Skip to Content
Uncategorized

The Fractal Net

AT&T breaks the code for Internet traffic.

You’re downloading a file, or calling up a Web page. Suddenly, the cyberworld goes into suspended animation.

Why can’t the Internet provide more consistent service? One reason is a lack of insight into the overall pattern of traffic on the Internet. Now, researchers at AT&T Laboratories have come up with some surprising answers to what’s going on.

If you look at a plot of traffic through a network point over a minute, the trace will fluctuate wildly from one fraction of a second to another-an expected result. Now look at a day broken up in units of 100 seconds. On a voice network, the curve flattens out; instantaneous variations cancel each other out. But on the Internet, the AT&T researchers found the pattern of traffic had the same “bursty” character over long time periods as over short ones.

Such “self-similarity”-described by a type of mathematics known as fractal geometry-occurs often in nature. A coastline, for instance, has the same jagged appearance on a large scale as on a small one. According to Robert Calderbank, vice president for information sciences at AT&T Labs, the Net’s self-similarity stems from the way people use it. Lengths of Internet sessions range over a span of 6 to 7 orders of magnitude. As a result, the flow of data on the Net resembles the mathematically complex phenomenon of turbulence.

This knowledge is allowing network engineers and service providers to rework the rules of thumb that they have used for 70 years in designing the telephone system, Calderbank says. Routers that incorporate the more sophisticated-and accurate-traffic algorithms should help data move through the Internet with fewer of those finger-drumming delays.

Deep Dive

Uncategorized

Our best illustrations of 2022

Our artists’ thought-provoking, playful creations bring our stories to life, often saying more with an image than words ever could.

How CRISPR is making farmed animals bigger, stronger, and healthier

These gene-edited fish, pigs, and other animals could soon be on the menu.

The Download: the Saudi sci-fi megacity, and sleeping babies’ brains

This is today’s edition of The Download, our weekday newsletter that provides a daily dose of what’s going on in the world of technology. These exclusive satellite images show Saudi Arabia’s sci-fi megacity is well underway In early 2021, Crown Prince Mohammed bin Salman of Saudi Arabia announced The Line: a “civilizational revolution” that would house up…

10 Breakthrough Technologies 2023

Every year, we pick the 10 technologies that matter the most right now. We look for advances that will have a big impact on our lives and break down why they matter.

Stay connected

Illustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at customer-service@technologyreview.com with a list of newsletters you’d like to receive.