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A comment on A map of the entire internet as of May 1973. Parent comment

Re:A map of the entire internet as of May 1973 by amelius on Monday December 12, 2016 @10:10AM (#13158543)
What protocol did they used on the lowest level. E.g., what modulation scheme did they use? Did it run over the phone network? Or did they have their own cables?
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