What each country and landing point keeps if Thailand Domestic Submarine Cable Network (TDSCN) goes down. A calculation from our cable and landing-point database, not a forecast.
Chumphon, Thailand: no other cable lands within 50 km.
Koh Samui, Thailand: no other cable lands within 50 km.
Phetchaburi, Thailand: no other cable lands within 50 km.
On an island this means losing the submarine link; on the mainland traffic can still go over land.
No alerts from our monitoring on this cable in the last 180 days. Events feed →
Counted: other international cables landing in the same country (domestic cables between points of one country are not a way out), other cables at landing points within 50 km, and whether the country has land links. Not counted: cable capacity, operator contracts and satellite. Use as a first look at dependence, not as a statement of what would happen.
About the Thailand Domestic Submarine Cable Network (TDSCN) Cable System
Thailand Domestic Submarine Cable Network (TDSCN): connecting Thailand's coastal regions
The Thailand Domestic Submarine Cable Network (TDSCN) is a submarine telecommunications cable system designed to interlink key coastal areas within Thailand. Spanning 884 kilometers, the cable is owned by National Telecom, a state-owned enterprise responsible for telecommunications infrastructure in the country. It has been listed as in service since its recorded ready-for-service (RFS) year of 2001, according to GeoCables data.
What makes TDSCN particularly notable is its role as a domestic network, serving Thailand's internal connectivity needs rather than international traffic. Publicly available data about its design capacity, fiber pairs, supplier, and technology is scarce, leaving certain technical aspects of the cable shrouded in uncertainty. Additionally, the cable's landing points in regions like Songkhla and Sriracha are hubs for other major international cables, raising questions about how TDSCN interacts with or complements these systems.
The TDSCN connects five landing points along Thailand's coastline: Chumphon, Koh Samui, Phetchaburi, Songkhla, and Sriracha. These locations span both the Gulf of Thailand and the Andaman Sea, ensuring connectivity across diverse geographic regions. Chumphon and Koh Samui are situated in southern Thailand, while Phetchaburi lies closer to the central region. Songkhla, a major port city in the south, and Sriracha, located near Bangkok, are critical nodes for domestic and international telecommunications.
Songkhla and Sriracha are particularly noteworthy as they serve as landing points for several other cables, including international systems such as Asia Africa Europe-1 (AAE-1) and the Asia-America Gateway (AAG) Cable System. This geographical overlap suggests that TDSCN may play a complementary role to these larger systems, facilitating domestic traffic while international cables handle cross-border connectivity.
Why it was built and what it carries
The TDSCN was likely constructed to address Thailand's growing demand for reliable domestic telecommunications infrastructure in the early 2000s. By interlinking key coastal regions, the cable enables faster and more reliable data transfer across the country, supporting both urban centers and remote areas. While specific details about the type of traffic it carries are not publicly disclosed, it can be reasonably assumed that the cable serves a mix of consumer internet, enterprise data, and potentially government communications.
History: what can be established
The GeoCables database records the TDSCN's ready-for-service year as 2001. However, no conflicting dates from other industry sources are currently known, so this date is taken as authoritative. The cable was developed during a period of rapid growth in Thailand's telecommunications sector, driven by increasing internet penetration and the need for sturdy infrastructure to support economic development. National Telecom, the owner, has historically played a central role in building and maintaining domestic networks.
Capacity and technology
Publicly available information does not disclose the design capacity, fiber pair count, or specific technologies employed in the TDSCN. Without operator documentation, attributing these details would be speculative. Given its domestic focus and the era of its construction, the cable likely uses standard optical fiber technology of the time, but its exact specifications remain unknown.
Latency: the physics
The theoretical one-way light propagation latency over the cable's 884-kilometer length is approximately 4.3 milliseconds. This corresponds to a round-trip time (RTT) floor of 8.7 milliseconds for the wet segment, assuming light travels at 200,000 to 204,000 km/s in optical fiber. Real-world latency measurements would be higher due to additional factors such as land-based connections, terminal equipment delays, and routing inefficiencies. No live measurements for TDSCN are currently available, so its actual performance remains unquantified.
Redundancy: what happens if it breaks
In the event of a failure, redundancy for domestic traffic in Thailand would likely depend on terrestrial networks and the overlapping presence of other submarine cables at key landing points like Songkhla and Sriracha. These locations host international systems such as Asia Africa Europe-1 (AAE-1), Asia Pacific Gateway (APG), and the Asia-America Gateway (AAG) Cable System, which could potentially reroute traffic. Repairing submarine cables typically involves deploying specialized cable ships to locate and fix the damaged section, a process that can take days to weeks depending on the severity of the issue and weather conditions.
Bottom line
The Thailand Domestic Submarine Cable Network (TDSCN) spans 884 kilometers and connects five coastal regions within Thailand.
Its ready-for-service year is recorded as 2001, with no known conflicts from other sources.
Owned by National Telecom, the cable is listed as in service but lacks publicly disclosed details about its capacity, fiber pairs, supplier, or technology.
Theoretical latency for the wet segment is approximately 8.7 milliseconds RTT, but real-world performance is higher.
Redundancy may rely on terrestrial networks and international cables at shared landing points.