Physical Layer

      The OSI model is a networking framework by implementing protocols in seven layers. The seven layers of the OSI layer are the: Physical (first layer), Data link (second layer), Network (third layer), Transport (fourth layer), Session (fifth layer), Presentation (sixth layer), Application (seventh layer). The top layer of OSI layer is the Application layer while the lowest level of the OSI layer is the Physical Layer.

      The Physical layer is the first layer of the OSI model. This layer has a mainly function of converting the bit streams. Physical layer is located below the Data Link Layer of the OSI Layer. This Physical layer has a role of transmitting bits all over the medium. Physical layer also provides a electrical , mechanical and procedural interface to a transmission medium.  Through physical layer, it also translates the logical communications from the Data Link Layer into hardware- by the means of sending and recieving data. Connector types, cable types, voltages and pin-outs are also defined as the Physical Layer.