The Mexican satellite system is domestic and operates 120 earth stations. There is also extensive microwave radio relay network and considerable use of fiber-optic and coaxial cable. Mexican satellites are operated by ''Satélites Mexicanos'' (Satmex), a private company, leader in Latin America and servicing both North and South America. It offers broadcast, telephone and telecommunication services to 37 countries in the Americas, from Canada to Argentina. Through business partnerships Satmex provides high-speed connectivity to ISPs and Digital Broadcast Services. Satmex maintains its own satellite fleet with most of the fleet being designed and built in Mexico.