Timor-Leste South Submarine Cable (TLSSC): Connecting Timor-Leste to the global network
The Timor-Leste South Submarine Cable (TLSSC) is a 607-kilometer submarine telecommunications cable that links
Dili, the capital of Timor-Leste, to international connectivity. Owned by the Government of Timor-Leste, the cable is listed as in service, with its ready-for-service (RFS) year recorded in the GeoCables database as 2025. This infrastructure represents an important step for Timor-Leste in enhancing its digital capacity and integrating with global networks.
What makes the TLSSC particularly interesting is the lack of publicly disclosed technical details about its design capacity, fiber pairs, supplier, and technology. Such omissions are not uncommon in the submarine cable industry, especially for government-led projects. Additionally, while GeoCables lists the cable as operational, no live latency measurements are available, leaving some uncertainty about its real-world performance.
Quick facts
| Cable name |
Timor-Leste South Submarine Cable (TLSSC) |
| Length |
607 km |
| Ready-for-service year |
2025 (GeoCables database) |
| Owner |
Government of Timor-Leste |
| Status |
In service |
| Design capacity |
Not disclosed |
| Fiber pairs |
Not disclosed |
| Supplier |
Not disclosed |
| Technology |
Not disclosed |
| Landing points |
Dili (Timor-Leste) |
| Other cables at Dili |
Asia Connect Cable-1 (ACC-1), Hawaiki Nui 1 |
Route
The TLSSC lands in Dili, Timor-Leste, providing the country with a direct connection to international networks. While the cable's specific offshore route has not been disclosed, its 607-kilometer length suggests it connects Timor-Leste to a regional hub or another international cable system. Dili is already connected to other cables, including the Asia Connect Cable-1 (ACC-1) and Hawaiki Nui 1, reinforcing its strategic importance as a telecommunications gateway.
Why it was built and what it carries
The TLSSC was likely built to address Timor-Leste's growing demand for reliable and high-speed internet connectivity, which is essential for economic development, education, healthcare, and government services. By owning the cable, the Government of Timor-Leste can ensure greater control over its telecommunications infrastructure and reduce dependency on external operators. The cable is expected to carry internet, voice, and data traffic, supporting both domestic and international communication needs.
History: what can be established
The GeoCables database lists the TLSSC's ready-for-service year as 2025, but it is unclear whether this date reflects the actual operational start or a projected timeline. Publicly available information does not confirm the exact commissioning date, nor does it provide details about the construction timeline or the supplier involved. This lack of transparency is not uncommon for government-led projects in smaller markets.
Capacity and technology
No data regarding the TLSSC's design capacity, fiber pairs, or technology has been disclosed in public sources. Without operator documentation, it is impossible to state the cable's throughput or technical specifications. The absence of such details makes it difficult to compare the TLSSC to other regional cables, such as the Asia Connect Cable-1 and Hawaiki Nui 1, which also land in Dili.
Latency: the physics
Theoretical calculations based on the cable's 607-kilometer length suggest a one-way light propagation latency of approximately 3.0 milliseconds, with a round-trip time (RTT) floor of 6.0 milliseconds over the wet segment. However, real-world latency is higher due to additional factors such as land-based network infrastructure, terminal equipment processing, and routing inefficiencies. No live measurements are currently available for the TLSSC, leaving its actual latency performance unverified.
Redundancy: what happens if it breaks
If the TLSSC experiences a fault, redundancy is available through the Asia Connect Cable-1 (ACC-1) and Hawaiki Nui 1, both of which also land in Dili. These alternative cables provide Timor-Leste with backup connectivity, reducing the risk of prolonged outages. Repairing a submarine cable typically involves deploying specialized cable ships to locate and fix the fault, a process that can take days to weeks depending on the severity of the damage and weather conditions.
Bottom line
- The Timor-Leste South Submarine Cable (TLSSC) spans 607 km and is listed as in service.
- Owned by the Government of Timor-Leste, its ready-for-service year is recorded as 2025.
- Technical details such as design capacity, fiber pairs, supplier, and technology remain undisclosed.
- The cable lands in Dili, alongside Asia Connect Cable-1 (ACC-1) and Hawaiki Nui 1.
- Theoretical latency over the wet segment is ≈ 6.0 ms RTT, but real-world performance is unverified.
- Redundancy is available through other cables landing in Dili, mitigating connectivity risks.