Eastern Caribbean Fiber System (ECFS)

Eastern Caribbean Fiber System (ECFS): Connecting the Eastern Caribbean Islands

The Eastern Caribbean Fiber System (ECFS) is a submarine cable system that spans 1730 kilometers, linking 14 landing points across the Eastern Caribbean region. Operational since 1995, it is co-owned by a consortium of telecom operators including AT&T, Claro Dominicana (Codetel), Guyana Telephone and Telegraph (GT&T), Liberty Networks, Orange, and Verizon. This cable remains in service today, supporting communications across a geographically dispersed set of islands. What makes ECFS notable is its extensive reach within the Eastern Caribbean, connecting smaller island nations and territories that rely heavily on submarine cables for international connectivity. However, many technical details about the cable, such as its design capacity, fiber pair count, supplier, and specific technology, are not publicly disclosed, leaving gaps in the understanding of its full capabilities.

Quick facts

System Name	Eastern Caribbean Fiber System (ECFS)
Length	1730 km
Ready For Service (RFS)	1995 (GeoCables database value; conflicting industry sources not surfaced)
Owners	AT&T, Claro Dominicana (Codetel), Guyana Telephone and Telegraph (GT&T), Liberty Networks, Orange, Verizon
Status	In service
Design Capacity	Not disclosed
Fiber Pairs	Not disclosed
Supplier	Not disclosed
Technology	Not disclosed

Show Eastern Caribbean Fiber System (ECFS) on the interactive cable map

Route

The ECFS connects 14 landing points across the Eastern Caribbean islands, including Bridgetown (Barbados), Castries (Saint Lucia), Chaguaramas (Trinidad and Tobago), Frigate Bay (Saint Kitts and Nevis), Kingstown (Saint Vincent and the Grenadines), Le Lamentin (Martinique), Point Salines (Grenada), Pointe-a-Pitre (Guadeloupe), Roseau (Dominica), Saint Maarten (Sint Maarten), St. John’s (Antigua and Barbuda), The Valley (Anguilla), and Tortola (Virgin Islands (U.K.)). This route provides a critical link for communications between these islands and the broader global network.

Why it was built and what it carries

The ECFS was designed to address the communication needs of the Eastern Caribbean region, which includes many small island nations and territories. These islands depend on submarine cables for international connectivity due to their geographic isolation and limited terrestrial infrastructure. The cable supports a mix of voice, data, and internet traffic, enabling telecommunications services for both residential and commercial users.

History: what can be established

The ECFS was recorded as ready for service in 1995, according to the GeoCables database. No conflicting dates have surfaced from industry sources, which suggests this date is widely accepted. The cable has been in service for nearly three decades, indicating its durability and ongoing relevance in the region's telecommunications landscape.

Capacity and technology

Publicly available information does not disclose the design capacity, fiber pair count, supplier, or specific technology used in the ECFS. Without operator documentation, it is impossible to attribute these specifications. Given the cable's age, it is reasonable to assume that upgrades may have been performed over time to maintain its competitiveness, but this cannot be confirmed without reliable data.

Latency: the physics

Based on the cable's length of 1730 km, the theoretical one-way light propagation time is approximately 8.5 milliseconds, with a theoretical round-trip time (RTT) floor of 17.0 milliseconds. Real-world latency measurements, however, are higher due to the inclusion of land tails, terminal equipment, and routing complexities. For example, live measurements show RTTs such as 70.0 ms (minimum) between Chaguaramas and Tortola and 85.7 ms (minimum) for the reverse direction. These figures reflect the full internet path rather than the cable alone, including additional delays introduced by terrestrial networks and routing.

Redundancy: what happens if it breaks

The ECFS shares landing points with several other submarine cables, offering redundancy options in case of outages. For example, Chaguaramas is also served by Deep Blue One, EC Link, Southern Caribbean Fiber, and the Suriname-Guyana Submarine Cable System (SG-SCS). Similarly, Kingstown, Le Lamentin, Point Salines, St. John’s, and Tortola have alternative connections via cables like CARCIP, CELIA, and PCCS. Standard industry practices for submarine cable repair, such as deploying specialized cable ships for fault localization and restoration, would apply in the event of a failure.

Bottom line

• The ECFS spans 1730 km and connects 14 landing points across the Eastern Caribbean.
• Operational since 1995, it is owned by a consortium including AT&T, Claro Dominicana, GT&T, Liberty Networks, Orange, and Verizon.
• Technical details such as design capacity, fiber pairs, supplier, and technology are not publicly disclosed.
• Theoretical latency is approximately 8.5 ms one-way, but real-world RTTs are significantly higher due to additional network factors.
• Redundancy is provided by other cables at shared landing points, ensuring connectivity in case of disruptions.