The Japan-US CN (Japan-US Cable Network or JUSCN) is the first high capacity trans-pacific subsea cable system using DWDM technology of 10 Gbps per wavelength, ready for service in August 2001 and decommissioned in July 2023. 

The Japan-US CN consists of four fiber pairs, each operating at 10 Gbps DWDM, with design capacity of 640 Gbit/s. Initially, the Japan-US CN operated at 80 Gbps with two lit fiber pairs, expanding to 400 Gbps in mid 2001 by lighting the two remaining fiber pairs each with 16 wavelengths at 10 Gbps per wavelength, further upgrading to 1.28 Tbps in early 2008. 

In early 2013, the Japan-US CN was upgraded with Ciena’s coherent 100G technology, bringing 5 Tbps of additional capacity to reach a system capacity of approximately 6.4 Tbps.

In July 2023, the Japan-US CN was decommisioned, 22 years after its ready for service in 2001, with its Segment 1 remaining operational, connecting Hawaii and California. Verizon Business Global LLC dba Verizon Business (Verizon), on behalf of the licensees of the Japan-US CN, notified the FCC later that the Japan-US CN, with the exception of Segment 1 of the cable system, was retired from service as of October 30, 2023.

In Feburary 2024, the Japan-US CN consortium selected Mertech Marine to provide a turnkey decommissioning service for the Japan–US submarine cable system, encompassing the recovery and recycling of shore-ends in both Japan and the USA and the removal of spare cable from the associated cable storage depots.

In July 2024, Verizon Business Global and Hawaiian Telecom jointly filed with the FCC to operate the California-Hawaii S1 (CHI) cable system, i.e., the remaining operational Segment 1 of the Japan-US CN.