# MAC service data unit

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**MAC service data unit** (**media access control service data unit**, **MSDU**) is the [service data unit](/source/Service_data_unit) in the [IEEE 802](/source/IEEE_802) reference model of network architecture. This data unit is exchanged at the interface between the [media access control](/source/Media_access_control) (MAC) sub-layer and the layer immediately above it, typically the (optional) [logical link control](/source/Logical_link_control) (LLC) sub-layer.[1][2] The LLC and MAC sub-layers are collectively referred to as the [data link layer](/source/Data_link_layer) (DLL).

## See also

- [MAC protocol data unit](/source/MAC_protocol_data_unit)
- [Packet segmentation](/source/Packet_segmentation)
- [Packet aggregation](/source/Packet_aggregation)

## References

1. ["MAC Service Data Unit (MSDU)"](https://onlinedocs.microchip.com/oxy/GUID-4B3D771E-5647-4191-AD45-C897B0D23071-en-US-3/GUID-5B9485C1-5782-4C12-BC46-70914B0DFBC8.html). [Microchip Technology](/source/Microchip_Technology). Retrieved 2024-03-12.

1. ["MAC Service Data Unit (MSDU)"](https://support.accessagility.com/hc/wifi-glossary-msdu). Access Agility. Retrieved 2024-03-12.

## External links

- [802.11 Wireless LAN IEEE standard](https://web.archive.org/web/20051102045243/http://standards.ieee.org/getieee802/download/802.16-2004.pdf)
- [Protocol Data Unit (PDU) / Service Data Unit (SDU)](http://www.patrickdenis.biz/blog/protocol-data-unit-pdu-service-data-unit-sdu/)

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Adapted from the Wikipedia article [MAC service data unit](https://en.wikipedia.org/wiki/MAC_service_data_unit) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/MAC_service_data_unit?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.