MAC service data unit: Difference between revisions

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{{NotabilityContext|date=JulyMarch 20102024}}

'''MAC service data unit''' ('''media access control service data unit''', '''MSDU''') is the [[service data unit]] in the [[IEEE 802]] reference model of network architecture. This data unit is exchanged at the interface between the [[media access control]] (MAC) sub-layer and the layer immediately above it, typically the (optional) [[logical link control]] (LLC) sub-layer.<ref>{{cite web |url=https://onlinedocs.microchip.com/oxy/GUID-4B3D771E-5647-4191-AD45-C897B0D23071-en-US-3/GUID-5B9485C1-5782-4C12-BC46-70914B0DFBC8.html |title=MAC Service Data Unit (MSDU) |access-date=2024-03-12 |publisher=[[Microchip Technology]]}}</ref><ref>{{cite web |url=https://support.accessagility.com/hc/wifi-glossary-msdu |title=MAC Service Data Unit (MSDU) |access-date=2024-03-12 |publisher=Access Agility}}</ref> The LLC and MAC sub-layers are collectively referred to as the [[data link layer]] (DLL).

'''MAC service data unit''' or '''MSDU''' stands for [[medium access control]] [[service data unit]].

The MSDU is the service data unit that is received from the [[logical link control]] (LLC) sub-layer which lies above the medium access control (MAC) sub-layer in a [[protocol stack]]. The LLC and MAC sub-layers are collectively referred to as the [[Data Link Layer|DLL]].

[[File:Pdu and sdu.svg]]

==See also==

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* [[Packet segmentation]]

* [[Packet aggregation]]

==References==

{{Reflist}}

== External links ==

* [https://web.archive.org/web/20051102045243/http://standards.ieee.org/getieee802/download/802.16-2004.pdf 802.11 Wireless LAN IEEE standard]

* [http://www.patrickdenis.biz/blog/protocol-data-unit-pdu-service-data-unit-sdu/ Protocol Data Unit (PDU) / Service Data Unit (SDU)]

[[Category:Media access control]]

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