(Telecompaper) BT has successfully used G.fast technology to deliver a 'Cloud Radio Access Network' (C-RAN) cellular network service over copper. C-RAN is a new network architecture used to connect cellular base-stations to mobile operators' core networks. Working with US-based semiconductor manufacturer Cavium, researchers at BT's Adastral Park Labs in Ipswich demonstrated that they can use G.fast technology to deliver cellular data over copper lines at speeds of 150-200 Mbps. This removes the need for mobile operators to invest in expensive, high-capacity backhaul links over dedicated fibre connections.