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VDSL2-based tech achieves 0.5Gbps data rate

Posted: 20 Mar 2009     Print Version  Bookmark and Share

Keywords:broadband communications  VDSL2  copper lines  data rates 

Ericsson is claiming a major breakthrough in broadband communications after the communications equipment company demonstrated VDSL2-based technology that can achieve data rates of 500Mbps over multiple copper lines, five times faster than is theoretically possible with existing VDSL2.

This is also about 30 or 40 times faster than the actual data rate achieved by most users in Europe using copper-based technologies such as the existing prevalent ADSL2.

Ericsson said the new technology is suitable for fibre extensions, combining fibre and last-mile copper for backhauling. It opens up new possibilities for the delivery of HDTV and video-on-demand over IPTV networks.

The new crosstalk cancellation or "vectorised" VDSL2 technique improves performance by reducing the noise coming from other copper pairs in the same bundle. This increases both capacity and reach, meaning that more customers would be served.

The company said that the products based on the technology could be made available by the end of this year, coinciding with industry efforts to standardise the technology. Standards for VDSL2 and line bonding are already available.

Initial applications would be multi-dwelling units or other areas where there is both a proliferation of copper lines and a short reach for the DSL line. The resulting bandwidth, however, could support IPTV and many other video applications, in addition to broadband Internet access and telephone service.

Ericsson's lab demonstration of the 0.5Gbps technology was only over a relatively short distance of 500m and was achieved by bundling six lines (twisted pairs) into one.

Of course it will be difficult to achieve these data rates in the real world because, for instance, few existing homes have six lines. However, Håkan Eriksson, chief technology officer at Ericsson, said the demonstration "confirms Ericsson's leadership in broadband access technology and our commitment to the continued R&D of DSL technology to improve operators' business with new access solutions."

The company added that the vectorised VDSL 2 technology also makes it possible to use existing copper networks as a backhaul for radio base stations, accelerating future rollout of HSPA and LTE-based wireless broadband.

The new technology works by reducing noise originating from the other copper pairs in the same cable bundle. This increases capacity and reach, boosting the number of customers that can be connected.

Vectoring technology also decouples the lines in a cable (from an interference point of view), substantially improving power management, which can reduce power consumption.

- John Walko
EE Times Europe





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