Until now, only coax allowed individual speeds to be modified. G.fast allows changing the downstream/upstream ratio from 90/10 to 10/90. While most of the time higher downstreams are better, Sckipio has demonstrated 750 up. Before DTA, you could only deliver at a fixed ratio to all the customers connected to a DPU; the first DTA systems, from Adtran and Calix, only worked on low-interference lines, either coax or an isolated pair of phone lines. In Booth 20D at BBWF, Sckipio and Calix will have a live demo of Collective dynamic time assignment, their name for DTA over twisted pair in a typical binder. I have unofficially seen some test results; they look good.
When I first saw DTA, I immediately knew why I wanted it. I need faster upstream because we're backing up terabytes of Jennie's video footage to Amazon's unlimited cloud. At $55/year, that's a great deal. I've spent two months so far at Time Warner's top speed of 20 megabits, 200 down. I'd much rather have 75/75, but FiOS doesn't come to my building. If we had 500 megabits from fiber to my basement, I could have 100 down and 400 up. If my neighbor installed 12 virtual reality headsets for gaming friends, she might prefer 400 down, 100 up. (Wish I had the speed today.)
Rami Verbin of Sckipio told me a while back he was working on this, but I didn't expect it to be working so soon. It requires brilliant mathematics for signal processing and state of the art electronics.