Kevin, I can't name a vendor, but I will try to help with some advices.
Probably all Ethernet hubs will show susceptibility during EFT, in which some data packets will be lost. The EFT happens to have large spectral amplitudes right in the middle of the 100 Base-T Ethernet signal (theoretically, up to 62.5 MHz, but the sensitivity and spectral content practically goes higher, since the front-ends may be open (bandwidth) much wider that 62.5 MHz. The good ones will not drop link though. Often, SmartBits or similar traffic generators are used for this test. Regardless of whether they are connected directly to DUT or indiractly through a hub, they often cause susceptibility in the test system - be careful if you use them. A better approach is writing your own SW routine for exercising and monitoring traffic, and if possible testing two of the same kind DUTs connected and talking to each other. Then, it doesn't matter which one fails. >From my past at Cisco, I remember designing SOHO routers (7xx, 8xx and 16xx family), some of which had 10 Mbit hubs or one-port 10/100 Base-T. At that time, we made sure they worked with 1 kV EFT on I/O and 2 kV EFT on the AC mains (data drop was allowd, but not a link drop). I am not sure if they still adhere to that standard, and if the have 10/100 hubs available now. I would recommend checking some of the well-established manufacturers, who typically have EMC design and test personnel and facilities and spend more effort for quality of the EMC design. Neven > > Good Members, > > I'm having some issues getting together a decent test set up for immunity > testing when I have a network connection at 100 Base -T. I've had several > hubs in the lab but I can't get one to even pass level 1 EFT testing ( for > CE EMC testing) . Would any of you be able to recommend a hub (100 Base T) > with a decent immunity tolerance. I'd love to get something immune at > industrial levels but at this point I would settle for just passing generic > levels > > Thanks > > Best Regards, > > > Kevin Harris > Manager, Approvals and CAD Services > Digital Security Controls > 3301 Langstaff Road > Concord, Ontario > CANADA > L4K 4L2 > > Tel: +1 905 760 3000 Ext. 2378 > Fax +1 905 760 3020 > > Email: [email protected] > > > ------------------------------------------- > 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] > > Archive is being moved, we will announce when it is back on-line. > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc 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] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
