Software unbundling could add 100 megabits to typical speeds in England. BT has just committed to 10M lines of G.fast in the next four years and "most of the country" soon after that. They are talking speeds of "up to 330 megabits" rather than the 500-800 now proven for G.fast from the local distribution point. Instead, they will put the DSLAMs in existing cabinets and save.
Cioffi, who invented vectored DSL, believes using software unbundling would allow 100 megabits faster speed. Alternatively, you can extend the reach at a given speed. Traditional unbundling shares the physical lines in the bundle. Today's technology - vectoring and G.fast - provides much higher speeds but is very sensitive to other signals in the same bundle. The incumbents are saying hardware unbundling is now undesirable. They prefer to control everything and sell bitstream access.
ASSIA's multitenant software allows multiple companies to manage the parameters for each customer and troubleshoot many problems, The carrier would manage the physical network including the vectoring noise cancellation. Each company would have a management console and could support their own customers directly.
BT's current plan is to run G.fast in frequencies from 22 MHz to 106 MHz. That leaves 0-17 MHz for other companies running older VDSL on unbundled loops. If the companies could agree that all would use the BT G.fast local loop, British homes would get 100 megabits more speed. BT would be able to use frequencies 2 MHz to 106 MHz rather than 22 to 106 MHz