JCSAT-18/KACIFIC-1 is a joint high-throughput communications satellite for Sky Perfect JSAT Corp. of Japan and a Singapore telecommunications company Kacific Broadband Satellites. Satellite will provide mobile telephone, data and internet services throughout the Asia-Pacific region. The JCSAT-18 payload will provide Ku-band coverage and improve mobile and broadband services for SKY Perfect JSAT Corporation customers in the Asia-Pacific region, including the far eastern part of Russia. The satellite features technologies in the power subsystem to achieve highest efficiencies, and it also features command and data handling technologies to provide a more secure spacecraft. The KACIFIC-1 payload is designed to deliver uncontended broadband throughput via 56 Ka-band narrow beams, each having a capacity up to 1.25 Gbps, with the highest signal power ever achieved in the region. The beams are selectively tailored to cover precise pockets of demand in a geographically dispersed footprint of 20 Pacific and South East Asian nations.