2-port 40GbE/10GbE QSFP+ Signal Conditioner Reference Design


Design files


This verified reference design is a signal conditioning solution for front-port QSFP+ supporting two 40GbE ports compatible with 40G-CR4/SR4/LR4 and 10G SFF-8431 requirements. The design is applicable to optical and passive/active copper cables. It allows for reach extension between the Switch ASIC and the front-port QSFP+ which is often required for the outermost ports of a Top-of-Rack (ToR) switch or for add-in mezzanine implementations of QSFP+ line cards.

  • Front-port stacked QSFP+ implementation with signal conditioning to support 40GbE/10GbE optical and passive copper
  • Extends reach between Switch and front-port by up to 3x beyond nPPI/SFF-8431 host channel loss limit
  • Low-power/low-cost solution for front-port signal conditioning
  • Applicable to Top-of-Rack (ToR) switch and line card systems
  • Single power supply, no firmware required, no heatsink required, no reference clock required
  • Lab-tested HW example including 40GbE/10GbE-specific test data

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDC860.ZIP (65 K)

Detailed schematic diagram for design layout and components


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC861.ZIP (308 K)

Design file that contains information on physical board layer of design PCB

TIDRCH4.ZIP (1090 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.


DS125BR82012-Gbps 8-channel linear redriver with equalization

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* User guide TIDA-00417 DS125B 40GbE/10GbE QSFP Reference Design User's Guide (Rev. A) May 04, 2015
Technical article Differential pairs: four things you need to know about vias Jun. 10, 2015
Application note DS125BR820 Linear Repeater Used in 40GbE nPPI / SFF-8431 Applications Aug. 09, 2014

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