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All,
We do not use hand held testers to check cables built into the car.
We require the cables to be tested by the supplier at their facility before they are shipped to GM.
Once they are in the vehicle, we use the PHY/Switch TDR functions, if they exist, to determine where a cable fault may be. We can also use information on which ECUs are participating in the communication to narrow down the issue.
When it comes to repair, we will replace segments between connectors, in-line or end. If we aren't sure which one it is, we will replace segments until the issue is fixed. We will not try to repair a cable as it will likely not meet the requirements for the
cable. I gave a presentation on this topic for 100BASE-T1 at the 2016 Automotive Ethernet Congress. If you are interested in this, please let me know and I can send you a copy.
Natalie Wienckowski
From: DiBiaso, Eric <eric.dibiaso@xxxxxx>
Sent: Tuesday, April 10, 2018 3:37 PM To: STDS-802-3-NGAUTO@xxxxxxxxxxxxxxxxx Subject: Re: [802.3_NGAUTO] Wednesday 4 April NGAUTO ad hoc cancelled All,
I do not have firsthand experience with field test equipment as Matthias, Geoff, and George have been describing, so I can’t really comment on their feasibility or relative cost as frequency increases. However, my comment lies in the Automotive Industries need for such equipment.
The reason I bring this up, is that cars built today have coaxial link segments requiring component validation and testing up to 6GHz, and to my knowledge I have not heard of such test equipment issues. So that brings up the following questions that could best be answered by our OEM colleagues:
Best Regards, Eric
From: George Zimmerman [mailto:george@xxxxxxxxxxxxxxxxxxxx]
The following message was sent from an external e-mail address. Be cautious when clicking on links, opening attachments or providing sensitive information. Geoff, and all – I would add that my (independent) experience with field testers has been similar to what Matthias reports. I can confirm field testers in the 2-3 GHz band, but beyond that is substantially more difficult. Many of us remember the work done in conjunction with Cat 8 cabling to get field testing to 2 GHz. It is not trivial, but, at this point multiple vendors have gotten to that point. While 3 GHz is not a huge extension, extending the frequency of practical testers for field and assembly environments by another octave or more is a nontrivial task. Those involved in the cabling industry know that specifications for high performance cabling are often limited by the capabilities of test. And that is not to mention the extra difficulties brought in by the harsher automotive environment. -george George Zimmerman, Ph.D. President & Principal CME Consulting, Inc. Experts in Advanced PHYsical Communications 310-920-3860
From: Geoff Thompson [mailto:thompson@xxxxxxxx]
Colleagues-
Matthias point is well made. Please remember that harnesses will have to be tested in automotive body shops and repair shops around the world including lesser developed countries. The automotive market is a world-wide market. Maintainability of high speed networks will be a major factor and challenge to their adoption.
Geoff Thompson GraCaSI S.A.
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