Nationwide Network topology

The network topology of SINET3 has 63 edge nodes and 12 core nodes, i.e.,75 layer-1 switches and 12 IP/MPLS routers. The line speed between the edge and core nodes is 1 to 20 Gbps, and the backbone line speed between the core nodes is a maximum of 40 Gbps. The network deploys Japan's first STM256(40Gbps) lines between Tokyo, Nagoya, and Osaka. The backbone links form three loops to enhance network resiliency natiomwide and to enable quick service recovery after network failures. The topology also enables efficient use of network bandwidth by sharing backbone links among users for all services.

International Network Collaboration

SINET3 is also connected to research networks such as Abiline in the U.S. and GEANT in Europe to facilitate the international dissemination of research information and to promote collaboration with research networks overseas.