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Re: [802.3_NGAUTO] S4P Touchstone Files

Hi Eric,


Having the channel responses at higher frequencies beyond 3GHz will still be helpful for more accurate analysis of different coding/modulations, and sensitivity of each scheme to poor higher frequency response of the channel.

Ideally, it will be helpful to have a typical as well as a possible worst case scenario above 3GHz.





From: DiBiaso, Eric [mailto:eric.dibiaso@xxxxxx]
Sent: Monday, September 25, 2017 1:24 PM
To: STDS-802-3-NGAUTO@xxxxxxxxxxxxxxxxx
Subject: [802.3_NGAUTO] S4P Touchstone Files




I have received some questions concerning the Touchstone Files that are available on the private area of the NGAuto Website.  


First, to further clarify the data format a new README file has been uploaded to the website.   This README file illustrates the transformation required to convert the single ended S4p files to the mixed mode domain.  


Second, I have been asked if it would be possible to supply test data for the link segments above the current 3GHz up to 5GHz.   As I mentioned in Charlotte, the cables and connectors tested are only specified to maximum of 3GHz.  I can of course supply data to 5GHz, but it will have the following consequences: 


1.  The results may be poor for the higher frequencies

2.  The results at those higher frequencies may not be consistent if a different batch of samples from different production lots would be built and re-tested. 


With these 2 things in mind, we can provide the s4p data up to 5GHz. 


Please let me know if this higher frequency data would be valuable to your analysis. 


Best Regards,