Physical Layer (Layer 1)

The Physical Layer of the OSI model deals with the specifications that are used to interface the network with the devices and that include the combination of pins in connector, specified cables and voltages. After deal with them specifications its job is to transmits the bits to the medium, here we consider some of the Physical layer service as follow

   ·        Conversion of digital data into signals at sender side

   ·        Conversion of signals in to digital data at reviver side

Some of the protocol used at the physical layer

   ·        CSMA/CD (Carrier Sense Multiple Access/Collision Detection)

   ·        DSL (Digital Subscriber Line)

   ·        RS-232

   ·        Infrared Data Association

   ·        Bluetooth