Lanis-3: Short Submarine Cable Connecting Troon and Whitehead
The Lanis-3 submarine cable is a relatively short telecommunications system spanning 122 kilometers and linking Troon and Whitehead, both located in the United Kingdom. Owned by Vodafone, it has been operational since 1992 according to GeoCables records. This cable is part of the Lanis family, which includes
Lanis-1 and
Lanis-2, though specific details about its design capacity, fiber pair count, supplier, and technology have not been disclosed publicly.
What makes Lanis-3 noteworthy is its longevity, remaining in service for over three decades. However, public information about its technical specifications and operational role is scarce, leaving questions about its current capacity and technology. Additionally, while GeoCables lists its ready-for-service year as 1992, it is worth investigating whether industry sources corroborate this date or suggest an alternative.
Quick facts
| Name | Lanis-3 |
| Length | 122 km |
| Ready-for-service year | 1992 (GeoCables database value; industry sources not yet reviewed) |
| Owner | Vodafone |
| Status | In service |
| Design capacity | Not disclosed |
| Fiber pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing points | Troon (United Kingdom); Whitehead (United Kingdom) |
| Related systems | Lanis-1, Lanis-2 |
Route
Lanis-3 connects Troon, located on the west coast of Scotland, to Whitehead, situated on the northeastern coast of Northern Ireland. This short corridor crosses the North Channel, a body of water separating Scotland and Northern Ireland. Both landing points are geographically close, making the cable relatively straightforward to lay and maintain compared to longer transoceanic systems.
Why it was built and what it carries
The primary purpose of Lanis-3 is likely to provide reliable connectivity between Scotland and Northern Ireland, facilitating regional telecommunications and data exchange. As part of the Lanis family, it may complement or enhance the capacity provided by Lanis-1 and Lanis-2, though the specifics of its role within the network are not publicly documented. Given its age, Lanis-3 may have been initially designed for voice and early data services, with subsequent upgrades to support modern internet traffic.
History: what can be established
GeoCables lists the ready-for-service year of Lanis-3 as 1992. If industry sources or Vodafone documentation suggest a different date, it would be important to surface the discrepancy and explore potential explanations, such as delays in deployment, phased activation of segments, or differences in how "ready-for-service" is defined. As of now, no conflicting dates have been identified.
Capacity and technology
Publicly available information does not disclose the design capacity, fiber pair count, supplier, or technology of Lanis-3. Without operator documentation, attributing these details would be speculative. Given its age, it is plausible that the cable has undergone upgrades to keep pace with evolving telecommunications standards, but the specifics remain unknown.
Latency: the physics
The theoretical one-way light propagation time over the 122 km wet segment of Lanis-3 is approximately 0.6 milliseconds, resulting in a round-trip time (RTT) floor of 1.2 milliseconds. However, real-world latency is higher due to factors such as land-based network tails, terminal equipment processing, and routing inefficiencies.
GeoCables live measurements provide insight into end-to-end latency for internet traffic involving Troon. For example:
- Minsk -> Troon: 61.7 ms
- Saint Petersburg -> Troon: 68.8 ms
- Kyiv -> Troon: 55.2 ms
- Moscow -> Troon: 58.5 ms
- Singapore -> Troon: 176.9 ms
- Sydney -> Troon: 278.3 ms
These values reflect the full internet path, not the cable itself, and include terrestrial routing and additional network hops.
Redundancy: what happens if it breaks
If Lanis-3 were to experience a fault, redundancy within the corridor is likely provided by other systems in the Lanis family, such as Lanis-1 and Lanis-2. Repairing a cable of this length typically involves deploying specialized vessels to locate and fix the fault, a process that can take days to weeks depending on weather conditions and the nature of the damage. Given its regional role, disruptions to Lanis-3 could impact connectivity between Scotland and Northern Ireland but are unlikely to affect broader international traffic.
Bottom line
- Lanis-3 is a 122 km submarine cable connecting Troon and Whitehead in the United Kingdom.
- Owned by Vodafone, it has been listed as in service since 1992 according to GeoCables records.
- Publicly available data does not disclose its design capacity, fiber pairs, supplier, or technology.
- Theoretical RTT over the wet segment is 1.2 ms, but real-world latency is higher due to additional factors.
- Redundancy is likely provided by other systems in the Lanis family, such as Lanis-1 and Lanis-2.