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<a accesskey="3" href="page.php?w=protocol_data_unit&amp;p=2">3.Next</a>
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<p><a href="page.php?w=Image%3APdu_and_sdu.svg">thumb</a>In <a href="page.php?w=telecommunications">telecommunications</a>, a <b>protocol data unit</b> (<b>PDU</b>) is a single unit of information transmitted among peer entities of a <a href="page.php?w=computer_network">computer network</a>. It is composed of protocol-specific control information and <a href="page.php?w=Payload_%28computing%29">user data</a>. In the layered architectures of <a href="page.php?w=communication_protocol_stack">communication protocol stack</a>s, each layer implements</p><p>
<a accesskey="3" href="page.php?w=protocol_data_unit&amp;p=2">3.Next</a>
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