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When You Absolutely, Positively Need Faster Downloads
Topic Started: Mar 9 2010, 05:03 PM (94 Views)
QuirtEvans
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I Owe It All To John D'Oh
How about 322 terabits per second? How about downloading the entire Library of Congress in one second, or every movie ever made in four minutes?

http://money.cnn.com/2010/03/09/technology/cisco_internet/index.htm?hpt=T2
It would be unwise to underestimate what large groups of ill-informed people acting together can achieve. -- John D'Oh, January 14, 2010.
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Mikhailoh
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If you want trouble, find yourself a redhead
That is awesome. I'm learning a lot about Cisco stuff at work right now.
Once in his life, every man is entitled to fall madly in love with a gorgeous redhead - Lucille Ball
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George K
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Finally
Excellent. Another expansion of our basic human rights.
Edited by George K, Mar 9 2010, 05:56 PM.
A guide to GKSR: Click

"Now look here, you Baltic gas passer... "
- Mik, 6/14/08


Nothing is as effective as homeopathy.

I'd rather listen to an hour of Abba than an hour of The Beatles.
- Klaus, 4/29/18
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QuirtEvans
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I Owe It All To John D'Oh
That second link looks like a bad link. Did you mean to link to the story about people who believe access to the internet is a basic human right? Because you didn't.
It would be unwise to underestimate what large groups of ill-informed people acting together can achieve. -- John D'Oh, January 14, 2010.
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George K
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Finally
Yep. Link fixed.
A guide to GKSR: Click

"Now look here, you Baltic gas passer... "
- Mik, 6/14/08


Nothing is as effective as homeopathy.

I'd rather listen to an hour of Abba than an hour of The Beatles.
- Klaus, 4/29/18
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Axtremus
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HOLY CARP!!!
Cisco spec. sheets

OK, there is no "break through" in optical data transmission technology. The highest single-port data transmission rate is still 100 Gb/s, demonstrated with Aqua's favorite cable TV company well before the CSR-3 was introduced.

What Cisco has done is to build a small refrigerator sized box that each has 4.42 Tb/s of forwarding throughput (this itself is only a 3x improvement from the previous generation), and that's split across various combo of data transmission ports of various speeds (the highest of which is 100 Gb/s). The rest are switch fabric boxes and software to string multiple forwarding boxes into one "system" to get to 322 Tb/s overall system switching capacity.

Even with the theoretically most efficient cross-bar architecture, you'll need 2x internal switching capacity to handle 1x external throughput. Let's call that 2:1 factor the "speed-up." With the sort of multi-box architecture that Cisco needs to put together to get to 322 Tb/s, cross-bar is out of the question, and you'll need multi-stage switching to get the job done. With multi-stage switching, you'd need an even higher speed-up factor; which means if we were to hold the system throughput at 322 Tb/s, the actual internal switching capacity will be many times that. The number of boxes needed will likely be many times more than just (322/4.42).

Within one box, I would hate to speculate the number of metal layers in or the number of pins on their switch fabric PCB, and I would pity the hardware engineer who has to verify the correct working of such a beast.

So you can't get 322 Tb/s to your home, unless you get 6440 strands of optical fiber pulled into your home and two fully loaded multi-chassis CSR-3 routing systems dedicated to your home.

Despite the claim of "322 Tb/s" system design upper limit, I really doubt even Cisco has actually put together a system that is that large.

It's no small feat to build a complex system of such scale. Though I don't really see much in terms of fundamental technology breakthrough in the CSR-3. It's like going from a 100-rank 1,000-pipe pipe organ to a 322-rank 322,000-pipe pipe organ. The overall system is a lot more complicated, and you'd admire the intricacies of how all the 322,000 pipes get laid and how air gets routed to them. But it's still fundamentally the same, basic organ technology.
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