Layer descriptions

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