Protocol data unit: Difference between revisions

Revision as of 15:33, 29 June 2023

Revision as of 16:02, 29 June 2023

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{{Use American English|date = March 2019}}

{{Use mdy dates|date = March 2019}}

{{refimproveRefimprove|date=April 2012}}

[[Image:Pdu and sdu.svg|thumb|350px|[[Medium access control]] (MAC) layer protocol data unit (PDU) becomes [[physical layer]] [[service data unit]] (SDU).]]

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==Examples==

===OSI model===

Protocol data units of the [[OSI model]] are:<ref>{{citeCite web |url=http://www.tcpipguide.com/free/t_DataEncapsulationProtocolDataUnitsPDUsandServiceDa.htm |title=Data Encapsulation, Protocol Data Units (PDUs) and Service Data Units (SDUs) |work=The TCP/IP Guide |access-date=2012-04-05}}</ref>

*The Layer 4: [[transport layer]] PDU is the [[Packet segment|segment]] or the datagram.

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The data link layer PDU in [[Asynchronous Transfer Mode]] (ATM) networks is called a ''cell''.

{{anchorAnchor|MPDU}}

===Media access control protocol data unit===

A '''media access control protocol data unit''' ('''MAC PDU''' or '''MPDU''') is a message that is exchanged between [[media access control]] (MAC) entities in a communication system based on the layered [[OSI model]].<ref name=":0">{{Cite web |date=2006 |title=Wimax MAC-Upperlayer Services |url=http://www.comlab.hut.fi/opetus/4210/presentations/37_wimax_mac.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://www.comlab.hut.fi/opetus/4210/presentations/37_wimax_mac.pdf |archive-date=2022-10-09 |url-status=live |website=www.comlab.hut.fi |pages=12, 13, 14, 1512–15}}</ref>

In systems where the MPDU may be larger than the [[MAC service data unit]] (MSDU), the MPDU may ''include'' multiple MSDUs as a result of [[packet aggregation]]. In systems where the MPDU is smaller than the MSDU, then one MSDU may ''generate'' multiple MPDUs as a result of [[packet segmentation]].<ref name=":0" />

==See also==

* {{slinkSlink|Distributed Interactive Simulation|Protocol data units}}

* [[IP fragmentation]]

* [[MAC service data unit]]

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==References==

{{reflistReflist}}

== External links ==