News Release

NII Builds the World's First Round-the-Globe Ultra-High-Speed 100 Gbps Academic Communications Network

by upgrading direct international connections of SINET to the United States, Europe and Asia subsequently to upgrading domestic connections towards Society 5.0 (*1)

National Institute of Informatics (NII; Chiyoda-ku, Tokyo; Dr. Masaru KITSUREGAWA, Director General) has expanded the international line of SINET(*2) academic information network and began operating a 100 Gbps ultra-high-speed international links in a configuration that circles the globe from Japan to the United States, Europe and back. This is the first time in the world to build an international links that goes around the globe owned by a single NREN(*3). At the same time, NII also upgraded the SINET Asia link between Japan and Singapore to the same 100 Gbps speed. These upgrades will alleviate the pressure on SINET overseas connections which had been experiencing increased transmission data volume, improve stability by making ultra-high-speed connections from two directions, Europe and the United States, and also improve relation with interconnected overseas research networks.

Background: Increase of transmission data volume over SINET international links due to the advancement of cutting-edge large-scale academic research projects and other undertakings

SINET is a communications network utilized as academic information infrastructure by universities and research organizations across Japan, and is built and operated by NII. At the launch of SINET5 in 2016, 100 Gbps ultra-high-speed lines were laid through every prefecture of Japan. Today, more than 900 universities and research organizations are connected to the network, and total volume of data transmission has increased far beyond the initial predictions made at the beginning of SINET5 operation. These increases are from higher volumes of transferred data due to the advancement of cutting-edge large-scale academic research.

SINET supports a variety of international joint research projects through interconnection with research networks in other countries/regions, and the jump in communications volume has been seen not only across domestic connections but through overseas connections as well. In particular, the direct connection between Japan and Europe established with two 10 Gbps lines three years ago is now strained due to a sharp rise in communications volume, raising concerns over the impact on research being conducted through international collaboration. Additionally, the research networks in other countries/regions have made progress with the development of 100 Gbps international connections, and NII realized the need to develop a network with an equivalent or higher speed to maintain parity between the Japanese research environment and the rest of the world. Lastly, to achieve stable operation of international connections, backup routing functions were also needed.

Upgrading SINET International Connections to Ultra-high-speed 100 Gbps and Forming a Globe-spanning Ring Topology

To address these circumstances, NII built a 100 Gbps ring connection that goes around the globe from Japan (Tokyo) to the U.S. West Coast (Los Angeles), U.S. East Coast (New York), Europe (Amsterdam) and back to Japan (Tokyo). At the same time, the Japan-Asia (Singapore) connection was also upgraded to 100 Gbps (see figure1 and table below). By adopting a ring topology that extends around the globe, the European line can be accessed via the United States and vice versa, providing a mutual backup and boosting the stability of communications. This configuration also makes it possible to distribute load and absorb fluctuations in network demand for U.S. and Europe-bound traffic. The interconnection upgrade with the pan-European GÉANT(*4) network to 100 Gbps now provides SINET's users with high capacity connectivity across Europe.

nii_newsrelease_20190301_image1_en.pngFigure1: SINET International Connection Topology Before and After Upgrades

Table: SINET International Connectivity Before and After Upgrades(*5)


Future Outlook: Contribution to International Cooperative Research and Society 5.0

This latest upgrade to SINET's international connection lines will better facilitate the international distribution of research and educational information cooperating with overseas research networks such as Internet2(*6) in the U.S., GÉANT in Europe, SURFnet in Netherlands, NORDUnet(*7) in Nordic counties and so on (see figure2). Collaborative research between Japan and the United States such as the Belle II(*8) project through the 100 Gbps connection with the U.S., between Japan and Europe such as the LHC(*9) project through the 100 Gbps connection with Europe, and between Japan and Asia through the 100 Gbps Asia connection will all be undertaken in greater depth, offering the promise of greater international cooperation and competitiveness of Japan. In addition, building mutual backup system that cooperates between international lines has been advanced, and it is expected that as global academic community, future cooperation of 100 Gbps lines will make further growth of academic network environment, which is referred to as the GREN (Global Research & Education Network). Upgrading both the domestic and international segments of the network to ultra-high-speed 100 Gbps is also expected to help accelerate the advanced fusion of cyber-space (virtual space) and physical space (real space), bringing Japan a step closer to its vision for a future society in the form of Society 5.0.


Figure2: Interconnection with overseas research networks

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NII Builds the World's First Round-the-Globe Ultra-High-Speed 100 Gbps Academic Communications Network
by upgrading direct international connections of SINET to the United States, Europe and Asia subsequently to upgrading domestic connections towards Society 5.0

(*1) Society 5.0: A human-centered society that balances economic advancement with the resolution of social problems by a system that highly integrates cyberspace and physical space. Society 5.0 was proposed in the 5th Science and Technology Basic Plan as a future society that Japan should aspire to. It follows the hunting society (Society 1.0), agricultural society (Society 2.0), industrial society (Society 3.0), and information society (Society 4.0).
(*2) SINET: Science Information NETwork. Visit to learn more.
(*3) NREN: Abbreviation of National Research and Education Network. This is a type of network established separately from the regular Internet to support research and educational institutions within a country.
(*4) GÉANT: Europe’s leading collaboration on network and related infrastructure and services for the benefit of research and education, contributing to Europe's economic growth and competitiveness. The organization develops, delivers and promotes advanced network and associated e-infrastructure services, and supports innovation and knowledge-sharing amongst its members, partners and the wider research and education networking community. Visit
(*5) KDDI Corporation supports the U.S. and the Asia connections, and NTT Communications Corporation supports the Europe connection.
(*6) Internet2: An advanced networking consortium led by the United States research and education community. It consists of a high-performance hybrid optical and packet network operated by Internet2 that is used primarily to support the research and education community with next-generation network services, as well as a platform for the development of new networking ideas and protocols. Visit
(*7) NORDUnet: the Nordic Infrastructure for Research & Education, a joint collaboration by the 5 Nordic NRENs in Denmark (DeIC), Finland (Funet), Iceland (RHnet), Norway (Uninett) and Sweden (SUNET).
(*8) Belle II: A joint international experiment using the SuperKEKB accelerator and the Belle II detector, which analyze reactions of elementary particles by collecting large volume data of e+ - e− collisions. SINET has been used to transfer the large amount of analysis data produced in the former Belle Experiment using the KEKB accelerator and the Belle Detector (which proved the Kobayashi-Maskawa theory and led to a 2008 Nobel Prize in Physics).
(*9) LHC: Large Hadron Collider. The LHC is the world’s largest proton-proton collision-type accelerator constructed by the European Organization for Nuclear Research (CERN). During the ATLAS experiment designed to discover the Higgs particle (2013 Nobel Prize in Physics), SINET was used to transfer the large amount of analysis data produced over a virtual private network called LHCONE for safe communication environment.