber connector|optical connectors]] for carrying [[audio signal|audio]] and [[video signal]]s. '''Audio interfaces''' and '''video interfaces''' define physical parameters and interpretation of signals. For [[digital audio]] and [[digital video]], this can be thought of as defining the [[physical layer]], [[data link layer]], and most or all of the [[application layer]]. For [[analog audio]] and [[analog video]] these functions are all represented in a single signal specification like [[NTSC]] or the direct [[Loudspeaker|speaker]]-driving signal of analog audio. Physical characteristics of the electrical or optical equipment includes the types and numbers of wires required, voltages, frequencies, optical intensity, and the physical design of the connectors. Any data link layer details define how application data is encapsulated (for example for synchronization or error-correction). Application layer details define the actual audio or video format being transmitted, often incorporating a [[codec]]s not specific to the interface, such as [[PCM]], [[MPEG-2]], or the [[DTS Coherent Acoustics codec]]. In some cases, the application layer is left open; for example, [[HDMI]] contains an [[Ethernet]] channel for general data transmission.
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[[File:BNC connector.jpg|thumb|left|Male 50 ohm BNC connector]]
The [[BNC connector|BNC]] (Bayonet Neill Concelman)<ref>{{cite web |url=https://www.techopedia.com/definition/727/bayonet-neill-concelman-connector-bncconnector |title=Bayonet Neill-Concelman Connector (BNC Connector) |access-date=2021-05-20 |website=Techopedia}}</ref> connector is a very common type of RF connector used for terminating coaxial cable.
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