The lowest-level electronic or optical transmission functions of a network
Also known as OSI layer 1 · layer 1
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5 identifiers linking physical layer across the web's reference databases
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In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer: the layer most closely associated with the physical connection between devices. The physical layer provides an electrical, mechanical, and procedural interface to the transmission medium. The shapes and properties of the electrical connectors, the frequencies to transmit on, the line code to use and similar low-level parameters are specified by the physical layer.