Ethernet Analysis

Ethernet is the most common communication protocol standard adopted by the existing LAN. This standard defines the cable types and signal processing methods used in local area network (LAN). Ethernet transmits packets between interconnected devices at the rate of 10 ~ 100Mbps. Twisted pair cable 10 base t Ethernet has become the most widely used Ethernet technology because of its low cost, high reliability and 10Mbps rate. The direct expansion wireless Ethernet can reach 11Mbps. The products provided by many manufacturing suppliers can use general software protocol for communication, with the best openness.

Ethernet is a networking technology of computer LAN. IEEE 802.3 standard formulated by IEEE gives the technical standard of Ethernet. It specifies the contents of the connection, electrical signal and media access layer protocol including the physical layer. Ethernet is the most widely used LAN technology. It largely replaces other LAN standards, such as token ring, FDDI and ARCNET.  

The standard topology of Ethernet is bus topology, but the current fast Ethernet (100Base-T and 1000BASE-T standards) uses switch hub to connect and organize the network in order to minimize conflicts and improve network speed and efficiency. In this way, the topology of Ethernet becomes star, but logically, Ethernet still uses bus topology and bus contention technology of CSMA / CD (Carrier Sense Multiple Access / Collision Detect).  

Ethernet is based on the idea that multiple nodes of the radio system on the network send information. Each node must obtain the of cable or channel to transmit information, which is sometimes called ether. (the name comes from the 19th century physicist's assumption of the electromagnetic radiation medium - light ether. Later research proved that light ether does not exist.) Each node has a unique 48 bit address in the world, that is, the MAC address assigned by the manufacturer to the network card, so as to ensure that all systems on the Ethernet can identify each other. [3] because Ethernet is very common, many manufacturers integrate Ethernet cards directly into the computer motherboard. It has been found that Ethernet communication has the characteristics of autocorrelation, which is very important for Telecom Communication Engineering.