April 5-7, 2022|Santa Clara Convention Center| Santa Clara, CA

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Tutorial – OSFP/QSFP-DD 112G PAM4 Channel for 800G System Applications


Xu Jiang  (Senior SI Engineer, Luxshare-Ict)

Andy Nowak  (Director of Quality, Luxshare-Ict)

Ivan Madrigal  (System Application Engineer, AMD)

Dana Bergey  (Sr. Manager, Luxshare-Ict)

Charles Grant  (Director of Bulk Cable, Luxshare-Ict)

Geoffrey Zhang  (Distinguished Engineer , AMD)

Location: Ballroom AB

Date: Tuesday, April 5

Time: 2:00 pm - 4:30 pm

Track: 13. Modeling & Analysis of Interconnects, 07. Optimizing High-Speed Link Design

Format: Tutorial

Theme : High-speed Communications

Education Level: All

Pass Type: All Access Pass

Vault Recording: TBD

Audience Level: All

The industry is developing systems to achieve 28.8Tbps aggregated bandwidth. This tutorial/paper presents an overview of challenges and solutions for OSFP/QSFP-DD 112G PAM4 applications. The tutorial/paper includes discussions of passive components of connector, raw cable and cable assembly design, and manufacturability and extreme environmental and reliability requirements. The available OSFP/QSFP-DD 112G PAM4 solutions are provided with detailed SI performance and COM/ERL analysis. The detailed discussions of 112G PAM4 SerDes design with 7nm FinFET technology is provided. Measured data based on the Silicon proved 112G PAM4 SerDes is presented. Measurements are taken on the links with multiple gauge and length of DAC cables. The tutorial/paper will provide system engineers a comprehensive understanding of OSFP/QSFP-DD 112G PAM4 channels.


The challenges and solutions for OSFP/QSFP-DD 112G PAM4 channels are introduced to audience. They will walk away with confidence for designing the 800G system using OSFP and QSFP-DD solutions. This broad overview will serve as guidelines for 800G system designs.

Intended Audience

1. Basic concept high speed serial link systems, including transmitter, channel, and receiver
2. Basic understanding system performance evaluation and analysis
3. Basic knowledge of channel s-parameter description, including insertion loss, return loss, crosstalk, etc.
4. Basic idea of PAM4 signaling and its relationship with NRZ signaling