Physical Layer

Physical Layer:

It is the bottom layer of OSI Model. It transmits stream of bits and defines how the data is transmitted over the network and what control signals are used. Its main function is to control how a stream of bits is sent and received over the physical medium. The following function performed by the physical layer.

1. Characteristics of Media: It layer define the characteristics and type of transmission medium.
2. Transmission Mode: The physical layer defines the direction of transmission between two devices simplex, half duplex or full duplex.
3. Data Rate: It define the number of bit that will be sent in each second.