05/06/06

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

OSI layers
7	Application
6	Presentation
5	Session
4	Transport
3	Network		IEEE 802 layers
			Logical Link Control - LLC
2	Data Link
			Medium Access Control (MAC)
1	Physical
			Physical

 

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.

 

	802.3	802.4	802.5	802.6	802.11	802.12	802.16
MAC	CSMA/CD ethernet	Token bus	Token ring	DQDB	CSMA (WLAN)	Priority	WLAN
Physical	Coaxial Wire* Fiber	Coaxial Fiber	Wire*	Fiber	Wireless	Wire*	Wireless

* 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.

 

Wireless Nets

 

The IEEE 802 committee have the following active groups working on the elaboration of wireless nets rules:

 

802.11	Wireless LAN (WLAN)	WIFI
802.15	Wireless Personal Area Network (WPAN)	Bluetooth entre outros.
802.16	Broadband Wireless Access (BBWA)	WiMax
802.20	Mobile Wireless Access	Mobile-Fi

 

 

IEEE 802

 

For an updating on the IEEE 802 standard click on:

 

IEEE 802 LAN/MAN Standards Committee

 

For a free download of IEEE 802 standards click on:

 

Get IEEE 802™

 

IEEE 802 standards are presented below.

 

802	Overview and Architecture.
802.1B 802.1K	LAN/MAN Management.
802.1D	Media Access Control (MAC) Bridges.
802.1E	System Load Protocol.
802.1F	Common Definitions and Procedures for IEEE 802 Management Information.
802.1G	Remote Media Access Control (MAC) Bridging.
802.1H	Recommended Practice for Media Access Control (MAC) Bridging of Ethernet V2.0 in IEEE 802 Local Area Networks.
802.1Q	Virtual Bridged Local Area Networks.
802.2	Logical Link Control.
802.3	CSMA/CD Access Method and Physical Layer Specifications.
802.4	Token Bus Access Method and Physical Layer Specifications.
802.5	Token Ring Access Method and Physical Layer Specifications.
802.6	Distributed Queue Dual Bus Access Method and Physical Layer Specifications.
802.10	Interoperable LAN/MAN Security.
802.11	Wireless LAN Medium Access Control (MAC) Sub layer and Physical Layer Specifications.
802.12	Demand Priority Access Method, Physical Layer and Repeater Specification.
802.15	Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for: Wireless Personal Area Networks.
802.16	Standard Air Interface for Fixed Broadband Wireless Access Systems.
802.17	Resilient Packet Ring Access Method and Physical Layer Specifications.

 

 

 

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