Vendors closing in on 1Gbps using DSL

The combination of a number of technologies will boost DSL speeds, but only over short distances

DSL vendors are using a variety of methods such as bonding several copper lines, creating virtual ones and using advanced noise cancellation to increase broadband over copper to several hundred megabits per second.

At the Broadband World Forum in Paris, Nokia Siemens Networks became the latest vendor to brag about its copper prowess. It can now transmit speeds of up to 825M bps over a distance of 400 meters, it said on Monday.

However, the company isn't alone in wanting to tell about the kind of speeds next-generation DSL (Digital Subscriber Line) systems can achieve. Last week, Huawei said it can transmit 700M bps over the same distance. Today, Alcatel-Lucent said it has achieved 910M bps in its latest round of tests over 400 meters, according to a spokesman.

To boost DSL to those kinds of speeds, the vendors are using a number of technologies. One way is to send traffic using VDSL2 (Very high bit-rate Digital Subscriber Line) over several copper pairs at the same time, compared to traditional DSL which only uses one copper pair. This method then uses a technology -- called DSL Phantom Mode by Alcatel-Lucent and Phantom DSL by Nokia Siemens -- that can create a third virtual copper pair that sends data over a combination of two physical pairs.

However, the use of these technologies also creates crosstalk, a form of noise that degrades the signal quality and decreases the bandwidth. To counteract that, vendors are using a noise canceling technology called vectoring. It works the same way as noise-canceling headphones, continuously analyzing the noise conditions on the copper cables, and then creates a new signal to cancel it out, according to Alcatel-Lucent.

To get really high speeds vendors are using four copper pairs, which will not be readily available among broadband operators. A more realistic scenario is using two copper pairs, which can still boost the bandwidth to 390M bps over 400 meters, according to the latest tests done by Alcatel-Lucent. In general, vectoring can bring significant advantages at distances up to 1,000 meters, Alcatel-Lucen said.

ZTE is taking an even more cautious approach, and said on Friday it can reach 100M bps using VDSL2, vectoring and one copper pair over 300 meters.

Products are now entering field trials and operators will be able to start using them in commercial services during next year.

Copper is still the most common way of carrying fixed broadband, with a share of about 65 percent, compared to 20 percent for cable and 12 percent for fiber, according to market research company Point Topic.

Fiber all the way to the home is the ideal long-term solution for fast broadband, but the new technologies will help operators offer faster speeds using copper as fiber coverage is expanded over the coming decades, vendors agree.

Send news tips and comments to mikael_ricknas@idg.com

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags broadbandNetworkingtelecommunicationalcatel-lucentEricssonZTEDSLNokia Siemens Networks

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

Cool Tech

Bang and Olufsen Beosound Stage - Dolby Atmos Soundbar

Learn more >

Toys for Boys

Sony WF-1000XM3 Wireless Noise Cancelling Headphones

Learn more >

ASUS ROG, ACRONYM partner for Special Edition Zephyrus G14

Learn more >

Nakamichi Delta 100 3-Way Hi Fi Speaker System

Learn more >

Family Friendly

Philips Sonicare Diamond Clean 9000 Toothbrush

Learn more >

Mario Kart Live: Home Circuit for Nintendo Switch

Learn more >

Stocking Stuffer

SunnyBunny Snowflakes 20 LED Solar Powered Fairy String

Learn more >

Teac 7 inch Swivel Screen Portable DVD Player

Learn more >

Christmas Gift Guide

Click for more ›

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Pope

Dynabook Portégé X30L-G

Ultimately this laptop has achieved everything I would hope for in a laptop for work, while fitting that into a form factor and weight that is remarkable.

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?