The System Adaptor (SA) adapts the message and procedural communication with the SUT (System Under Test) from the abstract TTCN-3 world to the physical world of the test platform. The SA implements TRI operations and commands.
The SA is defined with three message ports:
The MAC Message port (MacMessagePort) for transmitting the MAC payload.
The MAC BC Message port (MacBCMessagePort) for messages such as DL / ULMap, DCD/UCD).
The MAC PDU port (MacPDUPort) for transmitting whole MAC messages, including header information and checksum.