Hello Doug – in your tidbit you indicated that the pwb layout was (likely) responsible for the increased emissions at the below 100MHz range. It has been my experience that when the magnetics are placed inside a connector, that the emissions are more influenced from the imbalance in the cores and assembly that the layout. Nowadays there is literally no ambiguity in the layout – the traces go from the phy in the SoC to the connector - that’s it! [I am assuming that the design guidelines from the connector/phy manufacturer are being followed] Also how do you isolate the influence of the cable in your measurements? After all the internal signal wires could be twisted differently as you move the cable... Y/N??
Best Regards Charles Grasso Compliance Engineer Echostar Communications (w) 303-706-5467 (c) 303-204-2974 (t) [email protected] (e) [email protected] (e2) [email protected] From: Doug Smith [mailto:[email protected]] Sent: Sunday, October 18, 2015 1:49 PM To: [email protected] Subject: Re: [PSES] PoE Injectors Hi Bill, Keep in mind that many POE adapters on the market will cause an emissions problem because they are poorly designed and unbalance the Ethernet pairs creating common mode currents. See my Technical Tidbit at http://www.emcesd.com/tt2011/tt080111.htm When you open some of them and look at the design, it is obvious they were not designed by engineers. Doug Department for Continuing Education Oxford, Oxfordshire, United Kingdom -------------------------------------------------- Doug Smith P.O. Box 60941 Boulder City, NV 89006-0941 TEL/FAX: 702-570-6108/570-6013 Mobile: 408-858-4528 Email: [email protected]<mailto:[email protected]> Web: http://www.dsmith.org -------------------------------------------------- On Sun, 18 Oct 2015 18:50:30 +0000, Bill Owsley <[email protected]<mailto:[email protected]>> wrote: Somewhere in the references at the end, you might find which devices that these standards apply to. There are number of exceptions. And there may have been changes since doc was published. In the past I have emailed Victor with questions. - Bill ________________________________ From: Scott Douglas <[email protected]<mailto:[email protected]>> To: [email protected]<mailto:[email protected]> Sent: Sunday, October 18, 2015 2:04 AM Subject: [PSES] PoE Injectors Hello All, I am wondering if PoE injectors need to be ErP compliant? If so, what efficiency level? Does anyone know of any such injectors that are compliant? The injector would be used to power a product and not a switch, router, or access point. Any and all comments appreciated. Regards, Scott - ---------------------------------------------------------------- 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 <[email protected]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher: <[email protected]<mailto:[email protected]>> David Heald: <[email protected]<mailto:[email protected]>> - ---------------------------------------------------------------- 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 <[email protected]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[email protected]>> - ---------------------------------------------------------------- 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 <[email protected]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[email protected]>> - ---------------------------------------------------------------- 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
