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All,
The presentation is now available on the NGAUTO site. Please see the link below.
From: NATALIE WIENCKOWSKI [mailto:nwienckowski@xxxxxxx]
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> 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]
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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- On Apr 4, 2018, at 6:04 AMPDT, Fritsche, Matthias <Matthias.Fritsche@xxxxxxxxxxx> wrote: Thanks George for the information. Hello to all, I review the last days for another project the market for field testers. The best handheld cable testers I found in the market can measure up to 2GHz or 2,5GHz bandwidth. Some of the HF experts in our lab and
the market pointed out only below 3 to 3,5GHz bandwidth such handheld tester are possible and economical feasible. For higher frequencies the high-end lab equipment (Vector Network Analyzer) is needed. Following the discussion about the bandwidth for Multi-Gig
Ethernet we should have this point in mind. All cable harnessing’s must be tested from the harnessing production before the wire harness installed into the car. And the price for the test equipment and the testing cost are also important for the car industry.
Also for maintenance in the field test equipment is needed. From this point of view my understanding is we should use a bandwidth below 3 to 3,5GHz. 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. So far my comment on this point. Any comment and other arguments are welcome. Very nice greetings from Germany Matthias Best regards / Mit freundlichen Grüßen
HARTING Electronics GmbH, Marienwerderstraße 3, D-32339 Espelkamp; Registergericht: Amtsgericht Bad Oeynhausen; Register-Nr.: HRB
8808; Geschäftsführer: Dipl.-Kfm. Edgar-Peter Düning, Dipl.-Wirtsch.-Ing. Ralf Martin Klein, Dipl.-Ing. Uwe Gräff, Dipl.-Ing. (FH), Dipl.-Wirtsch.-Ing. (FH) Andreas Conrad From: George Zimmerman <george@xxxxxxxxxxxxxxxxxxxx> Due to lack of contributions, the 4 April ad hoc is cancelled. Our next ad hoc will be on 18 April. Please let me know if you wish to make
a contribution. George A. Zimmerman, Ph.D. CME Consulting, Inc. Experts in PHYsical Layer Communications 310-920-3860 To unsubscribe from the STDS-802-3-NGAUTO list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-NGAUTO&A=1 To unsubscribe from the STDS-802-3-NGAUTO list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-NGAUTO&A=1 To unsubscribe from the STDS-802-3-NGAUTO list, click the following link:
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