Zhao Zhiguo, press spokesman and chief engineer of the Ministry of Industry and Information Technology, explained at the press conference of the State Information Office on the 18th that by the end of March, the total number of 5G base stations had been built nationwide, the 5G user penetration rate was over 60%, the number of ports with gigabit network service capabilities reached 24.56 million, and the world's first 400G all-optical interprovincial backbone network link was officially commercialized. Everyone knows that the fastest transmission speed or highest rate in the world is 400G. We have now opened a 400G link for commercial use to better support the efficient interconnection of computing power and data elements across subjects, types, and regions.