As data is passed
through the layers and sublayers, they take on different forms. Each with different
information being added or stripped depending on the direction (up or down
through the layers.) Each of these forms will have a different name to help
differentiate them from each other.
MSDU - MAC Service Data Unit - This is
the upper layer data from L7-L3 that needs to be passed along. Technically its
actually the LPDU from the LLC that was passed along to the MAC layer thus
making it a MSDU.
- All 802.11 frames that contain data have an MSDU. But Management frames do not contain any data so they don't contain an MSDU.
MPDU - MAC Protocol Data Unit - This
is the MSDU that is being handed down to the PLCP (top sublayer in the PHY
layer)
PSDU - PLCP Service Data Unit - This
is actually the MPDU only now that its on the PHY layer its called the PSDU.
- The PLCP sublayer adds information to the PSDU and passes it along to the PMD sublayer calling that new data unit containing the PSDU and extra information a PPDU.
PPDU - PLCP Protocol Data Unit - This
is the last stop. Everything that has been passed down from L7 and encapsulated
is now ready to be transmitted.
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