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On 12/16/2009 11:24 PM, Leo Bicknell wrote:
<blockquote cite="mid:20091217042435.GA31550@ussenterprise.ufp.org"
type="cite">
<pre wrap="">In a message written on Wed, Dec 16, 2009 at 07:57:58PM -0800, Michel Py wrote:
</pre>
<blockquote type="cite">
<pre wrap="">- The bandwidth on the Internet is driven by demand.
- The demand is driven by devices that connect, namely computers and now
TVs.
- The {speed | power | memory} of these devices is directly related to
Moore's law.
- Michel's law 0.9 says: "A device that is twice as fast or has twice as
much memory will consume twice as much bandwidth".
Therefore I say: there is a direct relation between Moore's law and
Internet bandwidth. Call this simple, simplified, simplistic, whatever.
And debunk it please.
</pre>
</blockquote>
<pre wrap="">
<a class="moz-txt-link-freetext" href="http://singularity.com/images/charts/SuperComputers.jpg">http://singularity.com/images/charts/SuperComputers.jpg</a>
Computing power seems to double every 1.2 years, roughly. Note
that this is loosely coupled to moore's law, but there is a
relationship.
Picking an arbitrary spot in time, in 1991 the first 14.4k modem
was introduced. That was 18 years ago, or 15 doubling cycles, at
the speed supercomputers have evolved.
14.4kbits * 2^15 is 450 Gigabits.
</pre>
</blockquote>
<br>
I'm showing 14400 * 2^15 = 471859200, which is ~450 Megabits, not
Gigabits. (Is that right?)<br>
<br>
Gigabit Ethernet hardware today costs about the same (order of
magnitude) as what 14.4k modems cost in 1991. You can even do GigE
over SMF (to achieve approximately the same distance range) for not
much more. Once we get into the question of what medium is comparable
(twisted pair copper? cat5? MMF? SMF? PSTN? DWDM?), then obviously the
question gets a lot more complicated. But as exponential doubling laws
go, I think this one holds fairly well so far. The doubling time may
not be exactly 1.2 years (I've heard 18 months), but it definitely
looks like a similar curve to me...<br>
<br>
-Scott<br>
<br>
<blockquote cite="mid:20091217042435.GA31550@ussenterprise.ufp.org"
type="cite">
<pre wrap="">
So if you could afford a 14.4K modem in 1991 which, while expensive
was something the average joe could afford. It might cost as much
as your computer at that time, you should be able to afford a
450Gigabit home connection today.
Video is a prime example. Quality has improved, but as much due
to better compression as to more bandwidth. Turns out we burn a
bunch of CPU cycles to conserve bandwidth, as bandwidth is vastly
harder to increase. It may not seem like YouTube is saving bandwidth,
but raw 1080i uncompresed video is ~1.5Gbits/sec, while YouTube has
encoded it as ~12Megabits/sec. All the CPU is going to make up for
the fact that we don't have 1.5Gbits/sec to the home.
So no, twice the speed does not equal twice the bandwidth consumed.
</pre>
<pre wrap="">
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