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The Hokkaido-Sakhalin Cable System (HSCS) is a undersea cable system between Ishikari, Hokkaido in Japan and Nevelsk, Sakhalin in Russia, jointly built by TTK and NTT. The HSCS has a design capacity of 640 Gbps, with a total cable length of 500 km. And the HSCS was ready for service on July 3, 2008. With the seamless combination of the HSCS and the Europe-Russia-Asia (ERA), a trans-Russia terrestrial backbone of TTK, NTT and TTK can offer an alternative and low latency route for the traffic between Asia and Europe.