The earthquake and tsunami disrupted commercial power supply and caused equipment failure in approximately 1,000 exchange offices.
NTT East responded by deploying emergency batteries, emergency power generators and mobile power-supply vehicles to supply power. However, some exchange offices remained inoperable, resulting in the disruption of a total of approximately 1,470,000 circuits in telephone subscriber lines, ISDN and FLET’S Hikari (FTTH) services as of 6:00 a.m., March 13 (JST).
NTT East, with the help of other NTT Group companies and construction companies, mobilized some 5,000 people in total to make an all-out effort to restore these services. By 1:00 p.m., March 23 (JST), approximately 90 percent of the exchange offices had been restored along with the recovery of commercial power supply, leaving 93 exchange offices and approximately 155,000 circuits waiting to be restored.