The main mobile operator KDDI Corp. is apologizing for the second time its network failed in as many months, after around 83,000 users in 16 prefectures in eastern Japan were unable to make calls.
The August 24 outage occurred just weeks after KDDI pledged to do everything possible to prevent a similar outage of communications services from happening again.
But this time, the outage wasn’t as serious, and the company wasn’t the only one in the spotlight.
Nippon Telegraph and Telephone West Corp., part of telecommunications giant NTT Group, also experienced network disruptions the following day, August 25, which hampered internet services.
According to KDDI, a system glitch interrupted its mobile phone services for around 45 minutes from around 9:13 p.m. on August 24, preventing users in Tokyo, Hokkaido, Niigata and 13 other prefectures from making calls, including to mobile phone services. ’emergency.
KDDI officials resolved the network outage at 9:58 p.m. that day by disconnecting the faulty equipment from its network.
The issue affected individual users of KDDI’s au-brand, UQ Mobile services, and “povo” plan subscribers, as well as businesses that use KDDI’s lines.
KDDI’s data communications services were unaffected by the latest system outage, the company said.
Meanwhile, NTT West announced on August 25 that its fiber optic internet connection services were interrupted from around 9 a.m., affecting five prefectures in the Kansai region, except for Osaka prefecture, and seven prefectures in the Tokai and Hokuriku regions.
The company said it resolved the issue at 2:44 p.m. that day.
KDDI’s latest service outage, which hit on July 2 and lasted until July 4 for more than 61 hours, affected more than 30.91 million users.
It was one of the largest telecommunications network outages in Japanese history, prompting the government to recognize it as a serious incident under telecommunications law.
The Ministry of Telecommunications issued a rare administrative directive reprimanding KDDI on August 3. He ordered the carrier to take countermeasures to prevent this from happening again.
The latter issue is unlikely to be recognized as a serious incident, as the disruptions to mobile phone services, including emergency calls, lasted less than an hour and did not affect as many users.
(This article was compiled from reports by Yoshikatsu Nakajima, Kenta Nakamura, and Takashi Yoshida.)