The Ericsson NPU3 D Controller Board is a main processing and control unit used in multi-standard radio base stations like the RBS 6402. It handles critical tasks such as baseband processing, system control, and network synchronization for 2G, 3G, and 4G/LTE technologies. Designed for compact deployments, it supports advanced features like carrier aggregation and integrated backhaul. While highly capable for its era, it is now considered a legacy component in the transition to 5G infrastructure.

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