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To all institutions subscribing to the SINET Academic Information Network,

This is the Academic Infrastructure Division of the National Institute of Informatics.

Thank you for your cooperation in the daily operation of the SINET Academic Information Network. We are notifying you of the following urgent planned work.

Date and Time of Work: October 19, 2025 (Sun) 12:00a.m. - 1:00a.m.
* There will be a communication outage of approximately 10 minutes within the above time frame
Location of Work: Bunkyo (Tokyo) Node
Content of Work: Emergency network equipment maintenance
Affected Scope:
- Keio University (Shinanomachi Campus)
- The University of Tokyo (Yayoi Campus)
- The University of Tokyo (Bunkyo Data Center)
- The University of Tokyo (Hongo Campus)
- The University of Tokyo (Asano Campus)
- The University of Tokyo (Institute of Industrial Science)
- Toho University (KDDI Otemachi)
- Toho University (Meguro DC)

We apologize for any inconvenience this may cause and ask for your cooperation.

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SINET Operation Center
TEL:03-3263-5804
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Period: October 19, 2025 (Sunday), 12:00 a.m. - 1:00 a.m.
Scope:

• Organizations using SINET L2VPN services via Shinanomachi
• Tonomachi Town Campus
• (Tokyo Area) Wireless WiFi connection via eduroam

Content: Emergency maintenance work at SINET Bunkyo DC
Details: One connection outage of approximately 10 minutes during the above period
Notes:

• Normal communication to both external and internal university networks will pass through a backup route, so there will be no impact.
• At Tonomachi Town Campus, the business network and wireless system will be down.