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Marc thanks :-)
I have few questions for the operators (either arms of business/technical/regulatory representatives) to help me understand the situation a little bit better:
1) Do carriers think that it may not be necessary to offer Ethernet to residential market using ADSL. Could the reason be that they have invested so much into ATM/ADSL that in fact it does not make sense to change strategy at this point. In other words the ADSL volume already is so high (therefore ADSL chipset cost so low) that it would cost them more money try to introduce Ethernet over ADSL. Why mess with it when finally the inter-op is working very well and all the operational stuff with $B dollars into it is now mature
2) The other question could be regarding the performance of SHDSL: is it as good or better than ADSL. I am not sure what is real answer to this. There are two good presentations on Monday, and to a large extend the performance data depends on the assumptions on reach, binder composition, etc. So these will go thru acid test on Monday. <However from the perspective of roadmap, some new work and actual data based on DSM suggests for multi-pair operation the results are very good based on ADSL-dmt >
3) Is binder segregation allowed. Some operators may allow that, but in general my understanding is that will make it more expensive. This is at least the comments I received from some international operators. For example consider this:
a) If we assume binder segregation is allowed then what is the segregation rule. Does it mean we separate all SHDSL and T1 in the same binder (symm) and all ADSLs, and POTs in other binders. In that case the ADSL binder will outperform the SHDSL/T1 binder simply because it is wider band and has more transmit power and it does not have to deal with T1 Jammer PSD.
b) If we assume that binder segregation is not allowed then it seems to me that ADSL will dominate the composition of the binder by almost 4 to 1 and in that case we have to make simulation assumptions based on those consideration, which again I would see the results favor ADSL in more cases
Anyway I don't think there are simple answers and I will be happy to receive my answers off line.
I have also made a contribution recommending to support both SHDSL and ADSL. I think this would result to a bigger footprint for Ethernet.
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