In 1985, the Computer society of the IEEE started a project, called Project 802, to set standards to enable intercommunication between equipment from a variety of manufactures. Project 802 does not seek to replace any part of the OSI model. Instead, it is a way of specifying functions of the physical layer and the data link layer of major LAN protocols. The standard was adopted by the American National Standard Institution (ANSI). In 1987, the International Standard Organization (ISO) also approved it as international standard under the designation ISO 8802.
The IEEE has subdivided the data link layer into two sublayers: logical link control (LLC) and media access control (MAC). The physical layer is also divided into two sublayers: physical medium independent (PMI) sublayer and physical medium dependent (PMD) sublayer.
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