Measures to improve communications network reliability
The NTT Group has learned many lessons during past disasters that it applies to implement various measures aimed at enhancing the reliability of its communications networks. To prevent the failure of communications services during a disaster, we not only implement transmission line multi-routing, but also design communications equipment, buildings, steel towers, and other facilities to withstand disasters in accordance with predetermined standards.
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Securing critical communications
When a disaster strikes, the telephone system of the affected area is inundated with calls, causing network congestion. Under such conditions, we suppress ordinary phone traffic to secure critical communications services necessary to conduct emergency rescue and restoration operations and keep emergency number services such as 110, 119, and 118 going.
We also provide Disaster Emergency Message Dial (171) and other services as a means of checking on the safety of relatives and friends in affected areas, make our public telephones available free of charge, and provide specially installed public telephones at evacuation sites and other locations in affected areas for use by residents.
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Prompt restoration of communications services
The NTT Group stations highly mobile disaster response equipment such as power supply vehicles, portable satellite equipment, and portable mobile base stations at locations throughout the country to aid in the prompt restoration of services and securing of critical communications in disasterstricken areas. In the event of a major disaster, a disaster management headquarters and other emergency structures are also immediately set up and work to promptly restore communications services.
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Diversified disaster response assistance
NTT Group companies provide a wide range of useful disaster response systems and solutions, including services for delivering Earthquake Early Warnings and systems for organizations to contact employees and check on their safety in the event of a disaster.
UPS unit used with the Anshin Hotto ("breathe easy") service
Videophone unit for Tsunagete-Talk.
Mobile phone screen image of the emergency contact and safety confirmation system
| Name | Description | Organization |
|---|---|---|
| Tsunagete-Talk (announcement broadcasts) |
This service enables municipal authorities to use videophone (FLET'S phone series) to broadcast public announcements or report a state of emergency to local residents during disasters, and also allows communications between residents. (Available since September 2008) | NTT Advanced Technology NTT East NTT West |
| Anshin Hotto ("breathe easy") service for Hikari Denwa optical fiber telephone service | This backup power supply service uses uninterruptible power supply (UPS) units to ensure uninterrupted Hikari Denwa optical fiber telephone services even during power outages. (Available since March 2007) | NTT East NTT ME NTT FACILITIES |
| Power outage Anshin ("peace of mind") service for Hikari Denwa optical fiber telephone service | This backup power supply service uses uninterruptible power supply (UPS) units to ensure uninterrupted Hikari Denwa optical fiber telephone services even during power outages. (Available since November 2006) | NTT West NTT NEOMEIT |
| Emergency Earthquake Alert Service | This service provides immediate emergency information about earthquakes issued by the Japan Meteorological Agency transmitted through nationwide IPv6 multicast. (Full service available since July 2007) | NTT Communications |
| Emergecall emergency contact and safety confirmation system | This service enables organizations to simultaneously contact employees and check on their safety in the event of a disaster or other emergency. A new version available from February 2007 includes added functionality for the automatic transmission of earthquake and tsunami information from weather and disaster response sources to registered users. | NTT Advanced Technology |
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