Gary Bolton says they are first to higher speeds than vectoring. They call their system "frequency division vectoring." They claim,FDV will "double the vectored VDSL2 rate to deliver 200 – 300Mbps service rates and extend the service reach up to 40% further. I'm waiting to hear from them with more technical details.
An obvious way to do this is to use G.vector FDD line codes in lower frequencies and G.fast TDD line codes in higher. Qualcomm and Microtek have LTE chips that combine TD & FD. I don't know what it would take to do the same in DSL or whether that's Adtran's approach.
Details to come. Here's Adtran's pr