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SATNET
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<p>SATNET, also known as the Atlantic Packet Satellite Network, was an early satellite network that formed an initial segment of the <a href="/facts/Internet/Xw1rVvJU">Internet</a>. It was implemented by <a href="/facts/BBN_Technologies/9kA7axL3">BBN Technologies</a> under the direction of <a href="/facts/Advanced_Research_Projects_Agency/Uf9sarhT">ARPA</a>. </p><p>The first heterogeneous computer network was implemented in 1973, connecting the <a href="/facts/ARPANET/LyMGWurJ">ARPANET</a> to <a href="/facts/University_College_London/7dmHhCf5">University College London</a>. This evolved into SATNET. The first <a href="/facts/Transmission_Control_Program/Qq6VeEal">Transmission Control Program</a> demonstration, linking SATNET, the ARPANET, and <a href="/facts/PRNET/wG1pThTW">PRNET</a> took place on November 22, 1977. </p>