This Recommendation defines concepts of Telecommunications Management Network (TMN) architectures (TMN functional architecture, TMN information architecture, and TMN physical architectures) and their fundamental elements. This Recommendation also describes the relationships among the three architectures and provides a fi-amework to derive the requirements for the specification of TMN physical architectures fi-om the TMN functional and information architectures. A logical reference model for partitioning of management functionality, the Logical Layered Architecture (LLA), is provided. This Recommendation also defines how to demonstrate TMN conformance and compliance for the purpose of achieving interoperability.