In 2016, G.fast looked very promising.
But only BT & Australia's nbn remain
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: 14 October 2016 14 October 2016
Supporting 30A should win Japanese & Korean market. The biggest problem for most telcos deploying DSL is that until now, no one made a DPU with more than 16 ports. HFR of Korea has the first 24 port DPU and a giant customer ready to go. $15B SK Telecom is Korea's largest wireless carrier and #2 in fixed. There are 9M apartments in Korea served with VDSL and copper LAN, most running at 100 megabits.
Korea Telecom is actively deploying GIGA Wire, their version of G.hn, for higher speeds. They intend to upgrade 95% of those units by the end of 2017. SK needs to respond quickly. Japan is similar; millions of their "fiber" lines are fiber to the basement + VDSL. Korea and Japan used an advanced version of VDSL, using 30 MHz rather than the 17 MHz common elsewhere. Ikanos, now gone, had long been the preferred vendor. Sckipio is first with G.fast chips designed to work with VDSL 30a.
Curtis Frankenfeld of Century recently told me, "I would like G.fast to support a larger vectoring group than the current 16 ports."
For now, Century is only using G.fast in smaller buildings. They want to avoid the binder management challenges in bigger buildings. Many buildings have far more than 16 apartments, with wires in the same bundle.
To get high speeds, all the wires in the bundle have to be "vectored" to reduce noise. At G.fast speeds of 500 megabits and more, that's been a challenge. Some vendors promise to reach 48 or 96 ports with an external vectoring unit. It doesn't look like they will be available in Q4, the original roadmap.