All,
Amendment 2 to CISPR 22, Edition 3 (Amendment A2 to EN 55022:1998) revised the definition of a telecommunication port in clause 3.6 by adding a note. The revised text reads, 3.6 telecommunications/network port point of connection for voice, data and signalling transfers intended to interconnect widely dispersed systems via such means as direct connection to multi-user telecommunications networks (e.g. public switched telecommunications networks (PSTN) integrated services digital networks (ISDN), x-type digital subscriber lines (xDSL), etc.), local area networks (e.g. Ethernet, Token Ring, etc.) and similar networks NOTE A port generally intended for interconnection of components of an ITE system under test (e.g. RS-232, IEEE Standard 1284 (parallel printer), Universal Serial Bus (USB), IEEE Standard 1394 (“Fire Wire”), etc.) and used in accordance with its functional specifications (e.g. for the maximum length of cable connected to it), is not considered to be a telecommunications/network port under this definition. Note the distinction contained in the note. The list is not exhaustive, but should illustrate the intent. Ports for connecting boxes in a system are not telecom. Ports for connecting “stuff” over a wide distance are telecom. Ghery S. Pettit, NCE From: [email protected] [mailto:[email protected]] On Behalf Of Joe Randolph Sent: Tuesday, September 15, 2009 9:10 AM To: Chris Wells; 'ce-test, qualified testing bv - Gert Gremmen'; 'Piotr Galka'; 'EMC-PSTC' Subject: RE: EMC question On 9/14/2009, Chris Wells wrote: What is the definition of a telecommunication port relative to emission testing? I understand it to be a public system as in our classic telephone system. Would a special purpose RS485 system fit this description? Hi Chris: I believe there are several versions of EN 55022 that are in various stages of phase-in and phase-out per the Official Journal. I can't recall what the details are. However, the 1998 version of EN 55022 that I have readily at hand contains the following definition of "Telecommunications Ports" in clause 3.6: "Ports which are intended to be connected to telecommunications networks (eg, public switched telecommunication networks, integrated services digital networks), local area networks (Ethernet, Token Ring) and similar networks." So, by this definition, a telecommunications network port does not necessarily have to connect to outside lines. Conventional Ethernet LANs are considered to be "telecommunication ports" within the context of this standard. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 (USA) [email protected] http://www.randolph-telecom.com <http://www.randolph-telecom.com/> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
