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What is Ethernet? What is the difference between Ethernet and IEEE802.3

Source: Shangpin China | Type: website encyclopedia | Time: June 28, 2014
Ethernet is a baseband LAN specification created by Xerox and jointly developed by Xerox, Intel and DEC. Ethernet standard and IEEE 802 Series 3 standards are similar. They are the most common communication protocol standards used by existing LAN, and also the most important LAN networking technology today. Therefore, understanding Ethernet and Ethernet transmission control mechanism is to understand network applications Website Design Basic knowledge necessary for technology. Generally speaking, Ethernet technology mainly refers to the following three LAN technologies.

(1) Traditional Ethernet/IEEE 802 3 - Coaxial cable or twisted pair is used as the network medium, and the transmission rate reaches 10Mbps,
(2) Fast Ethernet, using twisted pair as the network medium, with a transmission rate of 100Mbps,
(3) Gigabit Ethernet, using optical cable or twisted pair as network media, with transmission rate up to 1000Mbps (1Gbps)

Development of Ethernet

Today's dominant LAN technology Ethernet not only drives the network applications of major enterprises and departments, but also plays an important role in promoting the development of computer technology and the rapid popularization of Internet applications. Its development history is as follows:

In 1973, Robert Metcalfe put forward the idea of Ethernet communication in his doctoral thesis at Harvard University
In 1975, the idea of Ethernet communication was successfully tested in the research center of Xerox Company in the United States.
In 1980, Xerox, Inte1 and DEC jointly proposed the Ethernet specification.
1982, IEEE 802 3 The lOBase-5 standard came out.
In 1989, ISO adopted the standard number ISO 8802 3 Adopted IEEE 802 3 Standards.

Since the introduction of the 1OBase-5 standard in 1982, Ethernet has constantly introduced new technologies, forming IEEE 802 The Ethernet standard series has become the most successful standard among the IEEE 802 standards. In the past decade, the transmission rate of Ethernet has developed from 10Mbps to 100Mbps, 1000Mbps and lOGMbps today.

As a standard, 802.3 makes Ethernet develop more normatively. At the same time, Ethernet standards are constantly defined in IEEE 802 3. Today, Ethernet is still the mainstream technology for building local area networks.

Ethernet and IEEE 802.3

In practical applications, we often use Ethernet and IEEE 802 3 The boundary between these two concepts is blurred because Ethernet has two standards.

(1) DIX Ethernet V2 standard: It is the specification of the first LAN product (Ethernet) in the world
(2) IEEE 802.3 standard.

The DIX Ethernet V2 standard is slightly different from the IEEE 802.3 standard. Therefore, IEEE 802 3 LAN is called "Ethernet" for short. Strictly speaking, "Ethernet" should refer to the LAN conforming to the DIX Ethernet V2 standard.

With the introduction and application of Ethernet switching technology, fast Ethernet (100Base-T) and other technologies, the word "Ethernet" is now more used to refer to all kinds of LANs adopting CSMA/CD technology

Ethernet and IEEE 802 3 The similarities are as follows:

Based on the broadcast mechanism, the two work in the same principle, and both use CSMA/CD random access competition technology.

Ethernet and IEEE 802 The main differences of 3 are as follows:

The services provided by Ethernet mainly correspond to the first and second layers of the OSI reference model, namely the physical layer and the data link layer; IEEE 802 3. It mainly specifies the media access part of the physical layer and the data link layer, that is, IEEE 802 3 Through the media access control layer, a variety of different physical layers are specified, including not only bus type, but also token ring and other different types; Ethernet only provides one physical layer protocol.
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