re: Danny - DMT vs CAP - how much further ?
As you say, this is the heart of the matter.
The estimates I have seen suggest that DMT will
go 20-40% further than CAP, at an equivalent rate.
That was certainly the order of magnitude that persuaded
Bellcore three years ago... And given that CAP is more
mature than what was then a *very* experimental DMT it seems possible.
On the other hand, in reality, there are things (eg T1 crosstalk) that
are so dominant, it is totally irrelavant which modulation scheme
you use, per se.
This is one of the reasons Rate Adaptive is so
crucial. (and an annoying thing about the strict reading
of the standard, which sabotaged free rate adaptive service)
And given enough DSP, they become identical. Throw enough MIPS and
quality analog at CAP, sure it could beat cheap DMT.
The short answer: "It depends".
We'd need a decent model, a set of test conditions, and a few days
with a decent workstation to get a real answer.
But for where we are now, with realistic engineering, I'd say the
benefit was more likely to be near 10-30% range (ie 20-70% area)
than 100 feet out 12,000
rupert |
