This document represents the second release of the DSDT Functional Architecture and supersedes Release 1. This Functional Architecture enhances the previous set of functionalities for data handling, digital twin management, analytics, and manipulation by introducing extended features and new capabilities. In addition, it introduces a new category of functions dedicated to digital twin security. These enhancements aim to address a broader set of requirements, particularly to support the development of the Network Digital Twin (NDT) as a first concrete implementation of digital twin use cases.