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PSDU and PPDU Formats
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PSDU and PPDU Formats

  • PLCP Service Data Unit
    • The PLCP Service Data Unit (PSDU) is a view of the MPDU from the
    • Physical layer.
    • The MAC layer refers to the frame as the MPDU, while the Physical layer refers to this same frame as the PSDU.
    • The only difference is from which layer of the OSI model you are looking at the
    • frame.
  • PLCP Protocol Data Unit
    • When the PLCP receives the PSDU, it then prepares the PSDU to be
    • transmitted and creates the PLCP Protocol Data Unit (PPDU).
    • The PLCP adds a preamble and PHY header to the PSDU.
    • The preamble is used for synchronization between transmitting and receiving 802.11 radios.
    • When the PPDU is created, the PMD sublayer takes the PPDU and modulates
    • the data bits and begins transmitting.
Picture
Figuree 18.13 802.11n PPDU formats

Reference:
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.

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