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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 NPA, RPBs, PPHs, police stations and police boxes are connected by an exclusive communications network. It is 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 a communications command system 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.