Dan is correct, but first make sure the lab did the test correctly, most do not in my experience leading to often a 6 dB over test. When I have pointed this out to test labs during testing, they always correct their testing when shown the paragraph about the current limit. After the test is run correctly. it may be the other side of the Ethernet that is the problem instead of the EUT. After these are exhausted, then look at your circuit as per Dan's excellent suggestions.
Doug Smith Sent from my iPhone IPhone: 408-858-4528 [tel:408-858-4528] Office: 702-570-6108 [tel:702-570-6108] Email: d...@dsmith.org Website: http://dsmith.org On Thu, Dec 10, 2015 at 06:16, Dan Roman, N.C.E. <danp...@verizon.net> wrote: Amund, You did not mention if it was 100Base-T or Gigabit but I have found both to be pretty robust in immunity testing. I would look first at what may be causing what you have to lose communication rather than try to filter out common mode currents. Because it is a differential interface a poorly constructed cable can contribute to problems if the wires that make up the pairs are of considerably different lengths. Same goes for the PCB routing, are the pairs treated as such and very well constrained with each other in length and pair spacing? -- Dan Roman, N.C.E. Senior Member, IEEE IEEE Product Safety Engineering Society mailto:dan.ro...@ieee.org [dan.ro...@ieee.org] [http://www.ieee-pses.org/] http://www.ieee-pses.org [http://www.ieee-pses.org] On 12/10/15, Amund Westin<am...@westin-emission.no> wrote:I have a failure when testing Conducted RF injected (IEC/EN61000-4-6) on Ethernet cable. Lose communication in the test range 20-80MHz (10Vrms 80% AM). Possible actions: 1. Snap on ferrite inside the EUT (do not want this action) 2. The RJ45 connector on the EUT has a little PCB and ferrite beads can be mounted by cutting the traces and place the beads onto each lines. Anybody who has a positive experience, eliminate immunity failures on Ethernet by introducing ferrite beads? … or is a Common Mode Choke Array more recommended? Regards Amund - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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