This problem has been solved by VDSL2 for quite a while: http://en.wikipedia.org/wiki/Very-high-bit-rate_digital_subs... - the ratio of downstream and upstream and be configured freely there. Using VDSL2 with vectoring you can now get connections with 100 Mpbs downstream and 40 Mbps upstream in Germany.
> LR-VDSL2 enabled systems are capable of supporting speeds of around 1–4 Mbit/s (downstream) over distances of 4–5 km (2.5–3 miles), gradually increasing the bit rate up to symmetric 100 Mbit/s as loop-length shortens.
You need to be quite close to the exchange to get the higher speeds. Sounds like it should be a solution to the last mile problem though - strategically place DSLAMS along the fiber where existing copper can be re-routed to it. I have no idea how much this is done.
You need to be quite close to the exchange to get the higher speeds. Sounds like it should be a solution to the last mile problem though - strategically place DSLAMS along the fiber where existing copper can be re-routed to it. I have no idea how much this is done.