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Originally Posted by mswhin63
The one thing I found lacking is a bit more specific allocation of resources. ie: are they going to upgrade dial-up first before ADSL2+ or are they going to leave difficult locations till it is forgotten about.
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Hi Malcolm,
Announcements were made for the first and second release sites here -
http://www.nbn.gov.au/follow-the-rol...nland-rollout/
and they have said they finalizing a detailed rollout for all locations in Australia.
It is important to keep in mind that the NBN is not simply an Internet delivery
network. When many people hear the word "broadband" they relate it to mean
a fast Internet connection. However, is also replacing the entire switched
telephone network infrastructure. The network terminating device that will
be installed on your house will still have a phone socket outlet so that you
will still be able to plug in your existing phone handsets and dial a number like
you do today, but the old switched network structure will be ripped out and
gone forever. With this in mind, there will be limited incentive to have islands
of old switched telephone exchanges as it will be more difficult to maintain.
Though there has been some prioritizing for getting the NBN to some areas first,
when you consider the scope and dimension of the project where they plan
on bringing fiber to something like 6000 house per day over the next decade,
the logistics won't simply pan out to upgrade those areas with dial up
Internet connections first, but instead, as the NBN web site itself puts it
succinctly, "For a project of this size and complexity, it is important to get the planning
and design phases right to ensure that the rollout occurs as efficiently as possible".
When one considers the enormous distances involved, spanning optical
fibers across the country between every town and city and the fact that it is
changing the entire communications backbone of the continent, not simply
providing an alternative to ADSL or ADSL2, then it becomes easier to appreciate
the deployment probably borrows more from the logistics of an enormous
military campaign rather than just casual, piecemeal deployment.
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The presentation was more suited to engineering audience though. Interesting that it talks about new technology in modulation. I have worked with 16QAM and 16OQPSK NRZ microwave link system almost 20 years ago and the next systems to be brought in before I left were higher than that. This presentation suggests the technology is only in it infancy.
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Not quite ... I think you will find that Ferris, who is well versed in the engineering,
in this context is primarily alluding to the use of methods such as QAM at optical
wavelengths on fiber. So he is not saying QAM is in its infancy, instead, as he says
at 28:44 "so as the radio guys have been investing in technology and going through and
working through an analogue medium to gain the most they possibly can out of the radio
spectrum, the optics guys have looked at that and said 'hey, hang on. That looks
pretty good. We might try a bit of that OFDM. What about this QAM? We could try
a bit of analogue across that.'" In other words, whereas techniques such as QAM
have been around a long time in radio, only in recent years have researchers started
to apply them optically, which requires a different bag of tricks.