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Hi, I was reviewing the spec and the new bandwidth definition for TDECQ is not entirely clear. 1 - Obviously the measurement bandwidth (BT4 ORR) for TDECQ is still 26.5625 GHz – correct? 2 – Why do we need to capture a roll-off up to 1.3 x 53.125 GHz? This is not realistic from a hardware receiver IC point of view, neither from a T&M bandwidth point of view. Thanks, Kees MultiLane Inc 3.4 proposal: The combination of the O/E converter and the oscilloscope has a fourth-order Bessel-Thomson filter response with a bandwidth of approximately 26.5625 GHz to at least 1.3 × 53.125 GHz and at fre-quencies above 1.3 × 53.125 GHz the response should not exceed –20 dB. The normalized noise power density spectrum, N(f) in Equation (121–9), is equivalent to white noise filtered by a fourth-order Bessel-Thomson response filter with a bandwidth of 26.5625 GHz. 3.3: The combination of the O/E converter and the oscilloscope has a fourth-order Bessel-Thomson filter response with a bandwidth of approximately 26.5625 GHz. The normalized noise power density spectrum, N(f) in Equation (121–9), is equivalent to white noise filtered by a fourth-order Bessel-Thomson response filter with a bandwidth of 26.5625 GHz. From: "Mark Nowell (mnowell)" <00000b59be7040a9-dmarc-request@xxxxxxxx> Our updated D3.4 draft of P802.3cd specification has been posted in the private area: http://www.ieee802.org/3/cd/private/index.html Thanks again to the editorial team for their hard work getting this ready. We will not launch the recirculation right away to provide everyone more time to do any work they want to do to validate the specs and review the changes. Target recirc launch date is in a couple of weeks. Regards, Mark To unsubscribe from the STDS-802-3-50G list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-50G&A=1 To unsubscribe from the STDS-802-3-50G list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-50G&A=1 |