400G多模光纤标准IEEE 802.3cm-2020：物理层与管理参数详解

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IEEE 802.3cm-2020标准是IEEE对以太网标准的第7个修订版，主要关注400Gbps数据传输速率在多模光纤（MMF）上的物理层和管理参数。这个标准是在IEEE 802.3™-2018标准的基础上进行一系列后续修正，包括IEEE 802.3cb™-2018、IEEE 802.3bt™-2018、IEEE 802.3cd™-2018、IEEE 802.3cn™-2019、IEEE 802.3cg™-2019和IEEE 802.3cq™-2020。它由IEEE计算机协会的局域网/城域网标准委员会负责制定，并于2020年1月30日获得批准，由IEEE标准委员会授权许可。该标准的目标是确保400Gbps的高速数据传输能够在现有的多模光纤基础设施中高效运行，同时考虑到信号完整性、带宽利用率、兼容性和电源管理等因素。随着数据中心和云计算的发展，对高带宽的需求日益增长，IEEE 802.3cm-2020旨在满足这一需求，可能包括新的传输技术、编码方案、波长划分策略以及优化的多通道连接方法。物理层方面，标准可能涵盖了信号调制方式、码型、频率和功率谱密度规范，以及如何保证在多模光纤中的信号质量和距离覆盖。管理参数部分则可能涉及到网络管理协议的扩展，如链路检测、流量控制、错误报告机制以及与更高级别的网络协议的交互。此外，由于文档强调了“限制使用”并注明了下载日期和来源，可以推断该标准可能涉及知识产权保护措施，确保只有获得授权的用户才能访问其完整内容。对于实际应用，开发者和实施者需要遵循这些规定，确保符合版权要求并遵循标准化过程，以避免潜在的法律问题。 IEEE 802.3cm-2020是当前高速以太网技术的重要里程碑，它不仅定义了400Gbps通信在多模光纤上的基础，还为未来的网络架构提供了关键的规范支持。对于那些在数据中心、云计算、5G回传等领域工作的人来说，理解和遵循这个标准至关重要，以推动网络性能的提升和技术创新。

IEEE Std 802.3cn™-2019

Amendment 4—This amendment includes changes to IEEE Std 802.3-2018 and adds 50 Gb/s,

200 Gb/s, and 400 Gb/s Physical Layer specifications and management parameters for operation over

single-mode fiber with reaches of at least 40 km.

IEEE Std 802.3cg™-2019

Amendment 5—This amendment includes changes to IEEE Std 802.3-2018 and its amendments, and

adds Clause 146 through Clause 148 and Annex 146A and Annex 146B. This amendment adds

10 Mb/s Physical Layer specifications and management parameters for operation on a single balanced

pair of conductors.

IEEE Std 802.3cq™-2020

Amendment 6—This amendment includes editorial and technical corrections, refinements, and

clarifications to Clause 33 and related portions of the standard.

IEEE Std 802.3cm™-2020

Amendment 7—This amendment includes changes to IEEE Std 802.3-2018 and adds Clause 150. This

amendment adds Physical Layer (PHY) specifications and management parameters for 400 Gb/s

operation on four pairs (400GBASE-SR4.2) and eight pairs (400GBASE-SR8) of multimode fiber,

over reaches of at least 100 m.

Two companion documents exist, IEEE Std 802.3.1 and IEEE Std 802.3.2. IEEE Std 802.3.1 describes

Ethernet management information base (MIB) modules for use with the Simple Network Management

Protocol (SNMP). IEEE Std 802.3.2 describes YANG data models for Ethernet. IEEE Std 802.3.1 and IEEE

Std 802.3.2 are updated to add management capability for enhancements to IEEE Std 802.3 after approval of

those 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.

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IEEE Std 802.3cm-2020

IEEE Standard for Ethernet—Amendment 7:

Physical Layer and Management Parameters for 400 Gb/s over Multimode Fiber

Contents

1. Introduction........................................................................................................................................... 17

1.3 Normative references.................................................................................................................. 17

1.4 Definitions .................................................................................................................................. 17

30. Management.......................................................................................................................................... 18

30.5 Layer management for medium attachment units (MAUs) ........................................................ 18

30.5.1 MAU managed object class .............................................................................................. 18

30.5.1.1 MAU attributes ....................................................................................................... 18

30.5.1.1.2 aMAUType ................................................................................................... 18

45. Management Data Input/Output (MDIO) Interface.............................................................................. 19

45.2 MDIO Interface Registers........................................................................................................... 19

45.2.1 PMA/PMD registers ......................................................................................................... 19

45.2.1.6 PMA/PMD control 2 register (Register 1.7)........................................................... 19

45.2.1.7 PMA/PMD status 2 register (Register 1.8)............................................................. 19

45.2.1.7.4 Transmit fault (1.8.11) .................................................................................. 19

45.2.1.7.5 Receive fault (1.8.10).................................................................................... 20

45.2.1.8 PMD transmit disable register (Register 1.9) ......................................................... 20

45.2.1.21 400G PMA/PMD extended ability register (Register 1.24) ................................... 21

45.2.1.21.1b 400GBASE-SR4.2 ability (1.24.7) ............................................................... 21

45.2.1.21.1c 400GBASE-SR8 ability (1.24.6) .................................................................. 21

78. Energy-Efficient Ethernet (EEE) .......................................................................................................... 22

78.1 Overview..................................................................................................................................... 22

78.1.4 PHY types optionally supporting EEE ............................................................................. 22

116. Introduction to 200 Gb/s and 400 Gb/s networks ................................................................................. 23

116.1 Overview..................................................................................................................................... 23

116.1.2 Relationship of 200 Gigabit and 400 Gigabit Ethernet to the ISO OSI reference

model ................................................................................................................................ 23

116.1.3 Nomenclature.................................................................................................................... 23

116.1.4 Physical Layer signaling systems ..................................................................................... 24

116.2 Summary of 200 Gigabit and 400 Gigabit Ethernet sublayers ................................................... 24

116.2.5 Physical Medium Dependent (PMD) sublayer ................................................................. 24

116.4 Delay constraints......................................................................................................................... 24

116.5 Skew constraints ......................................................................................................................... 25

138. Physical Medium Dependent (PMD) sublayer and medium, type 50GBASE-SR,

100GBASE-SR2, 200GBASE-SR4, 400GBASE-SR8 ........................................................................ 27

138.1 Overview..................................................................................................................................... 27

138.1.1 Bit error ratio .................................................................................................................... 29

138.2 Physical Medium Dependent (PMD) service interface .............................................................. 30

138.3 Delay and Skew .......................................................................................................................... 31

138.3.1 Delay constraints............................................................................................................... 31

138.3.2 Skew Constraints .............................................................................................................. 31

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IEEE Std 802.3cm-2020

IEEE Standard for Ethernet—Amendment 7:

Physical Layer and Management Parameters for 400 Gb/s over Multimode Fiber

138.3.2.2 Skew Constraints for 100GBASE-SR2, and 200GBASE-SR4, and

400GBASE-SR8 ..................................................................................................... 31

138.4 PMD MDIO function mapping................................................................................................... 31

138.5 PMD functional specifications.................................................................................................... 32

138.5.1 PMD block diagram.......................................................................................................... 32

138.5.2 PMD transmit function ..................................................................................................... 33

138.5.3 PMD receive function ....................................................................................................... 34

138.5.4 PMD global signal detect function ................................................................................... 34

138.5.5 PMD lane-by-lane signal detect function ......................................................................... 34

138.5.8 PMD lane-by-lane transmit disable function (optional) ................................................... 35

138.6 Lane assignments........................................................................................................................ 35

138.7 PMD to MDI optical specifications for 50GBASE-SR, 100GBASE-SR2, and

200GBASE-SR4, and 400GBASE-SR8 ..................................................................................... 35

138.7.1 Transmitter optical specifications..................................................................................... 35

138.7.2 Receiver optical specifications ......................................................................................... 36

138.7.3 Illustrative link power budget ........................................................................................... 36

138.8 Definition of optical parameters and measurement methods...................................................... 37

138.8.1 Test patterns for optical parameters.................................................................................. 37

138.8.5 Transmitter and dispersion eye closure for PAM4 (TDECQ) .......................................... 37

138.8.5.1 TDECQ reference equalizer.................................................................................... 37

138.8.10 Stressed receiver sensitivity.............................................................................................. 37

138.9 Safety, installation, environment, and labeling........................................................................... 38

138.9.2 Laser safety ....................................................................................................................... 38

138.9.4 Environment...................................................................................................................... 38

138.9.5 Electromagnetic emission ................................................................................................. 38

138.9.7 PMD labeling requirements .............................................................................................. 38

138.10 Fiber optic cabling model ........................................................................................................... 38

138.10.1 Fiber optic cabling model ................................................................................................. 38

138.10.3 Medium Dependent Interface (MDI) ................................................................................ 38

138.10.3.1 Optical lane assignments for 100GBASE-SR2, and 200GBASE-SR4, and

400GBASE-SR8 ..................................................................................................... 39

138.10.3.4 MDI requirements for 400GBASE-SR8................................................................. 40

138.11 Protocol implementation conformance statement (PICS) proforma for Clause 138, Physical

Medium Dependent (PMD) sublayer and medium, type 50GBASE-SR, 100GBASE-SR2,

200GBASE-SR4, 400GBASE-SR8............................................................................................ 41

138.11.1 Introduction....................................................................................................................... 41

138.11.2 Identification..................................................................................................................... 41

138.11.2.2 Protocol summary ................................................................................................... 41

138.11.3 Major capabilities/options................................................................................................. 42

138.11.4 PICS proforma tables for Physical Medium Dependent (PMD) sublayer and

medium, type 50GBASE-SR, 100GBASE-SR2, 200GBASE-SR4, 400GBASE-SR8 .... 42

138.11.4.1 PMD functional specifications................................................................................ 43

138.11.4.6 Characteristics of the fiber optic cabling and MDI................................................. 43

150. Physical Medium Dependent (PMD) sublayer and medium, type 400GBASE-SR4.2 ........................ 46

150.1 Overview..................................................................................................................................... 46

150.1.1 Bit error ratio .................................................................................................................... 47

150.2 Physical Medium Dependent (PMD) service interface .............................................................. 47

150.3 Delay and Skew .......................................................................................................................... 48

150.3.1 Delay constraints............................................................................................................... 48

150.3.2 Skew constraints ............................................................................................................... 48

150.4 PMD MDIO function mapping................................................................................................... 49

150.5 PMD functional specifications.................................................................................................... 49

Authorized licensed use limited to: ping cai. Downloaded on December 19,2021 at 06:30:31 UTC from IEEE Xplore. Restrictions apply.

IEEE Std 802.3cm-2020

IEEE Standard for Ethernet—Amendment 7:

Physical Layer and Management Parameters for 400 Gb/s over Multimode Fiber

150.5.1 PMD block diagram.......................................................................................................... 50

150.5.2 PMD transmit function ..................................................................................................... 50

150.5.3 PMD receive function ....................................................................................................... 50

150.5.4 PMD global signal detect function ................................................................................... 51

150.5.5 PMD lane-by-lane signal detect function ......................................................................... 52

150.5.6 PMD reset function........................................................................................................... 52

150.5.7 PMD global transmit disable function (optional) ............................................................. 52

150.5.8 PMD lane-by-lane transmit disable function (optional) ................................................... 52

150.5.9 PMD fault function (optional) .......................................................................................... 52

150.5.10 PMD transmit fault function (optional) ............................................................................ 52

150.5.11 PMD receive fault function (optional).............................................................................. 53

150.6 Wavelength ranges...................................................................................................................... 53

150.7 PMD to MDI optical specifications for 400GBASE-SR4.2 ....................................................... 53

150.7.1 Transmitter optical specifications..................................................................................... 54

150.7.2 Receiver optical specifications ......................................................................................... 54

150.7.3 Illustrative link power budget ........................................................................................... 56

150.8 Definition of optical parameters and measurement methods...................................................... 56

150.8.1 Test patterns for optical parameters.................................................................................. 56

150.8.1.1 Multi-lane testing considerations............................................................................ 57

150.8.2 Center wavelength and spectral width .............................................................................. 57

150.8.3 Average optical power ...................................................................................................... 57

150.8.4 Outer Optical Modulation Amplitude (OMAouter).......................................................... 57

150.8.5 Transmitter and dispersion eye closure for PAM4 (TDECQ) .......................................... 58

150.8.5.1 TDECQ reference equalizer.................................................................................... 58

150.8.6 Extinction ratio ................................................................................................................. 58

150.8.7 Transmitter transition time................................................................................................ 58

150.8.8 Relative intensity noise (RIN12OMA) ............................................................................. 59

150.8.9 Receiver sensitivity........................................................................................................... 59

150.8.10 Stressed receiver sensitivity.............................................................................................. 60

150.8.10.1 Sinusoidal jitter for receiver conformance test ....................................................... 61

150.9 Safety, installation, environment, and labeling........................................................................... 61

150.9.1 General safety ................................................................................................................... 61

150.9.2 Laser safety ....................................................................................................................... 61

150.9.3 Installation ........................................................................................................................ 61

150.9.4 Environment...................................................................................................................... 62

150.9.5 Electromagnetic emission ................................................................................................. 62

150.9.6 Temperature, humidity, and handling............................................................................... 62

150.9.7 PMD labeling requirements .............................................................................................. 62

150.10 Fiber optic cabling model ........................................................................................................... 62

150.10.1 Fiber optic cabling model ................................................................................................. 63

150.10.2 Characteristics of the fiber optic cabling (channel) .......................................................... 63

150.10.2.1 Optical fiber cable................................................................................................... 63

150.10.2.2 Optical fiber connection.......................................................................................... 64

150.10.2.2.1 Connection insertion loss.............................................................................. 64

150.10.2.2.2 Maximum discrete reflectance...................................................................... 64

150.10.3 Medium Dependent Interface (MDI) ................................................................................ 64

150.10.3.1 Optical lane assignments ........................................................................................ 65

150.10.3.2 MDI requirements................................................................................................... 65

150.11 Protocol implementation conformance statement (PICS) proforma for Clause 150, Physical

Medium Dependent (PMD) sublayer and medium, type 400GBASE-SR4.2............................. 66

150.11.1 Introduction....................................................................................................................... 66

150.11.2 Identification..................................................................................................................... 66

150.11.2.1 Implementation identification................................................................................. 66

150.11.2.2 Protocol summary ................................................................................................... 66

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