ISO/IEC 30140-2:2017(E) This part of ISO/IEC 30140 provides an underwater acoustic sensor network (UWASN) conceptual model by identifying and defining three domains (application domain, network domain and UWASN domain). It also provides multiple reference architecture views consistent with the requirements defined in ISO/IEC 30140-1 (systems reference architecture, communication reference architecture and information reference architecture). For each view, related physical and functional entities are described.