Hello John, If it was indeed a peripheral then it would subjected to its own compliance requirements. In this case, the USB port cant be a peripheral as it is Included(mounted)within the PC. The older USB ports/drive that were cabled To a pc would be classified as a peripheral. I read this in a PC spec. sheet A while back. Regards Richard,
From: [email protected] [mailto:[email protected]] On Behalf Of John Woodgate Sent: Wednesday, February 07, 2007 1:36 PM To: [email protected] Subject: Re: USB Power Converter In message <785975EAC320644FA6447FCC7B73F11094B175@MILEXMIPV1.sdcorp.global.sandisk. com>, dated Wed, 7 Feb 2007, Sudhakar Wasnik <[email protected]> writes >Is the USB port seen as a Power source (5V/700mA) or communication >port? Both. A physical port doesn't necessarily have a unique function. > >Look form the PC makers side, when PC is goes for certification , will >it require to use all these novel accessories as a load and verify >compliance against each? > What is needed is a standard that specifies clearly the requirements (functional safety and EMC) for any third-party peripheral. Then the PC can be tested with a generic compliant peripheral, if necessary. I recall from the distant past a draft standard that required a manufacturer to take into account peripherals that could be developed in the future! I suspect whoever wrote that was only considering peripherals developed by the manufacturer, not others, but it's still a requirement for the use of a crystal ball! -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk There are benefits from being irrational - just ask the square root of 2. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
