Alcatel-Lucent boosts broadband over copper to 300Mbps

Copper will be able to deliver high-speed broadband while subscribers wait for fiber, the vendor said

Alcatel-Lucent has found a way to move data at 300M bps (bits per second) over two copper lines, the company said on Wednesday. However, so far it is only in a lab environment -- real products and services won't show up until next year.

Researchers at the company's Bell Labs demonstrated the 300M bps technology over a distance of 400 meters using VDSL2 (Very high bitrate Digital Subscriber Line), according to Stefaan Vanhastel, director of product marketing at Alcatel-Lucent Wireline Networks. The test showed that it can also do 100M bps over a distance of 1,000 meters, he said.

On its own VDSL2 tops out at about 100M bps over a distance of 400 meters, so to get to three times that capacity Alcatel-Lucent combines a number of different technologies. Alcatel-Lucent's first trick is to use two copper pairs at the same time, a technology called bonding. Next Alcatel-Lucent uses a feature it has developed called Phantom Mode to create a third virtual copper pair that sends data over a combination of the two physical ones.

The problem is that when you use bonding and Phantom Mode you also get a lot of crosstalk, a form of noise that degrades the signal quality and decreases the bandwidth. So instead of 300M bps you only get about 200M bps. To solve this Alcatel-Lucent uses vectoring, a technology that works like noise-cancelling headphones, according to Vanhastel. It continuously analyzes the noise conditions on the copper cables, and then creates a new signal to cancel it out, he said.

"It is a really complex technology that requires ... you to process gigabytes of signal data just to calculate the noise patterns," Vanhastel said.

Fiber to the home is the ideal long-term solution for fast broadband, and in 15 to 20 years all homes will have it, according to Vanhastel. But in the meantime operators should be able to use existing copper networks to offer faster speeds to households that don't have a fiber connection, he said.

Currently, copper is the most common broadband medium. About 65 percent of subscribers have a broadband connection that's based on DSL (Digital Subscriber Line), compared to 20 percent for cable and 12 percent for fiber, according to market research company Point Topic. Today, the average advertised DSL speeds for residential users vary between 9.2 M bps in Western Europe and Asia Pacific and 1.9M bps in South and East Asia, Point Topic said.

The use of vectoring on VDSL2 is currently being standardized by the International Telecommunication Union (ITU). The final review of the standard ends today, and if there are no further comments it will be approved by the end of April, according to Alcatel-Lucent. At the latest, it will arrive by July, according to Ericsson, which is also working on products that will support vectoring.

Alcatel-Lucent and Ericsson expect field trials using vectoring to start during 2010, and the technology will become commercially available in 2011, according to the two vendors.

Even higher speeds than 300M bps can be achieved by using more copper pairs. However, Alcatel-Lucent settled on two copper pairs because it is a more realistic scenario for when the technology is rolled out to residential users in the future, according to Vanhastel. You might find six pairs in the field, but just for businesses and maybe mobile backhaul applications, he said.

"We could have made an announcement talking about 1G bps or 2G bps, but on purpose we chose not to do that because it is not a realistic scenario," said Vanhastel.

Join the newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection

Tags Ericssonalcatel-lucentvdsl2broadband

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Mikael Ricknäs

IDG News Service
Show Comments

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Sarah Ieroianni

Brother QL-820NWB Professional Label Printer

The print quality also does not disappoint, it’s clear, bold, doesn’t smudge and the text is perfectly sized.

Ratchada Dunn

Sharp PN-40TC1 Huddle Board

The Huddle Board’s built in program; Sharp Touch Viewing software allows us to easily manipulate and edit our documents (jpegs and PDFs) all at the same time on the dashboard.

George Khoury

Sharp PN-40TC1 Huddle Board

The biggest perks for me would be that it comes with easy to use and comprehensive programs that make the collaboration process a whole lot more intuitive and organic

David Coyle

Brother PocketJet PJ-773 A4 Portable Thermal Printer

I rate the printer as a 5 out of 5 stars as it has been able to fit seamlessly into my busy and mobile lifestyle.

Kurt Hegetschweiler

Brother PocketJet PJ-773 A4 Portable Thermal Printer

It’s perfect for mobile workers. Just take it out — it’s small enough to sit anywhere — turn it on, load a sheet of paper, and start printing.

Matthew Stivala

HP OfficeJet 250 Mobile Printer

The HP OfficeJet 250 Mobile Printer is a great device that fits perfectly into my fast paced and mobile lifestyle. My first impression of the printer itself was how incredibly compact and sleek the device was.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?