Can Achieve Access Rate of One Gbps per Twisted Pair
[Shenzhen, China, December 14, 2011]: Huawei, a leading global information and communications technology (ICT) provider, today announced that it successfully launched the industry’s first Giga DSL (Digital Subscriber line) prototype. The Giga DSL system employs time division duplex (TDD) to achieve a total upstream and downstream rate of 1,000 Mb/s over a single twisted pair.
In order to address obstacles related to limited bandwidth of FTTB (Fiber to the Building)/FTTC(Fiber to the Curb) and difficulty in deploying FTTH (Fiber to the Home) drop cables – so that users can enjoy bandwidth-hungry services such as IPTV and HDTV – optical fiber access points need to be located closer to users. While, 100 Mbp/s-plus ultra-broadband access can be made available relatively quickly by utilizing legacy copper line resources, providing 1,000 Mbp/s bandwidth within 100 meters of twisted pairs using DSL technology is more complex.
By using low-power spectral density in-signal transmission, Huawei’s Giga DSL prototype reduces radiation interference and power consumption, and provides a total upstream and downstream rate of one Gb/s within 100 meters, and 500 Mb/s-plus within 200 meters – making it a cost-effective option for telecom operators building ultra-broadband access networks.
Giga DSL is a next-generation access technology solution that growing quickly. In 2011, ITU-T set up a G.fast project team dedicated to formulating new standards for ultra-speed access at short distances, the aim being to achieve 500 Mb/s access rate per twisted pair within 100 meters. Huawei has actively participated in the work of the team and has become a major technical contributor, having recently worked to incorporate TDD-OFDM (Orthogonal Frequency Division Multiplexing) as a G.fast modulation mode.
Dr. Long Guozhu, Huawei’s Principal Expert of DSL technology, said, “Huawei has taken the lead in developing a Giga DSL prototype because of our rich capabilities and industry-leading technical strengths in access networks. It was inevitable that spectrum expansion would help us improve the rate of a twisted pair at a short distance, but after the spectrum is expanded, a technical issue appears: how to design the high-speed physical layer and high-frequency analog front end (AFE). To tackle this issue, Huawei’s FBB Innovation Lab used the core solution TDD-OFDM, which simplifies the physical-layer architecture and the AFE design, while at the same time makes it possible to be downward compatible with traditional ADSL/VDSL2 technologies.”
Huawei also recently announced the successful development of the world’s first node level vectoring (NLV) prototype. Huawei’s vectoring product provides 100 Mbps access over a single twisted pair in FTTC/FTTB, and has been tested and commercially trialed with many leading telecom operators. This, along with the company’s latest prototype, Giga DSL, signifies that DSL technology still has great potential to meet the requirements of broadband users for ultra-high-speed access in the future.
Huawei’s advances within Giga DSL will enhance the capabilities of the company’s SingleFAN broadband access solution. Its SingleFAN solution and related offerings are now servicing over one third of the world’s broadband users with ultra-broadband access services.