DATA LINK LAYER
MSDU – MAC Service Data Unit
Service data unit received from the Layer 3 via the LLC
MPDU – MAC Protocol Data Unit
Data unit received from the LLC. MAC header is added and packaged resulting in an 802.11 frame.
This is where the FCS is added.
PHYSICAL LAYER
PLCP – Physical Layer Convergence Procedure
Check if media is clear for transmission
PMD – PHYSICAL MEDIA DEPENDENT
PPDU – PLCP Protocol Data Unit
The complete frame. Includes PLCP headers,MAC Headers, MAC data Field. MAC and PLCP trailers
RF Energy