Batam Singapore Cable System (BSCS): A Short Submarine Link Between Indonesia and Singapore
The Batam Singapore Cable System (BSCS) is a submarine fiber-optic cable connecting Batam, Indonesia, to
Changi North, Singapore. Spanning just 73 kilometers, it is one of the shortest international submarine cables in operation, designed to facilitate high-speed data transmission between the two countries. Owned by Telkom Indonesia, BSCS has been listed as in service since 2009, according to GeoCables records.
What makes BSCS particularly interesting is its role within a densely interconnected submarine cable corridor. Both Batam and Changi North serve as landing points for numerous other cables, creating a complex web of redundancy and capacity. However, specific details about BSCS's design capacity, fiber pairs, supplier, and technology have not been disclosed publicly, leaving gaps in the technical understanding of this cable.
Quick facts
| Cable Name | Batam Singapore Cable System (BSCS) |
| Length | 73 km |
| Ready for Service (RFS) | 2009 (GeoCables database value) |
| Owner | Telkom Indonesia |
| Status | In service |
| Design Capacity | Not disclosed |
| Fiber Pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing Points | Batam (Indonesia), Changi North (Singapore) |
Route
The BSCS connects Batam, an island in Indonesia's Riau Archipelago, to Changi North in Singapore. Batam is a major hub for submarine cables, hosting landings for over 20 systems, including
Apricot,
Asia Connect Cable-1 (ACC-1), and Indonesia Global Gateway (IGG). Similarly, Changi North is a critical landing site in Singapore, serving cables such as Asia-America Gateway (AAG),
EAC-C2C, and
Tata TGN-Intra Asia (TGN-IA). The short distance of 73 kilometers between these two points ensures relatively low latency for data transmission.
Why it was built and what it carries
BSCS was built to strengthen connectivity between Indonesia and Singapore, two nations with significant economic and digital ties. Singapore is a global data hub, while Indonesia has a rapidly growing digital economy. The cable likely supports a mix of commercial internet traffic, enterprise data, and potentially government communications. Its short length and direct route make it an efficient option for reducing latency between the two countries.
History: what can be established
GeoCables records indicate that BSCS was ready for service in 2009. This date aligns with Indonesia's broader push to expand its submarine cable infrastructure during the late 2000s. However, industry sources occasionally report discrepancies in RFS dates for older cables. Possible reasons for such conflicts include delays in documentation, phased activation of segments, or confusion with other cables in the same corridor. Without corroborating evidence, the 2009 date remains the most reliable reference.
Capacity and technology
Publicly available information does not disclose BSCS's design capacity, fiber pair count, supplier, or specific technological details. While modern cables often employ dense wavelength-division multiplexing (DWDM) to maximize capacity, attributing such features to BSCS without operator documentation would be speculative. The lack of transparency is not uncommon for smaller or regional cables, especially those owned by state-linked entities.
Latency: the physics
The theoretical one-way light propagation latency over BSCS's 73-kilometer fiber segment is approximately 0.4 milliseconds. The round-trip time (RTT) floor, purely for the wet segment, is around 0.7 milliseconds. However, real-world RTT measurements would be higher due to additional latency introduced by land-based tails, terminal equipment, and network routing. No live measurements are currently available for BSCS, leaving its operational latency unverified.
Redundancy: what happens if it breaks
BSCS operates within a highly redundant corridor. Alternatives that land at both Batam and Changi North include
Candle,
Moratelindo International Cable System-1 (MIC-1), and
Thailand-Indonesia-Singapore (TIS). If BSCS were to experience an outage, traffic could be rerouted through these systems, minimizing disruption. Repairing a short cable like BSCS would typically involve deploying specialized cable ships to locate the fault, retrieve the damaged section, and splice in a replacement. Such operations are standard in the industry but depend on weather, sea conditions, and the availability of repair vessels.
Bottom line
- BSCS is a 73-kilometer submarine cable connecting Batam, Indonesia, to Changi North, Singapore.
- Owned by Telkom Indonesia, it has been listed as in service since 2009.
- Specific details about its design capacity, fiber pairs, supplier, and technology are not publicly disclosed.
- The cable operates within a highly redundant corridor, with multiple alternatives available.
- Theoretical latency for the wet segment is approximately 0.7 milliseconds RTT, but real-world performance data is unavailable.