DSL on the Road to Gigabit – Industry Snapshot at Huawei


DSL technology has been in use for over a decade, and with every year it appears to reach greater lengths and require more bandwidth thanks to bandwidth-intensive applications such as HDTV. Huawei meets this challenge with Giga DSL (a next-generation single-twist DSL access technology), for which the prototype arrived in December 2011. Offering uplink and downlink speeds of 1 Gbps within a radius of 100 meters, this technology has the viability of keeping copper resources fully utilized. over the next decade.

Huawei Advanced Access Senior Scientist Dr Long Guozhu introduces Huawei’s Giga DSL prototype, while offering his perspectives on the development and application of copper.

Dr Long believes that, over fiber and other access media, the main advantage of copper is its low cost, a key factor in network deployment. Vectorization, for example, requires the cancellation of crosstalk, resulting in complex deployments and increased costs, while G.fast requires extensive bandwidth, resulting in increased complexity and lower efficiency. Huawei’s Giga DSL prototype uses a technology called TDD (the G.fast element agreed to by the ITU), as opposed to the FDD technology used by VDSL2 and ADSL, which helps reduce the complexity of network deployment.

Using legacy copper via new DSL technologies is now a very efficient route to broadband. Tests with several major carriers show that using 0.5mm copper, Huawei’s Giga DSL prototype delivers uplink / downlink speeds of 550 Mbps at less than 200 meters and up to 1 Gbps at less than 100 meters. In the future, other technologies may coexist with the Giga DSL, and their cross-line crosstalk, neutralization, and other relevant issues will require continued industry attention on the research front.

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