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O-DU ↔ O-RU Interoperability Troubleshooting (O-RAN WG4 C/U, S & M Planes)  focuses on identifying and resolving functional and timing mismatches between the Distributed Unit (O-DU) and Radio Unit (O-RU) across the Open Fronthaul interface defined by O-RAN Working Group 4. It provides a systematic approach to diagnosing issues in the Control/User Plane (C/U), Synchronization Plane (S), and Management Plane (M)—the three pillars of inter-vendor interoperability. The guide emph