The South American Crossing (SAC) cable system includes undersea and terrestrial fiber optic ring network of projectapproximately 12,000 route miles (20,000 km).

The SAC cable system forms a four-fiber pair ring using dense wavelength division multiplexing (DWDM) technology.

The SAC cable system was built by Global Crossing, ready for service in September 2000.

The subsea portions of the SAC cable system lands at:

• Las Toninas (Argentina),
• Fortaleza (Brazil),
• Rio de Janeiro (Brazil),
• Santos (Brazil),
• St. Croix (US Virgin Islands),
• Puerto Viejo, Venezuela
• Colon, Panama
• Fort Amador (Panama)
• Buenaventura (Colombia)
• Lurin (Peru),
• Valparaiso (Chile)

In 2015, Level 3 added an extension to the SAC cable system with a new branch to a cable station at Punta Bazan in Buenaventura on Colombia's Pacific coast near Cali. The new SAC Colombia spur has a design capacity of 4.5 Tbps and initial capacity of 400 Gbps.

Terrestrial segments of the SAC cable system connect to most major South American cities, including Rio de Janeiro, Sao Paulo, Buenos Aires, Santiago, Lima, Cali, and Bogota. The SAC ring network completes on its southern-most end by a terrestrial link across the Andes between Las Toninas and Valparaiso.

The SAC cable system is now part of CenturyLink's network assets, as well as Mid-American Crossing (MAC), Pan-American Crossing (PAC), and Atlantic Crossing 1 (AC-1), AC-2/Yellow, Hawaii Island Fiber Network (HIFN), etc.