In the latest experiment, BT revealed that downstream speeds reaching 800Mbps G.trial when using a 19 meter long copper cable. Meanwhile, for the upstream speed can reach 200Mbps. For longer cable, 66 meters, speed downstream / upstream reaches 700/200 Mbps.
The use of copper wires in this G.fast technology still continues to need development. BT revealed that the most likely new in 2015 they could commercialize the new technology.