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以太网(IEEE 802.3)概览

2015年3月10日 / 3,228次阅读

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IEEE 802.3简介

IEEE 802.3 is a working group and a collection of IEEE standards produced by the working group defining the physical layer and data link layer's media access control (MAC) of wired Ethernet. This is generally a local area network technology with some wide area network applications. Physical connections are made between nodes and/or infrastructure devices (hubs, switches, routers) by various types of copper or fiber cable. 802.3 is a technology that supports the IEEE 802.1 network architecture. 802.3 also defines LAN access method using CSMA/CD.

IEEE 802.3是一个工作组,也表示此工作组制定的一系列IEEE标准,这些标准都是物理层和数据链路层的有线以太网标准(802.11是WiFi)。一般情况下,以太网就是一个局域网络,带有广域网的一些功能应用。物理连接存在与节点之前,或者节点与网络设备之间,比如hub,switch,router,连接形式多种多样,有各种的铜线和光纤。802.3技术支持802.1网络,同时802.3也定义了局域网的连接机制是CSMA/CD







1 Experimental
1973 2.94 Mbit/s (367 kB/s) over coaxial cable (coax) bus,这是最早的实验以太网。
2 Ethernet II
(DIX v2.0)
1982 10 Mbit/s (1.25 MB/s) over thick coax. Frames have a Type field. This frame format is used on all forms of Ethernet by protocols in the Internet protocol suite。这个时候EthernetII报文格式基本确定。DIX Ethernet, named after DEC, Intel and Xerox。EthernetII帧结构
3 IEEE 802.3 standard 1983 10BASE5 10 Mbit/s (1.25 MB/s) over thick coax. Same as Ethernet II (above) except Type field is replaced by Length, and an 802.2 LLC header follows the 802.3 header. Based on the CSMA/CD Process。开始制定802.3系列标准。802.3,后面不带任何数字的,就是第一个标准。传输距离500m。
4 802.3a 1985 10BASE2 10 Mbit/s (1.25 MB/s) over thin Coax (a.k.a. thinnet or cheapernet)。传输距离185米。
5 802.3b 1985 10BROAD36.10 Mbit/s Ethernet signals over standard 75 ohm cable television (CATV) cable over a 3600 meter range。已经废弃的标准。
6 802.3c 1985 10 Mbit/s (1.25 MB/s) repeater spec。HUB的时代。
7 802.3d 1987 Fiber-optic inter-repeater link (FOIRL) is a specification of Ethernet over optical fibre. It was replaced by 10BASE-FL.
8 802.3e 1987 1BASE5 or StarLAN。StarLAN was the first implementation of 1 megabit per second (1Mbit/s) Ethernet over twisted pair wiring. It was standardized by the standards association of the Institute of Electrical and Electronics Engineers (IEEE) as 802.3e in 1987, as the 1BASE5 version of Ethernet. 这个时候开始使用双绞线传输以太网信号。
9 802.3i 1990 10BASE-T 10 Mbit/s (1.25 MB/s) over twisted pair.传输距离100米。
10 802.3j 1993 10BASE-F 10 Mbit/s (1.25 MB/s) over Fiber-Optic.
11 802.3u 1995 100BASE-TX, 100BASE-T4, 100BASE-FX Fast Ethernet at 100 Mbit/s (12.5 MB/s) w/o autonegotiation。进入快速以太网时代。
100base-T4 (twisted pair [4 pair])
100base-TX (twisted pair [2 pair])
100base-FX (fiber, 400m, MMF光纤)
12 802.3x 1997 Full Duplex and flow control; also incorporates DIX framing, so there's no longer a DIX/802.3 split。
13 802.3y 1998 100BASE-T2 100 Mbit/s (12.5 MB/s) over low quality twisted pair
14 802.3z 1998 1000BASE-X Gbit/s Ethernet over Fiber-Optic at 1 Gbit/s (125 MB/s)。那个时候用的光口应该是GBIC
15 802.3-1998 1998 A revision of base standard incorporating the above amendments and errata。1998年应该算是一个以太网发展的里程碑吧。
16 802.3ab 1999 1000BASE-T Gbit/s Ethernet over twisted pair at 1 Gbit/s (125 MB/s)。GE是先有光口的标准,后有电口的标准。传输距离还是100米。
17 802.3ac 1998 Max frame size extended to 1522 bytes (to allow "Q-tag") The Q-tag includes 802.1Q VLAN information and 802.1p priority information.VLAN出现。
18 802.3ad 2000 Link aggregation for parallel links, later moved to IEEE 802.1AX。链路聚合。Link aggregation addresses two problems with Ethernet connections: bandwidth limitations and lack of resilience.
19 802.3-2002 2002 A revision of base standard incorporating the three prior amendments and errata。
20 802.3ae 2002 10 Gigabit Ethernet over fiber; 10GBASE-SR, 10GBASE-LR, 10GBASE-ER, 10GBASE-SW, 10GBASE-LW, 10GBASE-EW。
SR:Short Range;
LR:Long Range;
ER:Extended Range;
21 802.3af 2003 Power over Ethernet,or PoE (15.4 W)
22 802.3ah 2004 Ethernet in the First Mile(EFM)。EPON uses a passive optical network.
23 802.3ak 2004 10GBASE-CX4 10 Gbit/s (1,250 MB/s) Ethernet over twinaxial cables
24 802.3-2005 2005 A revision of base standard incorporating the four prior amendments and errata.
25 802.3an 2006 10GBASE-T 10 Gbit/s (1,250 MB/s) Ethernet over unshielded twisted pair (UTP)
26 802.3ap 2007 Backplane Ethernet (1 and 10 Gbit/s (125 and 1,250 MB/s) over PCB--printed circuit boards)。
27 802.3aq 2006 10GBASE-LRM 10 Gbit/s (1,250 MB/s) Ethernet over multimode fiber
28 802.3as 2006 Frame expansion
29 802.3at 2009 Power over Ethernet enhancements (25.5 W)
30 802.3av 2009 10 Gbit/s EPON
31 802.3au 2006 Isolation requirements for Power over Ethernet (802.3-2005/Cor 1)
32 802.3aw 2007 Fixed an equation in the publication of 10GBASE-T (released as 802.3-2005/Cor 2)
33 802.3-2008 2008 A revision of base standard incorporating the 802.3an/ap/aq/as amendments, two corrigenda and errata. Link aggregation was moved to 802.1AX.
34 802.3az 2010 Energy Efficient Ethernet
35 802.3ba 2010 100 Gigabit Ethernet (100GbE) and 40 Gigabit Ethernet (40GbE) are groups of computer networking technologies for transmitting Ethernet frames at rates of 100 and 40 gigabits per second (100 and 40 Gbit/s), respectively. The technology was first defined by the IEEE 802.3ba-2010 standard.
Another variant, 802.3bg, was added in March 2011 to the set of standards. The task force 802.3bj is working on a four lane backplane and a copper 100 Gbit/s standard.
The 802.3bm task force is working on a standard for lower cost 100 Gbit/s optical physical interfaces.40G/100G Ethernet Background
36 802.3bb 2009 Increase Pause Reaction Delay timings which are insufficient for 10 Gbit/s
37 802.3bc 2009 Move and update Ethernet related TLVs (type, length, values), previously specified in Annex F of IEEE 802.1AB (LLDP) to 802.3
38 802.3bd 2010 Priority-based Flow Control. An amendment by the IEEE 802.1 Data Center Bridging Task Group (802.1Qbb) to develop an amendment to IEEE Std 802.3 to add a MAC Control Frame to support IEEE 802.1Qbb Priority-based Flow Control.
39 802.3.1 2011 MIB definitions for Ethernet. It consolidates the Ethernet related MIBs present in Annex 30A&B, various IETF RFCs, and 802.1AB annex F into one master document with a machine readable extract. (workgroup name was P802.3be)
40 802.3bf 2011 Provide an accurate indication of the transmission and reception initiation times of certain packets as required to support IEEE P802.1AS.
41 802.3bg 2011 Provide a 40 Gbit/s PMD which is optically compatible with existing carrier SMF 40 Gbit/s client interfaces (OTU3/STM-256/OC-768/40G POS).
42 802.3-2012 2012 A revision of base standard incorporating the 802.3at/av/az/ba/bc/bd/bf/bg amendments, a corrigenda and errata.
43 802.3bj 2014 Define a 4-lane 100 Gbit/s backplane PHY for operation over links consistent with copper traces on “improved FR-4” (as defined by IEEE P802.3ap or better materials to be defined by the Task Force) with lengths up to at least 1m and a 4-lane 100 Gbit/s PHY for operation over links consistent with copper twinaxial cables with lengths up to at least 5m.
44 802.3bk 2013 This amendment to IEEE Std 802.3 defines the physical layer specifications and management parameters for EPON operation on point-to-multipoint passive optical networks supporting extended power budget classes of PX30, PX40, PRX40, and PR40 PMDs.
45 802.3bm 2015 100G/40G Ethernet for optical fiber
46 802.3bp 2015 1000BASE-T1 - Gigabit Ethernet over a single twisted pair, automotive & industrial environments。802.3bp简介
47 802.3bq 40GBASE-T for 4-pair balanced twisted-pair cabling with 2 connectors over 30 m distances
48 802.3bs 400 Gbit/s Ethernet over optical fiber using multiple 25G/50G lanes
49 802.3bt Power over Ethernet enhancements up to 100W using all 4-pairs balanced twisted-pair cabling, lower standby power and specific enhancements to support IoT applications (e.g. Lighting, sensors, building automation).
50 802.3bw 100BASE-T1 - 100 Mbit/s Ethernet over a single twisted pair for automotive applications
51 802.3-2015 2015 802.3bx - a new consolidated revision of the 802.3 standard including amendments 802.2bk/bj/bm
52 802.3by 25G Ethernet.
25 Gigabit Ethernet (25GbE) and 50 Gigabit Ethernet (50GbE) are proposed standards for Ethernet connectivity in a datacenter environment. An industry consortium has been formed to promote the technology and IEEE 802 workgroup has formed to develop the standard. The draft uses technology defined for 100 Gigabit Ethernet implemented as four 25-Gbit/s lanes (IEEE 802.3bj).
IEEE 802.3 has formed an 802.3by task force with the objectives to define:
a single-lane 25 Gbit/s 25GBASE-KR PHY for printed circuit backplanes;
a single-lane 25 Gbit/s 25GBASE-CR PHY for 5 m twin-ax cables;
a single-lane 25 Gbit/s PHY for multi-mode optical fiber.


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