Gfast map

gfast map copy

 

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

Light Blue: Incumbent likely:  France, Germany, Italy

British-Telecom-noise-dataBT thinks the current G.fast is too conservative and the standard needs to be changed for more performance. Gavin Patterson is telling the government BT is going to deliver a gigabit. He's arguing BT shouldn't be broken up because BT is building "the best network in Europe." But his best network is running at 330 megabits while cable around the world is going to a gigabit. Comcast is about to offer a gigabit to 40 million homes. 

The order came down from the top: make it faster. The same thing is happening at AT&T. They've promised 12M lines of "GigaPower," much of which will be G.fast. But it's not a gigabit. So AT&T is leading the move for a new standard with more speed.

BT Openreach's latest update lists key developments they expect will increase speeds:

  • Increasing the maximum aggregate transmit power from 4dBm to 8dBm
  • Increasing the number of bits per tone from 11 to 15 
  • Improved use of the frequency band below 30MHz
  • Optimised frequency usage with VDSL2 
They, like many others, want to raise the limit of vectored connections from today's 16 homes to 48 or higher.
 

Ikanos's Arun Hiremath is optimistic they can deliver what BT is asking. For short loops, Ikanos is designing to 1.2 gigabit speed. These design changes should also help longer loops. Arun sees better analog engineering as crucial.

BT's decision earlier this year mostly to use existing cabinets changed the focus of the industry. Most important now  is long loop performance rather than high frequencies that don't reach very far. Non-linear precoding is necessary in the higher frequencies but not as vital at lower frequencies with reach. With no carrier interested in going to 212 MHz, coding improvements are on the back burner. 

 

BT Openreach's latest update lists key developments they expect will increase speeds:

  • Increasing the maximum aggregate transmit power from 4dBm to 8dBm
  • Increasing the number of bits per tone from 11 to 15 
  • Improved use of the frequency band below 30MHz
  • Optimised frequency usage with VDSL2 
They, like many others, want to raise the limit of vectored connections from today's 16 homes to 48 or higher