IEEE 802 Standard for Networks

The IEEE 802 committee has developed and published standards for Local Area Networks (LAN) and Metropolitan Area Networks (MAN) adopted in the worldwide even by ISO (International Organization for Standardization).

Relationship between OSI Reference Model and IEEE 802

Logical Link Control (LLC)

LLC specifies mechanisms for addressing stations connected to the medium and for controlling data transfer between network users. This standard is based on the HDLC protocol. It establishes 3 types of services: 1) unacknowledged connectionless-mode, 2) connection-mode and 3) acknowledged connectionless-mode.

The LLC layer is common to all IEEE 802 networks.

Medium Access Control (MAC) and Physical layer.

MAC layer allows various devices to share network transmission capacity. It controls the access to the transmission medium in order to provide an orderly and efficient use of this medium.

IEEE 802 presents several MAC options, associated to various physical mediums.

* Twisted pair

CSMA/CD

Carrier-sense Multiple Access with Collision Detection.

In the CSMA/CD the first station checks if there is anybody transmitting in the medium and transmit only if the medium is free. In case of collision the station stops the transmission.

CSMA/CD is the MAC used by more than 90% of the networks (LAN's and MAN's). These networks are also known as Ethernet.

IEEE 802

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IEEE 802 LAN/MAN Standards Committee

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IEEE 802 standards are presented below.