QSFP+4X28Gb/s Connector(SFF-8662 Rev2.9)规格更新

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"SFF-8662-2.9.pdf" 本文档是关于QSFP+4X28Gb/s Connector（Style A）的规格标准，SFF-8662 Rev2.9版本，发布于2018年6月8日，由SNIA（存储网络行业协会）发布。此规范定义了QSFP+ 0.8mm连接器的物理接口和一般性能要求，该连接器设计用于高速串行互连应用，如28Gb/s QSFP+主机插座与28Gb/s QSFP+模块或电缆的配对。在技术细节方面，文档进行了以下更新： 1. 在表4-2中，将"Peg to Row B"的间距文本更改为"7.69 +/- 0.10"，这可能涉及连接器的机械定位精度，确保插针与接触排之间的精确配合。 2. 插入损耗（Insertion Loss）的最大频率要求从12.5 GHz提高到14 GHz，这反映了对更高频率下的信号传输质量的提升要求，以保持与SFF-8662标准的一致性。 3. 返回损耗（Return Loss）和共模通过转换（Common Mode Through Conversion）的要求最大频率从25 GHz降低到14 GHz，这可能是因为在较低频率下，这些参数可以更好地满足互操作性和信号完整性需求。 QSFP28是一种四通道、28吉比特每秒的光收发器模块，广泛应用于数据中心和高性能计算网络中，提供高密度的数据传输能力。QSFP+ 4X28Gb/s Connector是支持这种高速模块的关键组件，它需要在电气和光学性能上达到严格的规范要求，以确保在不同供应商的设备之间实现无缝互操作。文档还指出，虽然这个规范定义了连接器的特性，但并不能保证供应商实际提供该组件。如果供应此类连接器，必须符合本规范，以确保与其他符合标准的设备兼容。此外，该规范鼓励公众审阅并提供反馈，收到的意见将被考虑用于未来版本的修订。 SFF-8662 Rev2.9为QSFP+ 4X28Gb/s Connector设定了详细的技术指标和性能基准，对于设计、制造和集成高速网络系统的企业和工程师具有重要参考价值。

PUBLISHED SFF-8662 Rev 2.9

QSFP+ 4X 28 Gb/s Connector (Style A) Page 5

Foreword

The development work on this specification was done by the SNIA SFF TWG, an

industry group. Since its formation as the SFF Committee in August 1990, the

membership has included a mix of companies which are leaders across the industry.

When 2 1/2" diameter disk drives were introduced, there was no commonality on

external dimensions e.g. physical size, mounting locations, connector type,

connector location, between vendors. The SFF Committee provided a forum for system

integrators and vendors to define the form factor of disk drives.

During their definition, other activities were suggested because participants in

SFF faced more challenges than the form factors. In November 1992, the charter was

expanded to address any issues of general interest and concern to the storage

industry. The SFF Committee became a forum for resolving industry issues that are

either not addressed by the standards process or need an immediate solution.

In July 2016, the SFF Committee transitioned to SNIA (Storage Networking Industry

Association), as a TA (Technology Affiliate) TWG (Technical Work Group).

Industry consensus is not a requirement to publish a specification because it is

recognized that in an emerging product area, there is room for more than one

approach. By making the documentation on competing proposals available, an

integrator can examine the alternatives available and select the product that is

felt to be most suitable.

SFF meets during the T10 (see www.t10.org) and T11 (see www.t11.org) weeks, and

SSWGs (Specific Subject Working Groups) are held at the convenience of the

participants.

Many of the specifications developed by SFF have either been incorporated into

standards or adopted as standards by ANSI, EIA, JEDEC and SAE.

For those who wish to participate in the activities of the SFF TWG, the signup for

membership can be found at:

http://www.snia.org/sff/join

The complete list of SFF Specifications which have been completed or are currently

being worked on by the SFF Committee is contained in the document SFF-8000 which

can be found at:

http://www.snia.org/sff/specifications

Suggestions for improvement of this specification will be welcome, they should be

submitted to:

http://www.snia.org/feedback

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