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The Korea Research Institute of Standards and Science (KRISS) and the Korea Institute of Science and Technology Information (KISTI) will collaborate to build a Korean-style time and frequency transmission network based on the national standard time.
At a recent ‘Time-Net Korea 2026’ workshop jointly held in Seoul by the two organizations, participants discussed methods for supplying time to complement GNSS, such as optical communication networks, geostationary satellites, and terrestrial broadcasting. The core agenda was the ‘Time-Net Korea’ plan to directly transmit national standard time through domestic optical communication networks.
KRISS generates and maintains the Republic of Korea’s standard time, which is then carried on the National Science and Technology Research Network (KREONET) operated by KISTI and supplied to places requiring precise time. Once a new transmission network is established, it will secure a high-precision time supply network that is not affected by radio interference, enabling the construction of an independent national time infrastructure.
Over the past year, KRISS has kept the country’s standard time to within 5 nanoseconds of Coordinated Universal Time (UTC) using an optical clock it developed that produces only about 1 second of error over 2 billion years.
KISTI’s National Science and Technology Research Network connects more than 200 institutional investors nationwide, allowing it to stably transmit precise time across the country.
Recently, using this network, KRISS successfully transmitted precise time signals with picosecond level accuracy over a 230-kilometer section between KRISS and Yonsei Radio Observatory.
