Physical Layer

Physical Layer:-The physical layer coordinates the functions required to carry a bit stream over a physical medium. It deals with the mechanical and electrical specifications of the interface and
transmission medium. It also defines the procedures and functions that physical devices and intertäces have to perturb tor transmission to Occur.
The physical layer is responsible for movements of
individual bits from one hop (node) to the next.
It's properties are:-
1.)Physical characteristics of interfaces and medium.:-The physical layer defines
the characteristics of the interface between the devices and the transmission
medium and type of transmission medium.
2.)Representation of bits.:-For transmission , bits must be encoded into signals—electrical or optical. The physical layer defines the type of encoding (how Os and 1s are changed to signals).
3.)Data rate. :-The transmission rate—the number of bits sent each second—is also
defined by the physical layer.
4.)Synchronization of bits:-the sender and
the receiver clocks must be synchronized.
5.)Line configuration.
6.)Physical topology:-how network are connected.
7.)Transmission mode:-It also define the direction of transmission.