What you should take into account is the failure criteria for 61000-4-6 as seen by the EU: No degradation beyond manufactueres specification.
Depending on the EUT just a few additional bit-errors at any of the tested frequencies may be a fail. It may not be sufficient to just look at loss of link. In many cases, a low level LAN-analyzer is needed to do this test. Otherwise, effects of lessere severeness than loosing link will not be detected, although they may be a fail of the test. David Pommerenke -----Original Message----- From: Chris Maxwell [mailto:[email protected]] Sent: Friday, April 19, 2002 7:53 AM To: [email protected] Subject: RE: Suitable CDN for IEC61000-4-6 ethernet 10/100 >From David Sterner's message: "Most people use the EM clamp. We test to EN50130-4 alarm system limits: 10V, pulsed and AM modulated. The test is trivial because of the inherent immunity of Ethernet; be sure you understand the EUT and AE port partitioning algorithms." What! The test is trivial because of the inherent immunity of Ethernet. The last product that I took through the lab couldn't even take 3V...heck, the Ethernet cable couldn't even take 3V being put on some of the other cables in the chassis. Now, before everybody sends me design tips for Ethernet immunity...save your breath... the chassis was a purchased computer. It was EMC tested (with only a dummy ethernet cable and no traffic, mind you). And I have no design control of the ethernet circuit. We ended up using shielded Ethernet cables and invoking the "3meter rule". The point that I'm trying to make is...I'm glad that this test is trivial for your products. Obviously, you have a good design there....(Where were you when we were looking for a compliant mainframe to use with our system?) But this type of immunity performance cannot be attributed to all Ethernet ports in general or to the Ethernet protocol in general. Best regards, Chris Maxwell | Design Engineer - Optical Division email [email protected] | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
