In 2016, G.fast looked very promising.
Thousands worked at developing and deploying.
It wasn't enough.
Most carriers are investing
in fiber or 5G instead.
Dark Blue: Firm commitments from incumbent: BT (10M), Belgacom, Australian NBN, Swisscom, Austria, Bezeq Israel, Chunghwa Taiwan, Telus Canada, Telekom South Africa, SK Korea, (U.S.) AT&T, Century, Frontier, Windstream, Belgium, Omantel
Mid Blue: Smaller carriers in Germany, Norway, Finland, Japan
- Published: 31 May 2014 31 May 2014
Years away from market. With the showmanship of a Broadway producer, Alcatel used the best cable to demo 1.1 Gbps over 70 meters. More to the point, over unshielded twisted pair they reached 500 Mbps over 100 meters under lab conditions.
They then tested with a second pair "in the binder" and discovered crosstalk dropping speeds to 60 Mbps; with vectoring, they restored the the original speed.
As cable jumps to 500 megabits, telcos are looking for answers. Suggesting a near future "upgrade path" makes vectored VDSL at 50-100 meg more tempting to operaters. One chip vendor is promising 250 meg by the end of this year but that's unlikely to be shipping gear. G.fast looks to become a standard by year end. It uses frequencies up to 212 MHz, compared to 17-30 MHz in VDSL. High frequencies attenuate rapidly, so only very short loops see performance gains.
G.fast deployment costs are the great unknown. It will require new fiber (probably expensive) but was cleverly designed not to need power lines. (It draws power from the customers connected.) One estimate is so high as to be impractical, but another thinks the cost will be manageable. One considered opinion is " In terms of cost, G.fast vectoring is probably going to be relatively close to that of FTTH because, after all, you’re bringing fiber NEARLY to the home so you’re not going to save that much. And you require some additional equipment. But you avoid entering the home, and for some operators this is crucial, and a very costly and time-consuming part of the roll-out. So that’s where you save the money. How much depends on the particular circumstances: labor costs, how much does it cost to send an engineer to a customer for 4 hours?; new buildings (with cable ducts and pre-fab walls) vs old buildings (with beautiful stone walls and no cable ducts), etc. So cost savings could be anywhere between 0 and 25%, with perhaps 10-15% a good average.
"Hundreds of papers" have been presented in the secret standards groups, probably a slight exaggeration of the actual count. Fortunately, ITU is opening up their standards to far more participants, so we'll have more data shortly. G.fast was also a prime topic of discussion at the TNO seminar on the beach at Scheveningen, pictured above. I've included the tweets from the conference below so you can pick out other hot topics.
Huawei and Alcatel are cranking out the pr on DSL but read carefully to be sure of the facts.
Sources: Tweets from the TNO DSL Conference in Schevenigan, Articles by Alcatel's Stefaan Vanhastel and Paul Spruyt http://www2.alcatel-lucent.com/techzine/the-numbers-are-in-vectoring-2-0-makes-g-fast-faster/ (strongly from the company point of view but valuable), private discussions and company pr below
Alcatel-Lucent and Telekom Austria Group complete world’s first trial of new technology enabling ultra-fast broadband over existing copper networks
A1, Austrian subsidiary of Telekom Austria Group, test Bell Labs G.fast vectoring technology, delivering speeds faster than 1 Gbps and demonstrating potential for copper in next-generation broadband access
Paris – July 2, 2013 – Alcatel-Lucent (Euronext Paris and NYSE: ALU) and A1, the Austrian subsidiary of Telekom Austria Group, have conducted the world’s first trial of an innovation from Alcatel-Lucent’s Bell Labs that can upgrade existing copper telecommunications networks into ultra-fast broadband access systems capable of delivering video, data and information at speeds of more than 1 gigabit per second (Gbps).
With Alcatel-Lucent repositioning itself as a specialist in IP Networking and Ultra-broadband access, the company has adapted Bell Labs vectoring techniques - already in widespread commercial deployment in VDSL2 networks - to work with a new transmission technology called G.fast, which use a wide frequency band to achieve very high speeds on copper lines over very short distances.
G.fast is intended for typical applications of 500 megabits per second (Mbps) speeds at 100 meters or less. In recent demonstrations and under laboratory conditions, Alcatel-Lucent achieved 1.3 Gbps over 70 meters, making G.fast a promising option for service providers to complement their fiber deployments. In any fiber-to-the-home project, a substantial part of the cost-per-subscriber is in the last few meters between the nearest network cabinet and the home. These costs can be avoided by using G.fast over the existing copper telephone line, rather than having to dig up roads or private property to install new fiber.
Bell Labs vectoring technology addresses one of the challenges related to the deployment of G.fast. In many real-world applications, such as fiber-to-the-building, the copper lines serving neighboring homes are packed closely together: this results in crosstalk interference between lines, which significantly reduces the potential speed of data transmission. G.fast vectoring removes this crosstalk, stabilizes the transmission quality and enables the technology to perform to its full potential.
• The trial, conducted with A1 and using a Bell Labs prototype, first tested G.fast over a single, good quality cable, achieving a maximum speed of 1.1 Gbps over 70 meters and 800 Mbps over 100 meters.
• On older unshielded cables, typical of most in-building cabling in Austria, the trial achieved speeds of 500 Mbps over 100 meters on a single line. However, when a second line was introduced, creating crosstalk between the two, the G.fast speed fell to only 60 Mbps.
• Vectoring was then enabled, removing the crosstalk and bringing the speed back up to 500 Mbps over 100m. This is a huge improvement over widely deployed DSL networks, which typically offer speeds of 5-30 Mbps, or VDSL2 vectoring networks supporting up to 100 Mbps. Fiber-to-the-home services typically range from 100 Mbps to 1 Gbps.
• G.fast, which is not yet standardized, won’t be commercially available for several years. However, it is a natural evolution of VDSL2 that, with the help of vectoring technology, could allow service providers to more quickly and cost-effectively provide subscribers with broadband speeds from several hundreds of Mbps up to more than 1 Gbps over short distances.
Hans Pichler, Chief Technology officer at Telekom Austria Group, said: “Telekom Austria
Group´s A1 was an early adopter of Alcatel-Lucent’s VDSL2 vectoring because we understand the value of upgrading our existing copper infrastructure to give our customers the best possible broadband service. We are pleased to be working with Alcatel-Lucent at the cutting-edge of fixed broadband technology to look at the possibilities of G.fast vectoring.”
Federico Guillen, Leader, Business Line Fixed Access, said: “As a leader in fixed broadband and a pioneer of vectoring - being the first vendor to ship 1 million VDSL2 vectoring lines - Alcatel-Lucent is ideally placed to help Telekom Austria understand the potential of G.fast and vectoring. G.fast underlines the specialist expertise Alcatel-Lucent brings to customers like Telekom Austria as they expand their footprint of ultra-broadband access coverage. While this is only a trial, the impressive results show the enormous potential of G.fast for service providers around the world.”
TNO's DSL Seminar ?@DSLSeminar2013 19 Jun
#DSLSeminar2013 has brought together experts from all over the world and we hope we grow even bigger next year
Finally TNO’s Senior consultant Harrie van de Vlag, rounds off this year’s keynotes with G.fast and an Amsterdam case study
Cable measurements above 30MHz your field? John MacDonald CEng. FIET, Specialist Technical Consultant BT, discussed today Solutions to secure vectoring introduction is the topic of Serge Eiffes, Head of Access Networks at PT Luxembourg, speaking now
We are coming up to the last few of our key note speakers and presentations it’s been a fantastic three days here
TNO’s mission is to connect people & knowledge to create innovations to boost sustainable competitive strength of industry Kenneth Schneider CEO of Telebyte is informing us today about Impulse Noise, especially in the vectoring and post-vectoring environment
Arlynn Wilson from ADTRAN discusses results on Mixed VDSL/Vectored VDSL using OSB Techniques Marc Goldburg talks about the coexistence of Vectored and Unvectored DSLs
The first discussion of today at#DSLSeminar2013 is from Brian Bogaerts, General Manager Strategic Innovation KPN, on Access Strategy at KPN
Ahmadun Nijar Zainal Abidin, Senior Researcher at Telekom Malaysia R&D will discuss implementing Vectoring/VDSL2 in Telekom Malaysia's NW
We're about to hear a Vectoring case study from Belgacom - Franky de Smet & Steve Bultynck #DSLSeminar2013
Kai Karbach Network Strategy at Deutsche Telekom just finished discussing VDSL Vectoring from Deutsche Telekom's perspective Talking now about deep dive in potentials and challenges DSL faces is Dong Wei, Senior Research Engineer @Huawei
Paul Spruyt, DSL technology strategist at Alcatel-Lucent, is now talking about best practice Vectoring in the real world
Steps towards migration from VDSL2 to G.Fast explained by Ikanos presenter Massimo Sorbara at #DSLSeminar2013
Great discussion with Kevin Foster, President of Broadband Forum, speaking about FTTdp, & G.fast technology at the
Today's chair Kevin Foster Broadband Forum President talked on Vectored VDSL2 & mitigating foreign crosstalk in unbundled loop environments
Today's final speaker is TNO's Senior Consultant, Jan de Nijs, talking about Cable networks & perspective for future broadband services
Frank van Berkel, of Reggefiber, making key notes about how Reggefiber get fibre to the home, challenges and regulation they face
Point Topic's Tim Johnson: VDSL will be the leading superfast broadband technology for Europe over the next decade
Matthias Büning, Legal and Regulatory Affairs at EWE is discussing Vectoring from a regulatory point of view now at The conference room has a splendid view overlooking the beach and the sea, an excellent setting for our social event tomorrow
First speaker of this year’s event is Scott Marcus, Director at WIK-consult, talking about the richer mix of technologies #DSL