spacer 2Telebyte Gfast Testing Guide 320

Gfast map July 2017

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

Light blue: Smaller carriers in Germany, Norway, Finland, Japan

Green: Incumbent likely:  France, Germany, & Poland  

British-Telecom-noise-dataAT&T leading the efforts for an updated standard. Field tests of current G.fast gear have seen speeds of 400-700 megabits downstream, not the gigabit promised in early pr. 400-700 is plenty for almost everyone but the marketing department is worried. Cable is going to one and two gig (shared.) Google is just one of hundreds around the world offering a symmetric gig. The engineers have marching orders: get our G.fast speeds to a true gigabit ASAP!

Fortunately, the engineers are confident they can reach a gigabit.The ITU group already is working on a second appendix to the G.fast standard, aiming for 2016. A chip CTO tells me it will be easy to do more efficient coding (non-linear precoding) and transmit more bits for a given frequency (constellation.) Those two changes he believes enough to do the trick. 

Trevor Linney of BT is running the most advanced tests of G.fast, connecting 4,000 homes. He reports "Our research shows that even more capacity can come from copper."

He also predicts more bits per tone and a lower noise floor (i.e. <-150dBm/Hz). He supports that with the test data in the illustration.  Increasing the transmit power, perhaps to 8dBm, is also under consideration. 

ITU-T agreed to specify non-linear pre-coding in an amendment to G.9701. Dong Wei of Huawei presented the data below at the excellent Upperside Conference. Interference is different at different frequencies a better coding scheme can make a large difference. Simulations show a difference of 100-300 megabits. Wei presented three different possible coding schemes, the three upper lines in the graph. Deciding on which is right for the standard can be challenging, one reason standards take time to develop. 

Bonding two lines doubles the speed, also new to the standard.

Non-Linear Precoding Huawei

 

 

 

ITU-T agreed to specify non-linear pre-coding in an amendment to G.9701. 


212 GHz and cDTA are soon shipping from Adtran. True gigabit is here. Sales takeoff is almost in sight, probably Q1 2018.
Australia confirms 1M, AT&T is ready to ramp, DT finally is moving. Omantel and Telkom South Africa are now on the map. Almost all telcos are now choosing G.fast for large buildings when they don't go FTTH. MNet Cologne and Chunghwa Taiwan have changed from fiber all the way to G.fast in the basement.

212 MHz and cDTA Are Ready: Adtran http://bit.ly/GF212cDTA
Frank Miller of Century: G.fast Will be Important to Us http://bit.ly/GFCentury

Carl Russo: Since 2007, I've Been Turning Calix Into a Software Company http://bit.ly/CalixSDN

Adtran Chosen for Australia nbn Fiber to the curb. http://bit.ly/GFnabAus

nbn looking to a million lines. This one is big. Adtran is on a roll, with DT & AT&T also looking good for 2018.

1,400,000,000 In The Works. 1.4 Gigabits http://bit.ly/GF14Gig
South Africa & Connecticut Go Nokia http://bit.ly/SouthAF

Omantel: 90% Fiber & G.fast http://bit.ly/Omantel

 

Read more ...