Physical layer is responsible for putting bit on air and this physical layer of OSI model do the 802.11 standard vary. Physical layer is lower layer in the OSI model and it is responsible for sending bit from one computer to other computer. Physical layer deal with bit level transmission between different devices and supports electrical interface connected to physical medium for communication. Physical layer devices are repeaters, hubs, networks interface card (NICs), cables and connectors. There are seven layer and OSI model and each layer define their own task as this physical layer define the connection between two device or computer.