I would like to expand this discussion slightly to include EN 55024. The definition of a telecommunications port is not quite so clear (in my opinion). If my product includes a Ethernet/LAN port specified for a CAT5 cable, does the additional functional test at discrete frequencies for conducted and radiated field immunity apply?
Jim Hulbert Pitney Bowes From: [email protected] [mailto:[email protected]] On Behalf Of Grasso, Charles Sent: Thursday, September 10, 2009 11:05 AM To: [email protected]; [email protected] Subject: RE: EMC question Michael – Why not? Isn’t the whole purpose of the CE EMC directive focused on the product FOR its intended use? Trying to predict the *future* use of a product (i.e – outside of its intended use) opens up Pandoras box. Chas ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, September 10, 2009 8:48 AM To: [email protected] Subject: RE: EMC question I would not focus on the intended use of a port, but rather on the maximum length specified for a cable of that particular interface. Twisted pair Ethernet (10/100/1000TX) is certainly within the domain of telecom ports. If an interface is specified up to 15m, I would not put it in that category. The intended use of an Ethernet port for connections within one rack would not qualify as an exception for me as the end use of the equipment may change over the the product lifetime and I expect that the maximum cable length will be used. Best regards, Michael Nagel Senior Staff EMC Test Engineer Embedded Computing Emerson Network Power T +49-89-9608-0 F +49-89-9608-2376 [email protected] www.emersonnetworkpower.com/embeddedcomputing Emerson Network Power - Embedded Computing GmbH, Lilienthalstr. 15, D-85579 Neubiberg/Landkreis München, Deutschland / Germany. Geschäftsführer Josef Wenzl, Amtsgericht München HRB 171431, VAT/USt.-ID: DE 127472241 ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Steve O'Steen Sent: Donnerstag, 10. September 2009 15:56 To: Pettit, Ghery; Ralph McDiarmid; [email protected] Subject: RE: EMC question Since cable length appears to be of significant importance in determining which cables are candidates for this test, why was it not added into one of the later revisions of EN55022? A LAN port spec’d by the customer for a CAT5e cable is an obvious Telecom port but, would it be omitted from this test if installation practice limited the cable from one shelf to another in the same rack? What if the same cable was intended to interface with an adjacent rack? If the concern is to limit the amount of interference that would re-radiate off the LAN cable(s) and potentially cause interference issues then, would maximum cable length based on the wavelengths of the test frequencies serve as justification to apply or not to apply this test? Is there any guidance available that addresses this issue and will help resolve some of these questions with a focus on the intent of the Telecom Port Emissions test? Best regards, Steve O'Steen Director, EMC Advanced Compliance Solutions, Inc. [email protected] 770-831-8048 ext. 210 www.acstestlab.com ****************CONFIDENTIAL**************** This e-mail and any attachments may contain information which is confidential, proprietary, privileged or otherwise protected by law. The information is solely intended for the named addressee (or a person responsible for delivering it to the addressee). If you are not the intended recipient of this message, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this e-mail in error, please notify the sender immediately by return e-mail and delete it from your computer. ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Pettit, Ghery Sent: Wednesday, September 09, 2009 4:32 PM To: Ralph McDiarmid; [email protected] Subject: RE: EMC question You are correct about the impact of the long cable. And this is not a normal intended use for RS-232. Thus it is not considered a telecom port unless you are doing something out of the ordinary. From: [email protected] [mailto:[email protected]] On Behalf Of Ralph McDiarmid Sent: Wednesday, September 09, 2009 1:29 PM To: [email protected] Subject: RE: EMC question I assume 1000’ of cable would force a low baud rate. (perhaps 300) Is it a valid to assume that is intended use of RS232 today? Ralph McDiarmid, AScT Compliance Engineering Group Xantrex Technology Inc From: [email protected] [mailto:[email protected]] On Behalf Of Pettit, Ghery Sent: Wednesday, September 09, 2009 9:07 AM To: Mike Hurley; Gartman, Richard Cc: [email protected] Subject: RE: EMC question The scenario that caused the addition of the “assuming it is used as intended” phrase was RS-232. RS-232 normally is limited to 15 meters of cable, and that was not considered to be telecom length. But, the Australian committee claimed that there were installations with 1000 feet of cable. Not running at full speed, obviously. Thus the qualifying phrase. Ghery From: [email protected] [mailto:[email protected]] On Behalf Of Mike Hurley Sent: Wednesday, September 09, 2009 9:03 AM To: Gartman, Richard Cc: [email protected] Subject: Re: EMC question Hi Richard, the 2006 edition of 55022 defines telecoms ports in section 3.6. The note to this section makes it clear that USB ports are not to be considered telecom ports. The above however does assume that the USB port is being used for its normal role of interconnecting components of an IT system. I'm sure someone will come up with a scenario whereby it could be considered to be a telecoms port! Mike Gartman, Richard wrote: In EN55022 there is a reference to a Telecommunication port. Is a USB connection considered a Telecommunication port? The USB has a power and two data lines. Does this make it a telecommunication port? Thank you for you assistance W. 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