NEC to build NTT-led JUNO subsea cable system. NEC Corporation has been selected to build the newly announced trans-Pacific subsea cable, JUNO. To be built by Seren Juno Network Co (Seren), a company established by NTT Ltd Japan Corporation, Mitsui & Co, PC Landing Corp, and JA Mitsui Leasing, the cable will connect California in the US with Chiba prefecture and Mie prefecture in Japan.