Years away, while DOCSIS 3.1 can do an upstream gigabit today. If the wireless guys think they can go both upstream and downstream on the same frequency, why can't cable? Alcatel has already demonstrated a DSL full duplex prototype. Belal Hamzeh at CableLabs believes the answer is probably yes. (Blog below.) Cable worldwide is excited, as the comments below from Australia's NBN CTO Dennis Steiger, demonstrate.
Full duplex cable won't be delivered to most customers soon, even if things go well. "If all signs remain positive, the project will transition from an innovation effort into an R&D project, open to all interested participants," Hamzeh reports. I expect it will take months even to begin the research project and more time after that for the research to yield a reliable standard. Upgrading the equipment, including the subscriber boxes, will take additional years. We all know projects like this often take longer than hoped.
Meanwhile, Verizon is winning away customers with 50 and 100 megabit upstreams. BT has begun deploying 15M lines of G.fast, also capable of hundreds of megabits. AT&T is deploying 12M lines of fiber home or G.fast. France, Spain, Korea and Taiwan are moving rapidly to G.fast and fiber home.