IEC 61158-3-2:2023
Industrial communication networks - Fieldbus specifications - Part 3-2: Data-link layer service definition - Type 2 elements
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Throughout the set of fieldbus standards, the term service refers to the abstract capability provided by one layer of the OSI Basic Reference Model to the layer immediately above. Thus, the data-link layer service defined in this document is a conceptual architectural service, independent of administrative and implementation divisions.