IEEE 802

IEEE 802 is a project of the Institute of Electrical and Electronics Engineers (better known by its initials, IEEE). It is also identified with the acronym LMSC (LAN / MAN Standards Committee). Its mission is to develop standards for local area networks (LAN) and metropolitan area networks (MAN), mainly in the lower two layers of the OSI model. [1]

IEEE 802 was a project created in February 1980 in parallel with the design of the OSI Model. It was developed in order to create standards so that different types of technologies could be integrated and work together. Project 802 defines aspects related to physical cabling and data transmission.

IEEE that acts on computer networks. Specifically and according to its own definition of local area networks (RAL, in English LAN) and metropolitan area networks (MAN in English). The IEEE 802 name is also used to refer to the proposed standards, some of which are well known: Ethernet (IEEE 802.3), or Wi-Fi (IEEE 802.11). It is even trying to standardize Bluetooth in 802.15 (IEEE 802.15).

It focuses on defining the lowest levels (according to the OSI reference model or any other model). Specifically subdivides the second level, the liaison, into two sub-levels: the Logical Link (LLC), collected in 802.2, and the Medium Access Control (MAC), sublayer of the Logical Link layer. The rest of the standards act both in the Physical Level, as in the sub-level of Control of Access to the Environment.

In February of 1980 a committee of local networks was formed in the IEEE with the intention of standardizing a system of 1 or 2 Mbps that basically was Ethernet (the one of the time). They decided to standardize the physical, liaison and superior levels. They divided the link level into two sub-levels: the logical link, in charge of the logic of re-dispatches, flow control and error checking, and the sub-level of access to the environment, in charge of arbitrating conflicts of simultaneous access to the network by the stations.

By the end of the year, the standard had already been extended to include the Token Ring (control ring ring) of IBM and one year later, and due to pressures from industrial groups, Token Bus was included (bus network with witness passing ), which included real-time and redundancy options, and which was assumed to be suitable for factory environments.

Each of these three “standards” had a different physical level, a different access level sub-level but with some common feature (address space and error checking), and a single logical link level for all of them.

Afterwards, work camps were expanded, including metropolitan area networks (some ten kilometers), personnel (a few meters) and regional networks (some hundred kilometers), wireless networks (WLAN), security methods, comfort were included. , etc.

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