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PUBLISHED SFF-8679 Revision 1.8

QSFP+ 4X Hardware and Electrical Specification Page 1

SFF specifications are available at http://www.snia.org/sff/specifications

SFF-8679

Specification for

QSFP+ 4X Hardware and Electrical Specification

Revision 1.8 October 4, 2018

Secretariat: SFF TA TWG

Abstract: This specification defines the contact pads, the electrical, power

supply, ESD and thermal characteristics of the pluggable QSFP+ module or cable

plug.

There are multiple generations of QSFP+ that reference this specification:

SFF-8635 QSFP+ 4X 10 Gb/s Pluggable Transceiver Solution (QSFP10)

SFF-8685 QSFP+ 4X 14 Gb/s Pluggable Transceiver Solution (QSFP14)

SFF-8665 QSFP+ 4X 28 Gb/s Pluggable Transceiver Solution (QSFP+)

This specification supersedes the base electrical content of SFF-8436 QSFP+ 10Gb/s

4X Pluggable Transceiver.

This document provides a common specification for systems manufacturers, system

integrators, and suppliers.

This draft specification is made available for public review, and written comments

are solicited from readers. Comments received at http://www.snia.org/feedback will

be considered for inclusion in future revisions of this specification.

SFF TA TWG POINTS OF CONTACT:

Editor: david.lewis@lumentum.com

Chairman: SFF-Chair@snia.org

Public feedback: http://www.snia.org/feedback

PUBLISHED SFF-8679 Revision 1.8

QSFP+ 4X Hardware and Electrical Specification Page 2

Change History

Rev 1.5:

- Moved referenced SFF specs to 2.1 Industry Documents and expanded the list.

Rev 1.6:

- Updated Figure 1 to show retimers.

- Removed two-wire interface timing diagram which is now in SFF-8636.

- Complete rewrite of power supply section to add support for Power Classes 5

to 7.

- Added section 8 "Timing Requirements".

Rev 1.7

- Editorial only, no technical changes.

Rev 1.8

- Converted to SNIA SFF template.

- Editorial updates throughout.

- Title changed to “Hardware and Electrical” to better reflect contents

- Updated abstract

- Updated editor contact information.

- Section 1 Scope – rewrote to better reflect content.

- Section 2 References – replaced several entries with updated document

numbers and names.

- Section 2.3 Acronyms – deleted several unused entries and added several

new ones based on content.

- Section 3 General Description – Rewrote most of this section to reflect

updated content. Added several relevant applications to Table 3-1.

- Section 4 Compliance Testing – updated Figure 4-1 and corrected test point

descriptions in Table 4-1.

- Section 5 Electrical Specification –

o Updated Figure 5-1 and Table 5-1 to show the new dual-purpose

signals LPMode/TxDis and IntL/RxLOSL on pads 31 and 28

respectively. Rewrote Note 2 of Table 5-1 for clarity.

o Replaced “pin” by “pad” throughout

o Replaced Figures 5-2 and 5-3 to better reflect current

applications.

o Extensive updates of Section 5.3 describing Low Speed Signals.

o Updates to Table 5-2 to explain SCL and SDA electrical

requirements and maximum pull-up resistor values for 400 kHz

operation.

o Significant revisions to text in 5.4 Low Speed Signal Electrical

Specifications and 5.5 High Speed Signal Electrical

Specifications.

o Re-ordered and rewrote section 5.6 Power Supply Requirements

including adding a new Power Class 8 with a maximum power limited

only by the connector current rating.

- Section 6 Mechanical and Board Definition – cleaned up this section to

reference the relevant documents instead of including non

hardware/electrical features.

- Section 7 Environmental and Temperature – added a “custom” temperature

class for modules that do not comply with any of the legacy case

temperature ranges, e.g., hyperscale data center applications.

- Section 8 Timing Requirements

o Major updates to Table 8-1 including re-writes of many entries in

the “Conditions” column.

o Changed limit for “Reset Init Assert Time” from a maximum of 2 us

PUBLISHED SFF-8679 Revision 1.8

QSFP+ 4X Hardware and Electrical Specification Page 4

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 http://www.incits.org/committees/t10) and T11 (see

http://www.incits.org/committees/t11) 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 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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