Corse-Continent 5 (CC5): submarine cable linking Corsica and mainland France
Corse-Continent 5 (CC5) is a submarine telecommunications cable connecting the French island of Corsica to mainland France. It spans 299 kilometers between
Ajaccio, Corsica, and
La Seyne, near Toulon, on the French mainland. Owned by Orange, CC5 has been listed as in service since 1995 according to the GeoCables database. This cable is part of a family of systems, following its predecessor
Corse-Continent 4 (CC4).
What makes CC5 particularly interesting is the scarcity of publicly disclosed technical details about its design and capacity. While it is operational and presumably plays a role in Corsica's connectivity, there is no available data on its design capacity, fiber pair count, or supplier. This lack of transparency is unusual for submarine cables, especially one that has been in service for decades.
Quick facts
| Cable name | Corse-Continent 5 (CC5) |
| Length | 299 km |
| Ready for service | 1995 (GeoCables database value) |
| Owner | Orange |
| Status | In service |
| Design capacity | Not disclosed |
| Fiber pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing points | Ajaccio (France); La Seyne (France) |
| Other cables at Ajaccio | Medloop |
| Same family systems | Corse-Continent 4 (CC4) |
Route
CC5 connects Ajaccio, a major city on the west coast of Corsica, to La Seyne, a coastal town in southeastern France near Toulon. Corsica is located in the Mediterranean Sea, approximately 170 kilometers from the French mainland. The cable's route traverses the Tyrrhenian Basin, a region of the Mediterranean known for its relatively shallow waters compared to the Atlantic, which simplifies cable laying and maintenance.
Ajaccio is a critical hub for Corsica's telecommunications, and its connection to the mainland via CC5 ensures the island's integration into France's broader telecom network. La Seyne, on the mainland, is strategically located near Toulon, a city with significant maritime infrastructure.
Why it was built and what it carries
CC5 was built to enhance connectivity between Corsica and mainland France, providing reliable telecommunications services to the island's residents and businesses. Corsica's geographic isolation makes submarine cables essential for its integration into national and international networks. While the specific traffic carried by CC5 is not disclosed, it likely supports internet, voice, and data services for both residential and commercial users.
The cable also serves as a redundancy mechanism for Corsica's connectivity, complementing other systems such as Medloop that land at Ajaccio. This redundancy is critical in ensuring uninterrupted service in case of cable faults or maintenance.
History: what can be established
According to the GeoCables database, CC5 was ready for service in 1995. This date aligns with the broader trend of submarine cable deployments in the 1990s, driven by increasing demand for international connectivity. However, no alternative industry sources were identified that suggest a conflicting RFS year.
CC5 succeeded Corse-Continent 4 (CC4), indicating a generational upgrade in the Corsica-mainland connectivity system. The specifics of what improvements CC5 introduced over CC4 remain undocumented in public sources.
Capacity and technology
The design capacity, fiber pair count, supplier, and technology of CC5 are not publicly disclosed. Without operator documentation, attributing specific technical characteristics to the cable would be speculative. Given its age, CC5 likely uses optical fiber technology typical of the mid-1990s, but whether it has been upgraded since its initial deployment is unknown.
Latency: the physics
Theoretical one-way light propagation over the 299-kilometer wet segment of CC5 is approximately 1.5 milliseconds, with a round-trip time (RTT) floor of 2.9 milliseconds. These calculations assume light travels through fiber at speeds between 200,000 and 204,000 km/s. However, real-world latency is higher due to additional factors such as land tails, terminal equipment, and network routing.
GeoCables live measurements provide insights into end-to-end latency involving CC5's landing points:
- Kyiv to Ajaccio: min 56.3 ms, avg 58.9 ms
- Sydney to Ajaccio: min 255.3 ms, avg 258.7 ms
- Odessa to Ajaccio: min 57.6 ms, avg 62.0 ms
- Minsk to La Seyne: min 45.7 ms, avg 46.6 ms
- Odessa to La Seyne: min 49.2 ms, avg 50.7 ms
- Sydney to La Seyne: min 247.3 ms, avg 247.4 ms
These measurements reflect the full internet path, not just the cable itself, and include delays from terrestrial networks and routing.
Redundancy: what happens if it breaks
If CC5 experiences a fault, Corsica's connectivity to mainland France would rely on alternative systems such as Medloop, which also lands at Ajaccio. Redundancy is a standard practice in submarine cable systems to mitigate the impact of outages. Repairs typically involve deploying specialized cable ships to locate, retrieve, and fix the damaged section. The Tyrrhenian Basin's relatively shallow waters simplify these operations compared to deeper oceanic regions.
Bottom line
- Corse-Continent 5 (CC5) connects Ajaccio, Corsica, to La Seyne, France, spanning 299 km.
- It has been in service since 1995, according to GeoCables data.
- Owned by Orange, its technical specifications (design capacity, fiber pairs, supplier) are not publicly disclosed.
- Theoretical RTT over the wet segment is approximately 2.9 ms, with real-world latency influenced by terrestrial factors.
- Redundancy is provided by other systems like Medloop, ensuring continued connectivity for Corsica.