spacer 2Telebyte Gfast Testing Guide 320

gfast map June 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

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

Green: Incumbent likely: Belgium, France, Germany, & Poland  Country by country details. to upgrade 3M/year. Kevin Foster of BT minced no words. " must deliver speeds over longer distances ~ 350m (0.5mm Cu.)" BT's original plan was to support from 4M distribution points, for speeds of > 500 megabits. The finance guys decided to go only to the neighborhood cabinets, requiring 95% fewer installations and minimal new fiber. That raised the typical loop length from 35 meters to 350 meters.

To get even the lowered speeds (~300 megabits) at 350 meters is pushing the state of the art. The change in requirements has delayed most work from early this year to end of this year. The tests are going well to over 4,000 homes, at least at short distances.

Kevin thinks it can be done. He believes engineers can:

  • Enable higher bits per tone
  • Improve the receiver sensitivity (noise floor)
  • Increase the transmit power
  • Optimise the frequency usage with VDSL ? Increased vectoring group sizes ? 

Rami Verbin of Sckipio saw the same possibilities in an interview last June. Some of them should be close to delivery by now. Foster also demanded " units must have a higher DPU port density (typically 48/96 ports.)" Fortunately, Huawei tells me they expect a 96 port unit late this year. Alcatel should be on par with them. 



Subscribe to our Newsletter

BT: performance "pretty much spot on"
DSM Could Increase Speeds 25-50+ Megabit
DT: No 35b VDSL before 2018, modems not available
AT&T confirmed (unofficially.)
Andrew Ferguson: DSLAMs can be different
Energia Selling Nokia in Japan
Calix Clobbered by Services Cost
Switzerland: We're going; Forget fiber home except in new builds 
Nokia takes XG-FAST to 8 gig in the lab at nbn 
Huawei jumping in to G.faster 
Paris Summit 2017 9 to 11 May will be a great show
100,000 modems sold by Technicolor - running VDSL Australia: 
700,000 "FTTdp homes." Should use but may go VDSL. 
Tens of millions lines predicted 
"Study" predicts $200/line chip price in 2022 !? 

Read more ...