It is critical that communications are secured as they are important in saving people’s lives, such as the communications
necessary for maintaining public order and for rescue and restoration operations at times of disasters, and for emergency
communications, such as 110, 118, and 119. Japan is a country prone to natural disasters such as earthquakes and typhoons.
The importance of telecommunications networks was reaffirmed by the devastating Great East Japan Earthquake.
Facing the possibility of an earthquake directly underneath Tokyo or the Nankai Trough off Japan’s southern coastline, there is a pressing need for society to prepare for such potential disasters while ensuring the stability and reliability of its telecommunications infrastructure.
NTT Group has defined three key themes for disaster countermeasures: securing critical communications, prompt restoration of services, and improving network reliability. We have been strengthening efforts based on these themes since the Great East Japan Earthquake.
Specifically, we are taking measures to improve the reliability of our telecommunications infrastructure. To ensure that our communications services operate without interruption at all times, we employ transmission trunk line multirouting, have enacted blackout countermeasures for communications buildings and base stations, and are making communications buildings more quake-proof. In addition, we are expanding the assortment of power supply vehicles and other disaster response equipment that we have positioned throughout Japan, and are repeatedly conducting trainings to prepare for major natural disasters. We are making a daily effort to guarantee that, in the event of a disaster, we are able to immediately set up a Disaster Countermeasures Office and other emergency structures and make the necessary emergency and critical communications as designated public institutions prescribed in the Basic Act on Disaster Control Measures.
In fiscal 2017, two major accidents occurred at the four telecommunications businesses (NTT East, NTT WEST, NTT Communications and NTT DOCOMO), and service stability was 99.99%.