ISO/IEC 24791-5:2012 defines an interface within the Software System Infrastructure (SSI) that provides RFID system control components with low-level access to RFID interrogators for the purpose of optimizing RFID data access and control operations. This interface is designed to be modular with the ability to support multiple RFID air protocols. However, in ISO/IEC 24791-5:2012, the only RFID air protocol supported is Type C of ISO/IEC 18000-6.