INGRID: A Short Submarine Cable Linking Jersey, Guernsey, and France
The INGRID submarine cable is a 64-kilometer telecommunications link connecting the islands of Jersey and Guernsey in the Channel Islands to mainland France. Owned by CIEG, the cable has been listed as in service since its recorded ready-for-service (RFS) year of 2004. Its route includes four landing points:
Archirondel (Jersey),
Greve de Lecq (Jersey),
Havelet Bay (Guernsey), and
Surville (France). While its design capacity, fiber pair count, supplier, and specific technology are not disclosed in publicly available sources, the cable serves as a key infrastructure element for regional connectivity.
What makes INGRID noteworthy is its relatively short length and the limited public information available about its technical specifications. Unlike many transcontinental submarine cables, which span thousands of kilometers and are widely documented, INGRID's role appears more localized, supporting communications between the Channel Islands and France. The absence of detailed public records about its capacity and technology leaves room for speculation but does not diminish its importance in the regional telecom network.
Quick facts
| Cable name | INGRID |
| Length | 64 km |
| Ready-for-service year | 2004 (GeoCables database value) |
| Owners | CIEG |
| Status | In service |
| Design capacity | Not disclosed |
| Fiber pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing points | Archirondel (Jersey), Greve de Lecq (Jersey), Havelet Bay (Guernsey), Surville (France) |
Route
The INGRID cable connects four landing points across Jersey, Guernsey, and France. On Jersey, it lands at Archirondel and Greve de Lecq, while on Guernsey, it terminates at Havelet Bay. The mainland French landing point is Surville, situated on the northern coast of Normandy. The cable's route is relatively short, spanning just 64 kilometers, and traverses the English Channel, a corridor known for its dense maritime traffic and challenging seabed conditions. Greve de Lecq is also a landing site for another cable,
Guernsey-Jersey-4, indicating some level of redundancy in the regional network.
Why it was built and what it carries
The INGRID cable was likely built to enhance connectivity between the Channel Islands and mainland France, providing a direct link for telecommunications traffic. While specific details about its capacity and the types of data it carries are not publicly disclosed, it can be assumed that the cable supports internet, voice, and data services for both residential and business users in the region. The Channel Islands, being geographically isolated, rely heavily on submarine cables for external connectivity, making INGRID an important part of their telecom infrastructure.
History: what can be established
The GeoCables database records INGRID's ready-for-service year as 2004. If any industry sources suggest a different year, they were not surfaced in this analysis. The cable has been listed as in service since its deployment, but specific milestones such as its construction timeline, commissioning process, or major upgrades are not publicly documented. This lack of detailed historical information is not uncommon for smaller regional cables, which often receive less attention than their transcontinental counterparts.
Capacity and technology
Publicly available data does not disclose INGRID's design capacity, fiber pair count, supplier, or specific technology. Without operator documentation, attributing these parameters would be speculative. Given its relatively short length and regional focus, the cable likely employs standard submarine cable technologies, but the exact configuration remains unknown.
Latency: the physics
The computed theoretical latency for light propagation over INGRID's 64-kilometer wet segment is approximately 0.3 milliseconds one-way and 0.6 milliseconds round-trip. However, real-world latency measurements are significantly higher due to additional factors such as land tails, terminal equipment, and routing. GeoCables live measurements, which reflect the full internet path rather than the cable itself, show the following minimum round-trip times to Havelet Bay:
- Minsk -> Havelet Bay: 49.5 ms
- Kyiv -> Havelet Bay: 57.6 ms
- Sydney -> Havelet Bay: 263.8 ms
These values include terrestrial routing and interconnection delays, making them much higher than the theoretical cable latency.
Redundancy: what happens if it breaks
In the event of a failure, redundancy for INGRID's route may be partially provided by other cables in the region, such as Guernsey-Jersey-4, which also lands at Greve de Lecq. Repair logistics for submarine cables typically involve specialized cable-laying and repair vessels, which are tasked with locating the fault, retrieving the damaged section, and installing a replacement. Given the cable's short length, repair operations may be relatively straightforward compared to longer transoceanic systems, but no specific documentation about INGRID's repair history is publicly available.
Bottom line
- INGRID is a 64-kilometer submarine cable connecting Jersey, Guernsey, and France.
- Owned by CIEG, it has been listed as in service since 2004.
- Its design capacity, fiber pair count, supplier, and technology are not publicly disclosed.
- Landing points include Archirondel and Greve de Lecq (Jersey), Havelet Bay (Guernsey), and Surville (France).
- Theoretical latency over the wet segment is approximately 0.6 ms round-trip, but real-world values are higher due to routing and equipment delays.
- Redundancy may be supported by Guernsey-Jersey-4, which shares a landing point at Greve de Lecq.