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. Japan-US CN consists of four fiber pairs, each operating at 10 Gbps DWDM, with design capacity of 640 Gbit/s. Initially, Japan-US CN operated at 80 Gbit/s 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.