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thank you for this interesting clarification. I agree with your comments and the argumentation you summarize for limiting PIE-D below 4dB. My opinion is that PIE-D is a metric not uniquely related to the pulse shape. Same PIE-D value might be associated to a huge variety of pulses and when PIE-D reaches 4dB among such IPR variety there are a consistent percentage which induce EDC to failure. The work from Robert Lingle has been quite significant in merit. Same PIE-D leads to different higher value of finite length penalty depending on the IPR considered. My experience is that experimentally I related link failure to PIE-D when it exceeded about 4dB.
Your last issue is again relevant: we do not need PIE-D as an absolute metric but we need instead PIE-D to set the percentage of the installed base which can be covered by 10GBASE-LRM. Setting PIE-D to less then 4dB reduces the coverage I guess below 60% of the last 5% worst case fibers, leading to 98% of the installed base.
Thank you for your contribution,