Physical Layer Working of OSI Model || Networking Chapter IV OSI Model Part 2 ||

                                 OSI Model - Physical Layer

Summary - Today we will discuss about Physical Layer of OSI Model.

# Physical Layer - Physical Layer is the first layer at the receiving end and bottom layer of the sending end. Physical Layer receive data from upper layer and converts data into stream. Physical Layer Performing Following Task -

* Topology - In the Network how devices are connected with each other its define through the Topology.

* Transmission Rate - Physical Layer defines the transmission rate of data means how many bit transmitted per second. It means how long will the duration of bit.

* Transmission Mode - Physical Layer defines the transmission mode (Simplex, Half Duplex, Full Duplex) between two devices. Transmission Modes are - 

a) Simpex - Communication is done only in one direction means one device can only send data and other can only receive.

b) Half Duplex - In this types transmission Communication is done in both the direction but not at the same time. Example - Walkie Talkie.

c) Full Duplex - In this types transmission communication is done simultaneously in both the directions at the same time. Example - Mobile Calling.

* Encoding & Media - Before Transmission Physical Layer encodes the signal into electrical or optical from depending upon media and defines the types of the transmission media like copper wires or fibre optic cables.

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