MAC service data unit - meaning and definition. What is MAC service data unit
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What (who) is MAC service data unit - definition


MAC service data unit         
MAC service data unit (media access control service data unit, MSDU) is the service data unit that is received from the logical link control (LLC) sub-layer which lies above the media access control (MAC) sub-layer in a protocol stack. The LLC and MAC sub-layers are collectively referred to as the data link layer (DLL).
Service data unit         
DATA PASSED DOWN TO A LOWER LAYER OF THE OSI MODEL, YET TO BE ENCAPSULATED
Service Data Unit; PSDU
In Open Systems Interconnection (OSI) terminology, a service data unit (SDU) is a unit of data that has been passed down from an OSI layer or sublayer to a lower layer. This unit of data (SDU) has not yet been encapsulated into a protocol data unit (PDU) by the lower layer.
MPDU         
UNIT OF INFORMATION TRANSMITTED BETWEEN PEER ENTITIES (AT THE SAME LAYER) OF A COMPUTER NETWORK
PPDU; MAC protocol data unit; Protocol data units; MPDU; MAC Protocol Data Unit; Protocol Data Unit; MAC PDU; Media access control protocol data unit
Message Protocol Data Unit (Reference: PDU)