New technologies could accelerate DSL

April 19, 2013 by Troy Wolverton

If you're a customer of AT&T's U-verse service or have plain-old DSL Internet access, you may feel like you're stuck in the slow lane, especially compared to your friends and neighbors who have cable Internet access. But you soon may be getting a speed boost.

Through a combination of existing and emerging technologies, providers starting as soon as this year are expected to increase their Internet speeds up to 100 megabits per second or more, which is comparable to the top rates offered today by Comcast and other cable Internet providers - and a lot faster than most consumers actually use today.

The difference in speeds offered by DSL providers and cable operators "is pretty big right now and is getting wider," noted Teresa Mastrangelo, an analyst at Broadbandtrends, an industry analysis and consulting firm. But she added that next-generation of DSL technologies will "help close the gap."

DSL's big boost is expected to come from two technologies called bonding and vectoring.

With bonding, a DSL provider sends signals over multiple phone lines rather than using just one. By using two phone lines to deliver DSL, rather than just one, providers can effectively double Internet speeds, industry experts say.

And they can do it fairly easily, without having to upgrade their networks or, in many cases, lay down new wire to homes. Many newer American homes already have multiple lines installed, and many older ones had second lines added in the 1980s and 1990s for things like fax machines and dedicated dial-up Internet access. In many cases, those extra lines aren't being used today and could be used to deliver higher speed Internet access.

Unlike bonding, vectoring is still in development. The technology essentially involves compensating for the noise and interference on or around . Vectoring, which is being developed by companies including Redwood City, Calif.-based ASSIA, could help boost DSL speeds to up to 100 megabits per second or more, experts say. It also is expected to greatly increase the speed at which consumers can upload data from their computers to services such as Facebook or YouTube.

Although it's not yet fully baked, vectoring already has some big backers. Deutsche Telekom, the German based telecommunication giant, announced in December that it would vector its DSL lines as part of a $7.8 billion, three-year upgrade to its wired broadband network. AT&T, which in November announced a $6 billion, three-year upgrade to its wired network, is widely expected to employ vectoring and bonding as part of that investment.

AT&T representatives declined to comment on the technology they will employ to upgrade their network.

It remains unclear whether consumers will notice or care about the upgrades. Jim Turner, a retired Menlo Park, Calif., resident, said that what encouraged him to switch his telecommunications provider from Comcast to U-Verse about two years ago was AT&T's DVR, not its Internet service. Turner, who said he mainly uses his Internet service for surfing the Web, wasn't aware of how fast his service is, but said it was adequate for what he does.

"I've been satisfied with the rate we get," he said. "I've never paid much attention to it."

DSL boosters and some analysts argue that the speed upgrades should be more than adequate to help DSL compete with cable Internet access. One thing that DSL has in its favor, they say, is that the bandwidth it promises is "dedicated," which can help DSL providers, unlike their cable rivals, offer consistent speeds.

Cable Internet customers share the bandwidth in their neighborhood with whoever might be on the Internet at the same time. That can be a problem at night and other peak periods, when multiple families in an area are watching movies from Netflix or doing other things online that require a lot of bandwidth. By contrast, with DSL, consumers have a dedicated line to a network box in their area and don't have to share any of the bandwidth available on that line.

But cable representatives note that DSL customers have to share the bandwidth being delivered to their neighborhood network box, which can also slow speeds. According to recent studies by the Federal Communications Commission, cable Internet providers do a significantly better job than DSL providers of delivering the speeds they promise, even during peak periods.

Cable representatives and some analysts say the DSL providers may have trouble keeping up, even with the new technologies coming on line. Cable engineers are developing ways to deliver speeds of up to 1 gigabit per second to consumer. Comcast says that it plans to offer speeds of up to 200 megabits per second in the near future.

" is still king in North America," said Erik Keith, who covers broadband infrastructure for research company Current Analysis. "There's no way around it."

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Apr 19, 2013
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1 / 5 (3) Apr 19, 2013
"New technologies could accelerate DSL"

I'm sure if they work hard they could squeeze a few more KB/s out of dial-up too...
not rated yet Apr 20, 2013
Not many people need gigabit speeds as long as they are getting internet at decent speeds, i think for those DSL accleration could be worth it.
not rated yet Apr 20, 2013
Obey Shannon. It's the law.

You can get any speed you want, if you bond enough lines. People have been doing that with Ethernet for years. These days, there are probably lots of unused pairs in telephone cables. The phone company might prefer to get some revenue from using them this way, than having them sit unused.
not rated yet Apr 20, 2013
Bonding has been around for quite awhile. Vectoring"...involves compensating for the noise and interference..." which sounds like what phone lines have had for a long time now. So why implement this now? Hint: Google Fiber.
1 / 5 (3) Apr 20, 2013
:\ this article doesn't really detail what vectoring is, or what bonding is. So here's a brief description:

Bonding has been around for a long while Dr_toad; usually it's been used with T1s and it'll take two synced up lines to act as a single connection to send data over. This can be beneficial because unlike doing what's called a "multilink" where layer 2 TCP syn-acks handle errors on the lines, layer 1 protocols handle it individually, reducing bandwidth-hurting latency issues.

Vectoring is essentially this: When you put an electrical signal down the line, it makes an electric field around the wire; these often interfere with other wires. The problem with DSL has traditionally been that too many signals (on neighboring wires) = too much interference -> signal loss. So account for the fields, and the ones you make with your own DSLAM (the box that distributes DSL), and overall you get less interference. Imagine all the lines working together to make a nondestructive electric field.
1.5 / 5 (4) Apr 20, 2013
^Just to elaborate on my point: I'm a network tech/engineer working for a company doing majority fiber work. I got hired because of my experience with VDSL2 (the newest tech in DSL) - it's proved fairly useful because it can get links of 25-100mbps (synchronous) to customers within 5,000 feet, without doing expensive fiber builds. Vectoring would improve this even more. Right now, VDSL2 is only capable of doing up to what's known as the 17a profile - 100mbps at best - outside of Asia; with vectoring, the 30a profile (up to 300mbps) would be released.

DSL is not dead. Do remember that while fiber is powerful, light is also only an electromagnetic wave like electrons are, just passing through a different medium. There are simply different tradeoffs for each technology.

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