I don’t have any automotive experience but I have worked with networks of all types in the past. The first network I ever worked on was back in the 1980s when Ethernet was still super expensive and used coax connections. The company I worked for created their own networking hardware that directly connected the driver/receiver to the coax line, no transformers. If I recall correctly it was as TTL 5V levels. Network addresses were set with DIP switches. I don’t remember what the speeds were but it was slower than commercially available Ethernet at the time. Whether a modern Ethernet chip will work without the transformer I cannot say.
The other thing the transformers do is provide some isolation. Are there safety or immunity concerns that would dictate having a transformer? ESD for example? I think the typical Ethernet transformer provides 1500Vrms of isolation. Dan From: Patrick [mailto:conwa...@gmail.com] Sent: Friday, March 21, 2025 10:07 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] ethernet magnetics I continue to look into questions on ethernet magnetics. For automotive applications, are magentics required if all nodes are within short distances and within a single vehicle? I always understood magnetics to be required for long cable runs and nodes at different ground references. The automotive vehicle is an exception to those two in that cable runs are not 100m, and all nodes share a common reference. Thanks in advance. Patrick. _____ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ <https://www.mail-archive.com/emc-pstc@listserv.ieee.org/%20> Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/> Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> List rules: https://pses.ieee.org/wp-content/uploads/2024/12/EM-PSTC-List-Rules.pdf For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net <mailto:msherma...@comcast.net> Rick Linford at: linf...@ieee.org <mailto:linf...@ieee.org> For policy questions, send mail to: Jim Bacher at: j.bac...@ieee.org <mailto:j.bac...@ieee.org> _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to EMC-PSTC@LISTSERV.IEEE.ORG All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://pses.ieee.org/wp-content/uploads/2024/12/EM-PSTC-List-Rules.pdf For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net Rick Linford at: linf...@ieee.org For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
