Book Review : The Early History of Data Network s Review by Rob Pike The Early History of Data Networks by Gerard Holzmann and Bjorn Pehrso n ISBN 0-8186-6782- 6 IEEE Computer Society Press, 291 pp ., $3 5 Some of the early builders of the Internet have been seen at recent commemorations publicly applauding each other ' s ingenuity and perseverance in solving problems in the creation of what was then called the ARPANET . Thes e congratulations are justified : the Internet is a technological marvel that deserves celebration . It is not, however , unprecedented . The celebrants might pause to consider that many of their ideas are centuries old . The first international data network was built in 1801 between Denmark and Sweden . Naturally, the two networks being joined used different coding schemes, so some gatewaying procedures needed to be developed, but the rest was i n place : national data networks were common in Europe by the turn of the 19th century . Stationed on hilltops every te n or so miles, signalers used telescopes to read the symbols displayed on huge articulated boards at the upstream station , then reproduced them
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