physical layer.
the lowest-level electronic or optical transmission functions of a network
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About physical layer
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.
Everything about physical layer →- Website
- https://www.iso.org/ics/35.100.10/x/