OIF MLG 2.0：100Gbps多链路齿轮箱协议详解

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OIF MLG 2.0协议规范是Optical Internetworking Forum (OIF) 提出的一项关键标准，它关注于多链接齿轮箱（Multi-Link Gearbox）技术在100吉比特/秒光网络中的应用与互操作性。这个协议的核心在于解决高速数据传输中的带宽管理和复用问题。具体来说，OIF MLG 2.0定义了10:4 Mux Gearbox，这种设备可以将单个100吉比特/秒信号拆分成10个25吉比特/秒的车道进行并行传输，从而实现更高的带宽利用率。另一方面，4:10 DeMux Gearbox则负责将这4个独立的25吉比特/秒车道重新组合成一个100吉比特/秒的信号，确保了数据在不同速率接口之间的无缝转换。 OIF作为一个国际性的非盈利组织，拥有超过90家会员公司，包括全球领先的运营商和供应商，致力于推动可互操作、经济高效且坚固的光纤网络及其相关技术的发展。通过与众多标准制定机构如IEEE、IETF、ITU-T等建立合作关系，OIF MLG 2.0协议旨在确保全球范围内光学网络产品的兼容性和一致性，促进技术的标准化进程。在OIF MLG 2.0实施协议创建和批准于2013年4月后，该规范为数据和光学通信领域内的企业提供了统一的接口和操作框架，使得不同的硬件和软件能够在复杂的网络环境中协同工作。对于那些关心光纤网络架构、路由器和数据交换机互联技术的人来说，理解并遵循OIF MLG 2.0协议至关重要，因为它不仅影响系统的性能，还影响着整个网络的成本效益和可靠性。如果你想要深入了解OIF MLG 2.0的详细技术细节、实现方法或具体的接口定义，可以访问OIF的官方网站（www.oiforum.com），那里会提供完整的技术文档和联系信息，以便获取进一步的技术支持和咨询。对于网络工程师、系统集成商以及任何希望优化光纤网络性能的专业人士来说，熟悉并掌握这一协议是提升网络效率和满足未来高速数据传输需求的关键。

IA OIF-MLG-02.0

Multi-link Gearbox 2.0 Implementation Agreement

www.oiforum.com 7

5 Introduction

The MLG (Multi-link Gearbox) 2.0 implementation agreement defines an in-band coding

that allows independent 10GBASE-R and 40GBASE-R signals to transit 4x25G and

8x25G gearboxes implementing a 100GBASE-R PMA function (or an expanded 8x25G

lane variant). This enables a variety of applications to reuse 100GBASE-R technology

for the transport of individual 10G and 40G links.

5.1 Requirements

Two applications are defined:

 The MLG 2.0 4x25G gearbox application maps 10GBASE-R and/or 40GBASE-R

signals over 20 MLG lanes, with five MLG lanes bit-multiplexed over each

physical 25G lane. Two groups of eight MLG lanes can each be configured to

carry four 10GBASE-R signals or a single 40GBASE-R signal, while the

remaining four MLG lanes can carry two 10GBASE-R signals. When both of the

8 MLG lane groups are configured to carry four 10GBASE-R signals, the MLG

2.0 4x25G gearbox is compatible with, and can be interconnected with, an MLG

1.0 gearbox.

 The MLG 2.0 8x25G gearbox application maps 10GBASE-R and/or 40GBASE-R

signals over 40 MLG lanes, with five MLG lanes bit-multiplexed over each

physical 25G lane. Five groups of eight MLG lanes can each be configured to

carry four 10GBASE-R signals or a single 40GBASE-R signal. While a particular

device might be implemented so that it can be configured to provide two 4x25G

gearbox applications or a single 8x25G gearbox application, the two applications

cannot be interconnected.

The MLG 2.0 4x25G mux encodes from zero to ten 10GBASE-R signals compliant with

IEEE Std 802.3

-2012 clauses 49 and 51, and from zero to two 40GBASE-R signals

compliant with IEEE Std 802.3-2012 clauses 82 and 83 into a format consistent with the

IEEE Std 802.3-2012 clause 83 PMA service interface (e.g., four physical lanes of

25.78125 Gb/s ±100ppm). The MLG 2.0 4x25G demux decodes the format produced by

the MLG 2.0 4x25G mux to produce from zero to ten 10GBASE-R signals and from zero

to two 40GBASE-R signals. When configured to carry only 10GBASE-R signals, the

MLG 2.0 4x25G mux can be interconnected with an MLG 1.0 demux, and an MLG 1.0

mux can be interconnected with an MLG 2.0 4x25G demux. Note – for applications

requiring only support of two 40GBASE-R signals over four physical lanes (without

10GBASE-R support), the approach described in Appendix B may also be considered.

The MLG 2.0 8x25G mux encodes from zero to twenty 10GBASE-R signals compliant

with IEEE Std 802.3-2012 clauses 49 and 51 and from zero to five 40GBASE-R signals

compliant with IEEE Std 802.3-2012 clauses 82 and 83 into a format consistent with an

expanded interface similar to a double-width 100GBASE-R PMA (as if it were comprised

of double the number of PCS lanes striped over double the number of physical lanes

within the same skew and skew variation limits). The MLG 2.0 8x25G demux decodes

the format produced by the MLG 2.0 8x25G mux to produce from zero to twenty

10GBASE-R signals and from zero to five 40GBASE-R signals.

The MLG 2.0 mux to MLG 2.0 demux link preserves the compliance to IEEE Std 802.3-

2012 clauses 49 and 51 of each 10GBASE-R signal and the compliance to IEEE Std

802.3-2012 clauses 82 and 83 of each 40GBASE-R signal. Note that the exact bit

sequence of a given 10GBASE-R signal or 40GBASE-R signal is not preserved across

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