If there are, we won’t find them for a long time. Consider this: installation of the copper cables that currently provide the bulk of UK Internet services began over 120 years ago. Although there have been significant developments in allowing copper to carry data, it was never designed to do so. Dial-up allowed up to 64Kb/s, ADSL allowed up to 8Mbps, ADSL 2+ up to 24Mbps, and finally VDSL 2+ which managed up to 40Mbps on a single copper line from the cabinet on the street. Fibre has only been around for a short time and can already handle speeds of 10Gbps. It will be a long time before we find its limit.
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