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In [[telecommunication]]s, the term '''protocol data unit''' ('''PDU''') has the following meanings:
<b>1.</b> [[Information]] that is delivered as a unit among peer entities of a [[computer network|network]] and that may contain control information, [[address]] information, or [[data]].
<b>2.</b> In layered systems, a unit of data that is specified in a [[communications protocol|protocol]] of a given [[layer]] and that consists of [[protocol-control information]] of the given layer and possibly [[user]] data of that layer.
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