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IEEE 802.3bm是IEEE标准协会（Institute of Electrical and Electronics Engineers）针对以太网（Ethernet）制定的一项标准。该标准是对2012年版IEEE 802.3标准的修订与补充，特别针对40Gb/s和100Gb/s的高速以太网物理层规范和光纤电缆运行的管理参数进行了标准化。首先需要了解的是，IEEE 802.3bm标准的全名为“Amendment to IEEE Std 802.3-2012 for Physical Layer Specifications and Management Parameters for 40 Gb/s and 100 Gb/s Operation Over Fiber Optic Cables”。这个修订版（Amendment X）是由计算机协会的局域网/城域网标准委员会（LAN/MAN Standards Committee）负责准备的。 IEEE 802.3bm标准解决了两个主要的技术问题。一是它为40千兆位/秒（40Gb/s）的以太网数据传输提供了单模光纤（40GBASE-ER4）上的物理层（PHY）规范。二是它为100千兆位/秒（100Gb/s）的以太网数据传输提供了多模光纤（100GBASE-SR4）上的物理层规范。这些标准的制定是随着计算机网络技术的不断进步和互联网流量的持续增长，为了满足数据中心、企业和高带宽网络服务提供商之间对高速数据传输的需求。在详细知识中，有必要对IEEE 802.3bm标准中的关键组件进行说明： 1. 40GBASE-ER4：这一术语指定了一个特定的40Gb/s以太网接口，它允许数据在单模光纤上进行远距离传输。ER4后缀中的"E"代表“Extended”，即扩展范围，而"R4"表明这是一种使用四条光纤通道进行数据传输的技术。在802.3bm标准中，该接口被定义为可以在单模光纤上进行至少40公里距离的数据传输。 2. 100GBASE-SR4：这个接口标准涉及100Gb/s的以太网操作，并使用多模光纤进行短距离通信。SR4指的是短距离（Short Range），并且同样是利用四条光纤通道实现。802.3bm标准定义了这一接口可以在多模光纤上实现至少100米或更长距离的数据传输。 3. CAUI-4（100Gigabit Attachment Unit Interface）：这是一种物理接口，用于连接100Gb/s的以太网设备。CAUI-4是一种四通道接口，允许数据在相关设备间以100Gb/s的速率传输。在802.3bm标准中，CAUI-4被指定为100GbE设备的主要物理层接口。 4. EEE（Energy Efficient Ethernet）：EEE是可选的标准特性，其目的是优化以太网设备在低负载时的能效。EEE工作时，当网络流量较小时，可以降低设备的能量消耗，从而节省电能，这在大型数据中心和企业网络环境中具有重要意义。这些知识点的总结是基于文件提供的信息，注意IEEE 802.3bm标准作为文档记录的一部分，可能随着时间的推移而发生改变。因此，对于那些寻求实施这些规范的人来说，重要的是要参考最新的标准文档。IEEE 802.3bm标准的草案（D1.1版）已准备接受任务组的审查，且该草案会在发布日期后六个月内或者当下一版标准发布时失效，以先到者为准。需要注意的是，这是一个未经批准的草案，所以可能会有所改变，使用该草案文档的风险应由用户自己承担。此外，该文档是未被批准的，因此不能用于任何符合性/合规性目的。只有在IEEE标准协会标准部（stds.***）获得授权的情况下，IEEE标准委员会的参与者才可将其用于国际标准化的考虑。在该文档被其他标准开发组织采纳之前，也必须获得IEEE标准协会标准部的许可。任何寻求复制该文档全部或部分内容的其他实体也必须获得IEEE标准协会标准部的许可。

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IEEE P802.3bm

™

/D1.1, 2nd August 2013

(Amendment of IEEE Std 802.3™-2012)

IEEE P802.3bm™/D1.1

Draft Standard for Ethernet

Amendment X:

Physical Layer Specifications and

Management Parameters for 40 Gb/s and

100 Gb/s Operation Over Fiber Optic

Cables

Prepared by the

LAN/MAN Standards Committee

of the

IEEE Computer Society

This draft is an amendment of IEEE Std 802.3-2012. This amendment adds Physical Layer (PHY)

specifications and management parameters for 40 Gb/s operation over single-mode fiber (40GBASE-ER4)

and for 100 Gb/s operation over multimode fiber (100GBASE-SR4). This amendment also specifies a four-

lane variant of the 100 Gigabit Attachment Unit Interface (CAUI-4) and optional Energy Efficient Ethernet

(EEE) for 40 Gb/s and 100 Gb/s operation over fiber optic cables. Draft D1.1 is prepared for Task Force

review. This draft expires 6 months after the date of publication or when the next version is published,

whichever comes first.

Three Park Avenue

New York, New York 10016-5997, USA

This document is an unapproved draft of a proposed IEEE Standard. As such, this document is subject to

change. USE AT YOUR OWN RISK! Because this is an unapproved draft, this document must not be

utilized for any conformance/compliance purposes. Permission is hereby granted for IEEE Standards

Committee participants to reproduce this document for purposes of international standardization

consideration. Prior to adoption of this document, in whole or in part, by another standards development

organization, permission must first be obtained from the IEEE Standards Association Department

(stds.ipr@ieee.org). Other entities seeking permission to reproduce this document, in whole or in part, must

also obtain permission from the IEEE Standards Association Department.

IEEE Standards Association Department

445 Hoes Lane

Piscataway, NJ 08854, USA

Draft Amendment to IEEE Std 802.3-2012 IEEE Draft P802.3bm/D1.1

IEEE P802.3bm 40 Gb/s and 100 Gb/s Fiber Optic Task Force 2nd August 2013

This is an unapproved IEEE Standards draft, subject to change.

Introduction

IEEE Std 802.3™ was first published in 1985. Since the initial publication, many projects have added func-

tionality or provided maintenance updates to the specifications and text included in the standard. Each IEEE

802.3 project/amendment is identified with a suffix (e.g., IEEE Std 802.3bm™-201x).

The Media Access Control (MAC) protocol specified in IEEE Std 802.3 is Carrier Sense Multiple Access

with Collision Detection (CSMA/CD). This MAC protocol was included in the experimental Ethernet devel-

oped at Xerox Palo Alto Research Center. While the experimental Ethernet had a 2.94 Mb/s data rate,

IEEE Std 802.3-1985 specified operation at 10 Mb/s. Since 1985 new media options, new speeds of opera-

tion, and new capabilities have been added to IEEE Std 802.3.

Some of the major additions to IEEE Std 802.3 are identified in the marketplace with their project number.

This is most common for projects adding higher speeds of operation or new protocols. For example, IEEE

Std 802.3u™ added 100 Mb/s operation (also called Fast Ethernet), IEEE Std 802.3x specified full duplex

operation and a flow control protocol, IEEE Std 802.3z added 1000 Mb/s operation (also called Gigabit

Ethernet), IEEE Std 802.3ae added 10 Gb/s operation (also called 10 Gigabit Ethernet), IEEE Std 802.3ah™

specified access network Ethernet (also called Ethernet in the First Mile) and IEEE Std 802.3ba added 40

Gb/s operation (also called 40 Gigabit Ethernet) and 100 Gb/s operation (also called 100 Gigabit Ethernet).

These major additions are all now included in and are superseded by IEEE Std 802.3-2012 and are not main-

tained as separate documents.

At the date of IEEE Std 802.3bm-201x publication, IEEE Std 802.3 is comprised of the following

documents:

IEEE Std 802.3-2012

Section One—Includes Clause 1 through Clause 20 and Annex A through Annex H and Annex 4A.

Section One includes the specifications for 10 Mb/s operation and the MAC, frame formats and service

interfaces used for all speeds of operation.

Section Two—Includes Clause 21 through Clause 33 and Annex 22A through Annex 33E. Section

Two includes management attributes for multiple protocols and speed of operation as well as specifica-

tions for providing power over twisted pair cabling for multiple operational speeds. It also includes

general information on 100 Mb/s operation as well as most of the 100 Mb/s Physical Layer specifica-

tions.

Section Three—Includes Clause 34 through Clause 43 and Annex 36A through Annex 43C. Section

Three includes general information on 1000 Mb/s operation as well as most of the 1000 Mb/s Physical

Layer specifications.

Editor’s Note (to be removed prior to publication):

This front matter is provided for comment only. Front matter is not part of a published standard and is

therefore, not part of the draft standard. You are invited to review and comment on it as it will be included

in the published standard after approval.

One exception to IEEE style that is consciously used to simplify the balloting process is the numbering of

the front matter. Instead of the front matter being lower case Roman numeral page numbers, with the draft

restarting at 1 with arabic page numbers, balloted front matter and draft are numbered consecutively with

arabic page numbers.

This introduction is not part of IEEE P802.3bm, IEEE Draft Standard for Ethernet. Amendment: Physical

Layer Specifications and Management Parameters for 40 Gb/s and 100 Gb/s Operation Over Fiber Optic

Cables.

Draft Amendment to IEEE Std 802.3-2012 IEEE Draft P802.3bm/D1.1

IEEE P802.3bm 40 Gb/s and 100 Gb/s Fiber Optic Task Force 2nd August 2013

This is an unapproved IEEE Standards draft, subject to change.

Section Four—Includes Clause 44 through Clause 55 and Annex 44A through Annex 55B. Section

Four includes general information on 10 Gb/s operation as well as most of the 10 Gb/s Physical Layer

specifications.

Section Five—Includes Clause 56 through Clause 77 and Annex 57A through Annex 76A. Clause 56

through Clause 67 and Clause 75 through Clause 77, as well as associated annexes, specify subscriber

access and other Physical Layers and sublayers for operation from 512 kb/s to 10 Gb/s, and defines ser-

vices and protocol elements that enable the exchange of IEEE Std 802.3 format frames between sta-

tions in a subscriber access network. Clause 68 specifies a 10 Gb/s Physical Layer specification.

Clause 69 through Clause 74 and associated annexes specify Ethernet operation over electrical back-

planes at speeds of 1000 Mb/s and 10 Gb/s.

Section Six—Includes Clause 78 through Clause 90 and Annex 83A through Annex 86A. Clause 78

specifies Energy-Efficient Ethernet. Clause 79 specifies IEEE 802.3 Organizationally Specific Link

Layer Discovery Protocol (LLDP) type, length, and value (TLV) information elements. Clause 80

through Clause 89 and associated annexes includes general information on 40 Gb/s and 100 Gb/s oper-

ation as well the 40 Gb/s and 100 Gb/s Physical Layer specifications. Clause 90 specifies Ethernet sup-

port for time synchronization protocols.

IEEE Std 802.3bj™-201x

This amendment includes changes to IEEE Std 802.3-2012 and adds Clause 91 through Clause 94 as

well as associated annexes. This amendment adds 100 Gb/s Physical Layer (PHY) specifications and

management parameters for operation on electrical backplanes and twinaxial copper cables. This

amendment also specifies optional Energy Efficient Ethernet (EEE) for 40 Gb/s and 100 Gb/s operation

over electrical backplanes and copper cables.

IEEE Std 802.3bk™-201x

This amendment includes changes to EPON as defined in IEEE Std 802.3-2012 and adds the physical

layer specifications and management parameters for EPON operation on point-to-multipoint passive

optical networks supporting extended power budget classes of PX30 (29 dB for 1G-EPON), PX40

(33 dB for 1G-EPON), PRX40 (33 dB for 10/1G-EPON), and PR40 (33 dB for 10/10G-EPON).

IEEE Std 802.3bm™-201x

This amendment includes changes to IEEE Std 802.3-2012 and adds Clause 95 as well as associated

annexes. This amendment adds Physical Layer (PHY) specifications and management parameters for

40 Gb/s operation over single-mode fiber (40GBASE-ER4) and for 100 Gb/s operation over multimode

fiber (100GBASE-SR4). This amendment also specifies a four-lane variant of the 100 Gigabit Attach-

ment Unit Interface (CAUI-4) and optional Energy Efficient Ethernet (EEE) for 40 Gb/s and 100 Gb/s

operation over fiber optic cables.

A companion document IEEE Std 802.3.1 describes Ethernet management information base (MIB) modules

for use with the Simple Network Management Protocol (SNMP). IEEE Std 802.3.1 is updated to add man-

agement capability for enhancements to IEEE Std 802.3 after approval of the enhancements.

IEEE Std 802.3 will continue to evolve. New Ethernet capabilities are anticipated to be added within the

next few years as amendments to this standard.

Notice to users

Draft Amendment to IEEE Std 802.3-2012 IEEE Draft P802.3bm/D1.1

IEEE P802.3bm 40 Gb/s and 100 Gb/s Fiber Optic Task Force 2nd August 2013

This is an unapproved IEEE Standards draft, subject to change.

Laws and regulations

Users of these documents should consult all applicable laws and regulations. Compliance with the

provisions of this standard does not imply compliance to any applicable regulatory requirements.

Implementors of the standard are responsible for observing or referring to the applicable regulatory

requirements. IEEE does not, by the publication of its standards, intend to urge action that is not in

compliance with applicable laws, and these documents may not be construed as doing so.

Copyrights

This document is copyrighted by the IEEE. It is made available for a wide variety of both public and private

uses. These include both use, by reference, in laws and regulations, and use in private self-regulation,

standardization, and the promotion of engineering practices and methods. By making this document

available for use and adoption by public authorities and private users, the IEEE does not waive any rights in

Updating of IEEE documents

Users of IEEE standards should be aware that these documents may be superseded at any time by the

issuance of new editions or may be amended from time to time through the issuance of amendments,

corrigenda, or errata. An official IEEE document at any point in time consists of the current edition of the

document together with any amendments, corrigenda, or errata then in effect. In order to determine whether

a given document is the current edition and whether it has been amended through the issuance

of amendments, corrigenda, or errata, visit the IEEE Standards Association website at

http://ieeexplore.ieee.org/xpl/standards.jsp

, or contact the IEEE at the address listed previously.

For more information about the IEEE Standards Association or the IEEE standards development process,

visit the IEEE-SA website at http://standards.ieee.org

Errata

Errata, if any, for this and all other standards can be accessed at the following URL:

http://standards.ieee.org/findstds/errata/index.html

. Users are encouraged to check this URL for errata

periodically.

Patents

Attention is called to the possibility that implementation of this standard may require use of subject matter

covered by patent rights. By publication of this standard, no position is taken by the IEEE with respect to the

existence or validity of any patent rights in connection therewith. If a patent holder or patent applicant has

filed a statement of assurance via an Accepted Letter of Assurance, then the statement is listed on the

IEEE-SA website

. Letters of Assurance may indicate whether the Submitter is willing or unwilling to grant

licenses under patent rights without compensation or under reasonable rates, with reasonable terms and

conditions that are demonstrably free of any unfair discrimination to applicants desiring to obtain such

licenses.

Essential Patent Claims may exist for which a Letter of Assurance has not been received. The IEEE is not

responsible for identifying Essential Patent Claims for which a license may be required, for conducting

inquiries into the legal validity or scope of Patents Claims, or determining whether any licensing terms or

conditions provided in connection with submission of a Letter of Assurance, if any, or in any licensing

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