Physical Layer or Layer 1 of the OSI model, what we got here is a media type and connector or in other words hardware and transmission. Layer 1 provides procedural interface for transmission which means it is responsible for sending (signalling) of raw bits of data.
Layer 1 hardware: NICs, Hubs, Repeaters, Cables, Fibre optics, Radio waves
Examples of what is happening at layer 1:
- Autonegotiation
- Carrier sense and collision detection (used by Layer 2)
- Modulation
- Circuit switching
- Bit-by-bit or symbol-by-symbol delivery
- Multiplexing
- Forward error correction
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