SEACOM/Tata TGN-Eurasia

SEACOM/Tata TGN-Eurasia: A Pan-Regional Submarine Cable

The SEACOM/Tata TGN-Eurasia cable is an extensive submarine telecommunications system connecting multiple regions across Africa, the Middle East, and South Asia. With a total length of approximately 15,000 kilometers, it links key landing points in Tanzania, Djibouti, Saudi Arabia, Mozambique, Kenya, South Africa, India, and Egypt. Jointly owned by SEACOM and Tata Communications, the cable has been operational since 2009 according to GeoCables records, although discrepancies in industry sources are noted. What makes this cable particularly interesting is its role in connecting diverse geographies and economies, facilitating international data traffic across continents. However, many technical details about its capacity, fiber pairs, and supplier remain undisclosed, leaving room for speculation about its exact technological specifications. Additionally, latency measurements from live probes highlight the challenges of interpreting real-world performance data, especially when artifacts are present.

Quick facts

Name	SEACOM/Tata TGN-Eurasia
Length	15,000 km
Ready-for-service year	2009 (GeoCables database; industry discrepancies noted)
Owners	SEACOM, Tata Communications
Status	In service
Design capacity	Not disclosed
Fiber pairs	Not disclosed
Supplier	Not disclosed
Technology	Not disclosed

Route

The SEACOM/Tata TGN-Eurasia cable connects eight landing points: Dar Es Salaam (Tanzania), Djibouti City (Djibouti), Jeddah (Saudi Arabia), Maputo (Mozambique), Mombasa (Kenya), Mtunzini (South Africa), Mumbai (India), and Zafarana (Egypt). This route spans the Indian Ocean and Red Sea, linking East Africa to South Asia and the Middle East. The cable's corridor intersects regions with significant demand for international connectivity, serving as a bridge between Africa's emerging markets and the global internet infrastructure.

Why it was built and what it carries

The cable was built to address the growing need for high-capacity international connectivity in Africa, the Middle East, and South Asia. By linking these regions, SEACOM/Tata TGN-Eurasia facilitates data traffic for telecommunications, internet services, and enterprise applications. It also provides redundancy for other cables in the corridor, ensuring continued service in case of outages elsewhere.

History: what can be established

GeoCables records the cable's ready-for-service year as 2009. However, some industry sources suggest alternative dates, possibly due to phased activation of segments or delays in documentation. Such discrepancies are common in the submarine cable industry, where timelines can vary depending on technical, regulatory, or commercial factors. Without operator confirmation, the exact cause of the discrepancy remains speculative.

Capacity and technology

Publicly available data does not disclose the cable's design capacity, fiber pairs, supplier, or specific technology. While SEACOM and Tata Communications are known for deploying advanced systems, attributing specific capabilities to this cable without documentation would be speculative. It is likely that the cable supports high-speed data transmission, but the absence of detailed specifications limits further analysis.

Latency: the physics

The theoretical one-way latency for light propagation over 15,000 km of fiber is approximately 73.5 milliseconds, with a round-trip time (RTT) floor of 147.1 milliseconds. However, real-world latency is higher due to factors such as land-based network segments, terminal equipment, and routing inefficiencies. Live measurements from remote probes show significant variation:

• Mumbai -> Mtunzini: min 291.1 ms, avg 310.7 ms
• Mtunzini -> Mumbai: min 289.6 ms, avg 310.2 ms
• Cape Town -> Mtunzini: min 22.3 ms (artifact flagged below physical floor), avg 22.4 ms
• Jerusalem -> Mtunzini: min 237.4 ms, avg 241.8 ms
• Sydney -> Mtunzini: min 397.7 ms, avg 418.6 ms
• Jerusalem -> Djibouti City: min 118.1 ms (artifact flagged below physical floor), avg 119.0 ms

Measurements flagged as below the physical latency floor are artifacts caused by rate-limited ICMP replies or intermediate router behavior and should not be interpreted as cable performance.

Redundancy: what happens if it breaks

The SEACOM/Tata TGN-Eurasia cable operates in a corridor with numerous alternative systems. For example, Dar Es Salaam is connected by 2Africa, DARE 1, EASSy, and SEAS. Similarly, Mumbai has connectivity via 2Africa, AAE-1, BBG, EIG, FEA, IMEWE, and others. These alternatives provide redundancy, ensuring that data traffic can be rerouted in case of outages. Repairing submarine cables typically involves specialized vessels equipped with remotely operated vehicles (ROVs) to locate and fix faults. Repairs can take days to weeks, depending on the nature of the damage and environmental conditions.

Bottom line

• The SEACOM/Tata TGN-Eurasia cable spans 15,000 km, connecting Africa, the Middle East, and South Asia.
• Operational since 2009 (GeoCables database), though industry sources suggest possible discrepancies.
• Technical details such as design capacity, fiber pairs, and supplier are not publicly disclosed.
• Latency measurements highlight real-world complexities and artifacts in data collection.
• Redundancy is provided by numerous other cables in the corridor.