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Infrastructures of Police Info-Communications

  Accurate communication of information is crucial for police activities. The police info-communications should never be disrupted even in a state of emergency such as huge natural disasters. In March 2011, it survived the Great East Japan Earthquake and kept its functions while private telecommunications carriers were interrupted completely.
  Police-related facilities such as the NPA, RPBs, PPHs, police stations and police boxes are connected by exclusive communications networks. They are composed of various networks such as multi-channel microwave radio lines, leased lines from private telecommunications carriers and satellite communications systems. These make police possible to operate many kinds of systems like police telephone, police radio systems, communications command systems and police information management systems throughout Japan.
  In order to make those networks more stable and reliable, the network is IP-based and has redundant circuit. In Addition, police info-communications officers keep on watching the networks and systems, and take emergency measures in case of troubles.