IEEE_802系列标准

IEEE 802系列标准

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IEEE 802 refers to a family of IEEE standards dealing with local area networks and metropolitan area networks.

More specifically, the IEEE 802 standards are restricted to networks carrying variable-size packets. (By contrast, in cell-based networks data is transmitted in short, uniformly sized units called cells. Isochronous networks, where data is transmitted as a steady stream of octets, or groups of octets, at regular time intervals, are also out of the scope of this standard.) The number 802 was simply the next free number IEEE could assign, though “802” is sometimes associated with the date the first meeting was held — February 1980.

The services and protocols specified in IEEE 802 map to the lower two layers (Data Link and Physical) of the seven-layer OSI networking reference model. In fact, IEEE 802 splits the OSI Data Link Layer into two sub-layers named Logical Link Control(LLC) and Media Access Control (MAC) , so that the layers can be listed like this:

∙Data link layer

o LLC Sublayer

o MAC Sublayer

∙Physical layer

The IEEE 802 family of standards is maintained by the IEEE 802 LAN/MAN Standards Committee (LMSC). The most widely used standards are for the Ethernet family, Token Ring, Wireless LAN, Bridging and Virtual Bridged LANs. An individual Working Group provides the focus for each area.

Contents

[hide]

∙ 1 Working groups

∙ 2 See also

∙ 3 References

∙ 4 External links

[edit] Working groups

name description note

IEEE 802.1Bridging (networking) and Network Management

IEEE 802.2Logical link control inactive IEEE 802.3Ethernet

IEEE 802.4Token bus disbanded IEEE 802.5Defines the MAC layer for a Token Ring inactive IEEE 802.6Metropolitan Area Networks disbanded IEEE 802.7Broadband LAN using Coaxial Cable disbanded IEEE 802.8Fiber Optic TAG disbanded IEEE 802.9Integrated Services LAN disbanded IEEE 802.10Interoperable LAN Security disbanded

IEEE 802.11 a/b/g/n Wireless LAN (WLAN) & Mesh (Wi-Fi certification)

IEEE 802.12demand priority disbanded IEEE 802.13Used for 100BASE-X Ethernet

IEEE 802.14Cable modems disbanded IEEE 802.15Wireless PAN

IEEE 802.15.1Bluetooth certification

IEEE 802.15.2IEEE 802.15 and IEEE 802.11 coexistence

IEEE 802.15.3High-Rate WPAN certification

IEEE 802.15.4Low-rate WPAN certification

IEEE 802.15.5Mesh networking for WPAN

IEEE 802.16Broadband Wireless Access (WiMAX certification)

IEEE 802.16e(Mobile) Broadband Wireless Access IEEE 802.16.1 Local Multipoint Distribution Service IEEE 802.17Resilient packet ring

IEEE 802.18Radio Regulatory TAG

IEEE 802.19Coexistence TAG

IEEE 802.20Mobile Broadband Wireless Access IEEE 802.21Media Independent Handoff

IEEE 802.22Wireless Regional Area Network

IEEE 802.23Emergency Services Working Group New (March, 2010)

对于不同传输介质的不同局域网，IEEE局域网标准委员会定制了不同的标准，适用于不同的网络环境，IEEE 802各标准之间的关系如图4-2所示。

IEEE 802标准主要包括几项（这些标准在物理层和MAC子层有区别，但在逻辑链路子层是兼容的）：