The Olisipo submarine cable system is an unrepeatered 110km domestic submarine cable connecting Sines to Lisbon in Portugal.

The Olisipo cable system is developled privately by EllaLink. 

EllaLink owns and operates the EllaLink cable connecting Europe to South America from Portugal to Brazil, offering the shortest latency route from Europe to South America. By creating the Sines to Lisbon domestic subsea cable system, EllaLink is reinforcing Portugal's interconnectivity ecosystem.

The Olisipo (Sines to Lisbon) submarine cable features:

• Direct DC to DC dark fibre connectivity with CLS pass through, and alternative on-demand PoPs; 
• Ultra-high capacity with 144 unrepeated fibre pairs with an optimised optical design, with an impressive total design capacity of 4.3 Petabits; 
• A buried subsea & land cable, providing a DC entry point diversity and HDD protection in Sines, with a robust & diverse route design; 
• Sustain Diversity, and; 
• Interconnectivity between the most relevant networks through the Equinix network
• Connecting major cable landing stations in Portugal, with trunk between Carcavelos CLS and Sines CLS, reserving branches to Seixal CLS and Sesimbra CLS