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Re: [802.3_NGAUTO] S4P Touchstone Files



New S4P Touchstone files with measurement data up to 5GHz has been uploaded to the website.  


Best Regards,




From: Ramin Farjad [mailto:Ramin.Farjad@xxxxxxxxxxxx]
Sent: Wednesday, September 27, 2017 10:27 PM
To: DiBiaso, Eric <eric.dibiaso@xxxxxx>; STDS-802-3-NGAUTO@xxxxxxxxxxxxxxxxx
Subject: RE: S4P Touchstone Files


The following message was sent from an external e-mail address. Be cautious when clicking on links, opening attachments or providing sensitive information.

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,