Re: [802.3_EPOC] Questions on varanese_01_0912.pdf
Hi Marek,
Thanks a lot for the questions, please see below.
Thanks,
Andrea
From: Marek Hajduczenia [mailto:marek.hajduczenia@xxxxxx]
Sent: Friday, September 28, 2012 10:29
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx
Subject: [802.3_EPOC] Questions on varanese_01_0912.pdf
Dear colleagues,
Here are some questions on the varanese_01_0912.pdf presentation which did not get sufficient time for discussion. I'd appreciate if they were answered via reflector so that everybody benefits from these clarifications:
- How many taps have been examined in total in this study? I do not care much about names, types but rather to see what the sample size we are looking at and whether it is representative of a large network as a whole rather than a single CMT port or not.
[AG] I think it is mentioned in the slides, we have 140 subscriber (CNU) ports for the model, we considered all of them in the analysis. As you can see from the curves, since this is a model and small variability have not been included, SNR curves overlap when users are attached to same last splitter - in reality, the CDF is more continuous like shown in the measured valued, rather than step-wise. Does that answer your question?
- What is the most probably SNR distribution for a much smaller population of CNUs connects to a single CLT port? I assume that you will see some difference in SNR but it is not very likely to be as high as it was presented at the meeting for the whole measured population of taps and ports.
[AG] That may be the case, depends on how the few users are distributed in the plant. However, the question is whether this would be representative of a realistic plant - measurements are over population of ~240 modems, so it seemed to us that 140 (already smaller) was in the correct ballpark. Do you see any use case for much smaller plants, we could include in the analysis?
Please consider presenting more focused study for the next meeting, focusing on a number of drop sections to show what is expected to be seen on a single CLT port. While I am not against adaptive loading on per CLT port, I do not believe that this contribution has sufficient footing to justify adaptive loading on per CNU basis.
[AG] What we shown is one CLT port and 140 CNU ports attached for the modeled plant - for measured values, each plant is one node and ~240 CM all attached to the same coax distribution tree (Comcast may provide more clarifications in case) - we can make it more clear and improve in the next steps.
Regards
Marek Hajduczenia, PhD
ZTE Portugal
Technology Strategy Department
Edifício Amoreiras Plaza,
Rua Carlos Alberto da Mota Pinto, nr. 9 - 6 A,
1070-374 Lisbon, Portugal
Office: +351 213 700 090
Fax: + 351 213 813 349
Mobile: +351 961 121 851 (Portugal)
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