But several decades ago, some smart technologists at what was then AT&T Bell Labs also told me it was "impossible" to load 40 discrete linear video channels on a single optical transmitter, as cable operators said they needed.
The point is that technological innovation often is possible where the smart guys who know the most are convinced a limit has been reached.
The important thing about 800 Mbps DSL demonstrated in the lab means 100 Mbps using DSL in the real world should be feasible, without a complete telco network upgrade to fiber-to-the-home.
And that, in turn, is crucial in part because it suggests there is a path forward for telco DSL and national broadband plans that call for 100 Mbps speeds, without capital investment that carriers would find difficult to justify.
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