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<p>into smaller units and sent independently over the network. </p>

<p><big> History </big></p>
<p><a href="page.php?w=Western_Union">Western Union</a> operated a message switching system, <a href="page.php?w=Plan_55-A">Plan 55-A</a>, for processing <a href="page.php?w=telegrams">telegrams</a> in the 1950s. <a href="page.php?w=Leonard_Kleinrock">Leonard Kleinrock</a> wrote a doctoral thesis at the <a href="page.php?w=Massachusetts_Institute_of_Technology">Massachusetts Institute of Technology</a> in 1962 that analyzed queueing delays in this system. </p>

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