[opendtv] Re: FCC issues net neutrality rules in face of Congress and carriers
- From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 24 Oct 2009 18:28:38 -0400
Tom Barry wrote:
> Sorry, I don't follow your reasoning here. Why does
> 100 people uploading 100 mbps each take more cable
> resources than 100 people downloading 100 mbps each?
If the question is, "does it cost more to offer 100M down and 100M up than it
does to offer 100M down and 1M up?" The answer is obviously yes. In these
cases, that is.
Perhaps you wonder whether 1M up and 1M down to every household costs the same
as, say, 100M down and 300K up? If it did, would you prefer that 1M symmetric
service?
These cable HFC or FTTH (like FiOS) are all passive systems. They have a
certain amount of bandwidth assigned to downstream capacity (obviously
aggregated, one source to multiple destinations) and a certain assigned to
aggregated upstream, for all of the homes "passed" by the passive portion of
the network.
So, with a fixed downstream amount, the more you assign upstream to each home,
the wider that passive network bandwidth will have to be.
The same thing happens with the xDSL and radio variants. The systems are also
full duplex for each drop, with a certain amount of bandwidth dedicated to
downstream and a certain amount of non-interfering bandwidth dedicated to
upstream. For a given amount of downstream capacity, the more you assign to
upstream, the wider the bandwidth on the copper twisted pair or radio link will
have to be, to each household. And that costs more.
Bert
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