Gfast map

gfast map copy


In 2016, 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

Light Blue: Incumbent likely:  France, Germany, Italy

An industry leader in test points out the key steps. Lincoln Lavoie at  the University of New Hampshire, working with the Broadband Forum, runs the model test lab for DSL. They perform the crucial interoperability testing for the Forum. Working with the Forum, they brought an interop demo to BBWF, to show the world that chips are effectively communicating with each other. 

Lavoie just published an article at Electronic Design, Best Practices for System Testing. He notes that both VDSL2 & incorporate "seamless rate adaption (SRA), bit swapping, retransmission, dying gasp, and vectoring," all of which need to be tested. Testing is also needed for features, "robust management channel (RMC), dynamic resource allocation (DRA), and fast rate adaption (FRA)." 

Using a switch, noise generator, digital signal analyzer (signal-capture system), and Ethernet traffic generator, UNH can test most of the features of the equipment.

At BBWF, they used Telebyte and Digital Lightwave for the test gear as well as equipment based on chips from Metanoia, Sckipio, and Broadcom. A half dozen "plugfests" at UNH brought the vendors closer together, although all agree there's plenty of work to do.

In the article, Lincoln describes approaches to testing bit-swapping, seamless rate adoption,  retransmission, and multi-line testing. There's also a helpful white paper from UNH.