Dan, Emissions Ethernet test repeatability is improved by a loopback program that broadcasts continual data. Be sure the loopback perimeter includes the cable (beyond the driver chip). Terminate the Ethernet TP cable into a Class B hub; it is easier to explain than a 100-ohm dummy load. Although continual data transfer is 'real world' the measurement is not real world, you measure AE emission 50% of the time.
Immunity Continual data transfer is best. Use at least 2 nodes in AE to prevent Ethernet from auto-negotiating to full-duplex, a collision-free domain. Full duplex is not worst case - it trivially passes immunity because 'collision-detect' is inhibited. TV wiring is not critical, impedance match is a given. Document the wiring and AE. David -----Original Message----- From: Dan Pierce [mailto:[email protected]] Sent: Wednesday, December 11, 2002 12:18 PM To: '[email protected]' Subject: ITE / AV Equipment with Ethernet Dear Group, I currently have a device that is a cross between ITE and AV (a typical set top box) which has Ethernet. I am wondering how to terminate the line for testing both emissions and immunity. In addition, should I have this Ethernet setting so that I transmit data in a 1 meter loop back cable? Would a connection to a hub with no other lines to/from be legal? Any responses are greatly appreciated. Sincerely, -Dan Pierce ------------------------------------------- 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"
