The physical layer is concerned with the transmission and reception of the unstructured raw bit stream over a physical medium, It describes the electrical/optical, mechanical and functional interfaces to the physical medium, and carries the signals for all of the higher layer.
The major functions and services performed by the Physical Layer are:
1.Establishment and termination of a connection to a communication medium.
2.Participation in the process whereby the communication resources are effectively shared among multiple users. For example, contention resolution and flow control.
3.Modulation, or conversion between the representation of digital data in user equipment and the corresponding signals transmitted over a communications channel. These are signals operating over the physical cabling (such as copper and optical fibers) or over a radio link.
The major functions and services performed by the Physical Layer are:
1.Establishment and termination of a connection to a communication medium.
2.Participation in the process whereby the communication resources are effectively shared among multiple users. For example, contention resolution and flow control.
3.Modulation, or conversion between the representation of digital data in user equipment and the corresponding signals transmitted over a communications channel. These are signals operating over the physical cabling (such as copper and optical fibers) or over a radio link.
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