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using the OSI model which layer defines the type of media to be used and defines the representation of data on the medium
Layer 6 Presentation layer
Layer 2 Data Link Layer
Layer 1 Physical Layer
Layer 3 Network Layer
Physical layer defines the electrical and physical specifications of the data connection. It defines the relationship between a device and a physical transmission medium (e.g., a copper or fiber optical cable, radio frequency). This includes the layout of pins, voltages, line impedance, cable specifications, signal timing and similar characteristics for connected devices and frequency (5 GHz or 2.4 GHz etc.) for wireless devices. It is responsible for transmission and reception of unstructured raw data in a physical medium. It defines transmission mode i.e. simplex, half duplex, full duplex. It defines the network topology as bus, mesh, or ring being some of the most common. It mostly deals with raw data.
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