February 5, 2018 by Kevin Kuo

What Does Noise Cancellation Technology and a Dramatically Improved MDU Subscriber Experience Have in Common?


Well, for those that live in mid-to-large sized MDUs being served by a service provider deploying Gfast systems and solutions, the answer to the question posed in the headline would lie in something called vectoring. This technology will play a key role in enabling service providers to reap the full benefits of Gfast. Not only from a quality of service perspective, but also in how it will redefine the performance, scalability, and overall economics of Gfast deployments around the world.

Considered to be one of the greatest technological enhancements for the copper network, vectoring has eliminated many of the issues and concerns related to using higher frequencies on twisted copper pairs. The high frequencies utilized by Gfast create strong crosstalk between neighboring copper pairs-----significantly stronger than those created by VDSL2 technology. This crosstalk takes away much of the capacity boost offered by Gfast. As a result, service providers are compelled to use vectoring to cancel this crosstalk and allow each line to perform to its potential. This noise cancellation technology allows service providers to offer higher speeds, both downstream and upstream. Vectoring also brings significant performance gains. External studies have found that when applied to VDSL2 lines, vectoring can improve performance by twofold. When used with Gfast, vectoring can improve performance by roughly tenfold which is why it is part of the standard. Gfast was initially envisioned to take advantage of vectoring since its inception so it could deliver the most optimized performance.

One challenge is that buildings come in many sizes. How helpful would it be if you could implement a “pay-as-you-grow system level vectoring” Gfast MDU solution that works in small or large buildings, event those where old wiring has historically equated to a sub-par subscriber experience? The reality of such a solution is upon us. The latest AXOS Gfast systems (AXOS E3-48F & AXOS E5-48F) allow service providers to benefit from Gfast Amendment 3 and Calix cDTA and bonding technologies to deliver symmetrical broadband speeds of up to 2 Gbps to their subscribers. These same systems support the unique ability to expand to 96 ports of vectoring (called mesh vectoring) without the need for external hardware like a VCP (Vector Control Processor) thus promoting scalability and deployment economics. With these innovations, Calix has set new standards for performance over existing service provider copper infrastructure and is leading the way in delivering unparalleled broadband experiences to all Gfast subscribers.

Go here to learn more about the disruptive innovations Calix has planned for the MDU market.