EE 281 Lecture 5: Physical link layer
Document Summary
The main function of the linkk layer is adding the header and trailer to the packet which comes from the network layer, this layer also performs the error checking and correction, Data in this layer is called as frames. In the frames various types of methods are implemented for the data transfer, e. g bit stream or byte stream, discussed later. Media for data transfer: unshielded twisted pair cable, coaxial cable wires. These ism (industrial, scientific and medical radio band), wifi is considered under these bands. More crest and troughs means more bandwidth, more data. B is best among these for data transfer, Possible services that can be offered by a link-layer protocol include: framing. Almost all link-layer protocols encapsulate each network-layer datagram within a link-layer frame before transmission over the link. A frame consists of a data field, in which the network-layer datagram is inserted, and a number of header fields.
