Comcast has achieved a 10Gbps “technical milestone” that can deliver gigabit-plus download and upload speeds over existing cable wires, not fiber. ZDNet reports: Comcast has achieved a 10Gbps technical milestone by delivering 1.25Gbps upload and download speeds over a live production network using Network Function Virtualization (NFV) combined with the latest Data Over Cable Service Interface Specification (DOCSIS) hardware. This is…