Bandwidth Demand: Increasing Faster than Moore's Law

The thing about technological change is that lots can change underfoot without people really noticing it. And then some point is reached where the accumulated weight of those changes causes a tipping point. And we might be watching for such a tipping point in business broadband.

You'd be hard pressed to find much widespread evidence of the trend if you look at what small businesses are buying, but if one looks at enterprises, "T1 and DS0 already starting to go away," says Pieter Poll, Qwest chief technology officer. "More and more people are preferring metro Ethernet at the high end, so low-speed private line revenue and demand is decreasing."

At some point that will start to be a bigger, or more noticeable trend within the smaller and mid-sized business market as well, simply because the bandwidth intensity of modern business and consumer applications is increasing.

Average 2007 IP traffic was over 9,000 terrabytes a day in the consumer segment, for public Internet. The average in 2012 will be over 21,000 terrabytes a day, Poll says.

Qwest itself "sees our data networks doubling traffic every 16 months," Poll noes. "That's a faster rate of increase than Moore's Law," says Poll.

"There are just more customers, more are wireless and content also is shifting to richer media," he says.

"Our residential broadband base grows traffic 39 percent annually, no matter what size pipe they buy," Poll notes.

All of which has got Qwest's planners looking for ways to grow bandwidth faster. "We are doomed over time if bandwidth demand grows faster than Moore's Law," says Poll.

So how does Qwest do that? IP directly over optical waves, where the router and the optical transmitter are all one device. Meshing the edge devices also helps, as it reduces backbone network hops, and hence bandwidth usage.

Poll also thinks major backbone providers will start swapping fiber to gain greater topological diversity and improve protection from fiber cuts.

As for his views on where the next increment of backbone bandwidth will come, Poll notes there are some carriers wanting 40 Gbps equipment, though he personally thinks running 10 Gig E waves is more affordable. Still, "that could change soon," says Poll.

The bigger issue for him is that 40 Gbps will be stranded investment when 100 Gbps equipment is available.

"My personal feeling is that 100 Gbps is the step we want," says Poll.