Ethernet usually does not connect to telecommunications outside plant/serve 'off premises' equipment. Hence 'Intra-building' surge can be applied to the ENET lines. AC power cross does not apply for Intra-building cable connections. [Also, If you use shielded cable and ground at both ends - Intrabuilding surge does not apply.] Intra-building surge for ENET is possible, if using non-shielded cable. Andy
____________________________________ Andy White, Staff EMC Engineer Ericsson Wireless Communications Inc. San Diego, CA 92121 Tel 858 332 6214 / 877 877 7799 ext 26214 Fax 858 332 7311 e-mail andy.wh...@ewu.ericsson.se ____________________________________ -----Original Message----- From: Muhammad Sagarwala [mailto:msa...@force10networks.com] Sent: Monday, July 22, 2002 3:21 PM To: emc-p...@majordomo.ieee.org Subject: NEBS compliance for 100baseT / 1000base T Hello Gurus, I am new to this list so pardon me if my questions sound naive. The question I had was, for nebs compliance we need to pass power cross and lightening tests. For boards with copper ports (100baseT and 100base T), is it possible to use rj45 connectors with integrated magnetics and still get pass these tests. Has anybody done that - if yes, is it possible to share the method. I believe there are components (e.g. sedactors) one can use, but those are capacitve and might impact the signal integrity. Also, mostly that kind of stuff is used on the line side of the transformer. I am just a little bit hesistant to put in on the secondary side... Any input would be highly appreciated... Thanks Muhammad
