Don, Since you did not identify your LAN protocol (Ethernet, Fast Ethernet, Token Ring, ArcNet, etc.) I will give you a general answer.
I know of three approaches to generate traffic: 1) Diagnostics programs from NIC vendors e.g. http://www.smc.com/smc/pages_html/homef.html You can send specific size packets for error checking. Short packets are good for EMC because various frequencies occur frequently. The old diag program timed out after 2500 packets, >>250ms. 2) LanTest software - various web sources This software continually exchanges files between two or more PCs (one acting as a server). Disadvantage is that some frequencies occur sporadically, making it difficult to interpret results into pass/fail (i.e. pulses). It is good for immunity tests because you can log a bit-error rate to measure degradation. 3) Traffic generator - Stand-alone boxes that simulate various percents of bandwidth usage are available to check network switches and routers. These are not necessarily real world. Isolate the output with an EMI-clean hub; the traffic box may be "Class A". Bottom line You probably need >>250ms sustained to perform any EMC test, but all these approaches can be set for over an hour running time. Any of the above will generate more than 10% utilization. Some hubs have a LEDs to indicate occupied bandwidth to verify utilization. David -----Original Message----- From: Don Rhodes [mailto:[email protected]] Sent: Monday, June 18, 2001 6:26 AM To: 'emc-pstc news group' Subject: Conducted EMI on telecommunication ports Dear colleagues, I am looking for a little of your collective understanding and experience on CISPR 22, 1997-11, Section 9.5.3. Regarding the requirement for >10% LAN utilization, sustained for >250mS, can you provide any guidance on development of the EUT software used for this test? Furthermore, our EUT is used only to receive data (with the exception of LAN protocol comm.), similar to a printer. Also, any thoughts on pitfalls and/or success of measurement and compliance to this portion of the requirements? Thanks in advance for your time. Don Rhodes ------------------------------------------- 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: Michael Garretson: [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://www.rcic.com/ click on "Virtual Conference Hall," ------------------------------------------- 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: Michael Garretson: [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://www.rcic.com/ click on "Virtual Conference Hall,"
