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Refreshing this conversation.
Chris & any others – what do we need to get this to progress? Regards _________________________________________________________ Distinguished Engineer 170 West Tasman Dr. Enterprise Networks San Jose, CA, 95134, USA. Wrk: +1 408 525 6952 Mob: +1 408 315 8024 Email: petejone at cisco.com Web:
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_________________________________________________________ From: George Zimmerman <george@xxxxxxxxxxxxxxxxxxxx> Chris – the issue I was trying to get to on your presentation was this – In what sense is the mixing segment worst case? Specifically, please define the metric you are using to compare IL’s that differ in shape across frequency. Once you define that as a metric, we can then determine whether we agree. (also, it would be good to provide some sort of sweep of network configurations) For example, possible metrics are: The absolute minimum on the insertion loss curve? (from what frequency to what frequency?) The magnitude of the deviation from the 802.3cg insertion loss limit? Is it some frequency-integrated metric (e.g., ISI-limited SNR with some presumed fixed receive filter, matched-filter SNR (if so, it what noise), or a Salz SNR?) Since the deviation and notches in the insertion loss impact the equalization, they therefore are related to receiver assumptions – so we’d better discuss some more detail. Additionally, I wouldn’t necessarily rule out something like a small number of nodes with bad loading being a problem – so this is linked to the issue of whether we have variable inductive loading as introduced by Michael Paul… George Zimmerman, Ph.D. President & Principal CME Consulting, Inc. Experts in Advanced PHYsical Communications 310-920-3860 To unsubscribe from the STDS-802-3-SPMD list, click the following link:
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