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MAC service data unit

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MSDU stands for MAC Service Data Unit.

The MSDU is that unit of data that is received from the LLC sub-layer which lies above the MAC sub-layer in a protocol stack. The LLC and MAC sub-layers are collectively referred to as the DLL.

The MSDU is received by the MAC and then either fragmented or concatenated with other recently received MSDUs to form an MPDU.

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