Sergio, CISPR22:1998 allows in Table 4, Note 3 a relaxation of the limit by 10dB over the freq. range of 6MHz-30MHz if the common mode signal is due to the conversion by the cable of the wanted (ADSL) signal. Even when using the ISN for Cat 3 cable (ISN 50/25), I've never seen these problems. It looks like there is a serious unbalance in your circuit or within the conducted emission measuring devices. Vriendelijke Groeten, Best regards, Meilleures salutations,
Kristiaan Carpentier Regulatory and Approval Engineer Thomson multimedia Broadband Belgium N.V., S.A. Prins Boudewijnlaan 47, B-2650 Edegem, Belgium Tel: +32 3 443 6407 - Fax: +32 3 443 6632 e-mail: kristiaan.carpent...@thomson.net www.speedtouch.com From: SERGIO LUIZ DA ROCHA LOURES [mailto:sergio.lou...@siemens.com] Sent: dinsdag 2 september 2003 19:46 To: emc-p...@majordomo.ieee.org Subject: ADSL Conduct emission Dear group During a conducted emission test in an ADSL interface, we have the 1.5MHz signal and its multiples within the 0.15-30MHz range. It's a differential signal, but there is a common mode signal present. How about the CISPR limits in this case? May I ignore the ADSL signal if it's higher than the limits? Regards Sérgio L. Rocha Loures IC SC QP Q - Quality Assurance Supply Chain - Quality and Processes SIEMENS (Tel: +55 41 341-5898 ÊFax: +55 41 341-5058 <mailto:*sergio.lou...@siemens.com> *sergio.lou...@siemens.com Minha opinião e não necessariamente a do meu empregador.
