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Ikanos bows NodeScale Vectoring to accelerate DSL

Mon, 10/25/2010 - 8:35am
Brian Santo

Ikanos Communications introduced a new technique that accelerates DSL significantly through the use of a method that virtually eliminates crosstalk in wires across an entire node.

The technique, which Ikanos calls NodeScale Vectoring, is based on the G.993.5 ITU standard for limiting crosstalk. Ikanos' variation will work across an entire node (approximately 384 ports), the company says, in contrast to other implementations that work across only a single line card (48 ports).

Using the technique, DSL throughputs could be improved to 100 Mbps – sufficient, the company believes, to delay the need to drive fiber to the home. It will certainly be less costly than FTTH, the company said.

The technology would not help DSL become anywhere near symmetrical, but it may be able to support upstream rates of anywhere between 40 to perhaps 60 Mbps.

The technology is currently proven in labs. Service providers are now evaluating the technology, and commercialization would follow those evaluations.

One of the challenges in deploying very-high-speed Internet access over existing infrastructure is the degradation that occurs as a result of crosstalk between coincident copper wire pairs. Each wire can often and intermittently interfere with neighboring wires, thereby introducing noise, limiting line quality and reducing VDSL performance. Other impediments, including AM radio signals, power lines, lightning and other atmospheric elements, inject even more noise into the copper network.

Ikanos' NodeScale Vectoring technology analyzes the crosstalk and interference environment in real time and creates a set of compensation signals that effectively eliminates both.

In fact, NodeScale Vectoring cancels noise across an entire network node from 192 to 384 ports or more, meeting the deployment requirements of the world's leading service providers, Ikanos says. Handling crosstalk at that level presents a massive computational challenge requiring gigabits of memory. With Ikanos' patent-pending algorithms, compression and coding techniques, service providers can deliver 100 Mbps performance at the scale necessary to support their growing subscriber bases via a cost-effective commercial silicon and software solution.

Ikanos' NodeScale Vectoring complies with the International Telecommunication Union standards group (ITU-T) G.vector standard (G.993.5), which provides for dynamic spectrum management level 3 (DSM-3) through the use of advanced crosstalk cancellation techniques.

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