SJC2 submarine cable (Southeast Asia-Japan Cable 2)

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The invisible infrastructure of global connectivity

SJC2 (Southeast Asia-Japan Cable 2) is the most powerful intra-Asian submarine cable system of the current generation. It connects Singapore with Japan via Vietnam, Cambodia, Thailand, Hong Kong, Taiwan, South Korea and China and, at 144 Tbit/s, offers five times the capacity of its predecessor SJC. The cable went into operation in July 2025. SJC2 sets new standards for intra-Asian data traffic with eight fiber pairs and 400 Gbps DWDM technology. It also opens up Cambodia for the first time with its own submarine cable landing point, significantly improving the connectivity infrastructure of the entire ASEAN region.

Route & connection

SJC2 connects Singapore with Shima (Japan) via Vietnam, Cambodia, Songkhla (Thailand), Hong Kong, Toucheng (Taiwan), Geoje (South Korea) and several landing points in China. In total, the system comprises eleven cable landing stations in nine countries and territories. The total length is around 10,500 kilometers

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SJC2 submarine cable

Technology & capacity

SJC2 was supplied entirely by NEC Corporation as a turn-key supplier and features eight fiber pairs with the latest 400G DWDM wavelength technology.

8 fiber pairs: 144 Tbit/s total capacity (45 wavelengths × 400 Gbps per fiber pair)
400 Gbps DWDM: The latest coherence technology for maximum data throughput
Cambodia’s first connection: first ever submarine cable landing point for the country
5 times the capacity of SJC: massive leap in capacity for the entire intra-Asian region

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Provider Overview

SAVECALL as access to SJC2

SJC2 is the most modern and powerful APAC cable system in operation. It is a system that requires direct market access to avoid relying on reseller pricing and off-the-shelf products. SAVECALL has the partnerships, market understanding and negotiating experience to source capacity on SJC2 directly and at competitive rates. We understand the technical differences with SJC and APG and can recommend the right combination for your specific site mix. For companies looking to benefit from the new 400G capacity on the Japan-Singapore axis, SAVECALL is the direct route.

The result for our customers: