Hi Julian, EN55032 notes in table B.3 that the 10% utilisation is specifically for 10Base-T Ethernet traffic which is electrically mostly inactive when not transmitting data.
100Base-T and 1000Base-T both use scrambled_idle packets to maintain a 0V DC bias of the AC coupled Ethernet bus meaning they are constantly active. This is good enough for testing the emissions caused by the PHY/connector/cable part of a design but probably not the MAC and upstream (i.e. the bit that generates and handles the data). So perhaps this only need be a concern if you are testing 10Base-T specifically. Anyway that wasn't what you asked. If using Linux you could investigate using iperf to generate traffic and tc to throttle the traffic to a manageable level. Being Linux commands they are free and generally well documented. Also, if anyone has a copy of the report referenced in 55022 / 55032 for this clause I'd be interested in having a look. "[7] Haas, Lee & Christensen, Ken, LAN Traffic Conditions for EMI Compliance Testing, IBM Corporation, Research Triangle Park, NC." Hope this helps James Pawson EchoStar Europe From: Julian Jones [mailto:[email protected]] Sent: 11 March 2014 11:34 To: [email protected] Subject: [PSES] Ethernet Loading We have a rather convoluted way to load the ethernet lines to meet EN55022. Sec 9.6.3. I've looked on Google and found a few ping and data copy programmes, but I can't find a single program to do it all. I am hoping someone has found a simple program to make loading the port easy and getting the 10% traffic. Thanks in advance for any pointers. Julian Julian Jones Hursley EMC Services Tel: 023 8027 1111 ddi: 023 8024 0851 Mob: 07787 523 607 [email protected]<mailto:[email protected]> Trafalgar House, Trafalgar Close, Chandlers Ford EASTLEIGH, Hampshire, SO53 4BW Company Registration 3301279 - ---------------------------------------------------------------- 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]>
