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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.
Best Regards
Behrooz
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