HANTRU1 Cable System

HANTRU1 Cable System: Connecting Micronesia, Guam, and the Marshall Islands

The HANTRU1 Cable System is a submarine telecommunications cable linking Guam, the Federated States of Micronesia, and the Marshall Islands. Spanning approximately 2,917 kilometers, it provides connectivity between the landing points of Piti (Guam), Pohnpei (Micronesia), Majuro (Marshall Islands), and Kwajalein (Marshall Islands). Owned by a consortium comprising the Federated States of Micronesia Telecommunications Cable Corporation (FSMTCC), Hannon Armstrong, and the Marshall Islands Telecommunications Authority, the cable is currently listed as in service. What makes HANTRU1 particularly interesting is its role in connecting remote Pacific island nations to global networks, a function that is often challenging due to geographic isolation. However, several technical and historical details remain undisclosed, including its design capacity, fiber pair count, and supplier. Publicly available data does not clarify these aspects, leaving room for speculation about the cable’s technological specifics.

Quick facts

Name	HANTRU1 Cable System
Length	2,917 km
Ready-for-Service Year	2010 (GeoCables database value; industry sources may differ)
Owners	FSMTCC, Hannon Armstrong, Marshall Islands Telecommunications Authority
Status	In service
Design Capacity	Not disclosed
Fiber Pairs	Not disclosed
Supplier	Not disclosed
Landing Points	Piti (Guam), Pohnpei (Micronesia), Majuro (Marshall Islands), Kwajalein (Marshall Islands)

Show HANTRU1 Cable System on the interactive cable map

Route

The HANTRU1 Cable System connects four landing points across the western Pacific Ocean:

• Piti, Guam - a major hub for submarine cables in the Pacific region, hosting connections to several international systems including SEA-US, JGA-N, and PPC-1.
• Pohnpei, Micronesia - a critical connection point for the Federated States of Micronesia, also linked to the Chuuk-Pohnpei Cable and the East Micronesia Cable System.
• Majuro, Marshall Islands - another landing point also served by the IOKWE cable.
• Kwajalein, Marshall Islands - similarly connected to the IOKWE cable system.

This route strategically links the islands to Guam, enhancing their access to international networks.

Why it was built and what it carries

HANTRU1 was constructed to improve telecommunications infrastructure for the Federated States of Micronesia and the Marshall Islands, regions previously reliant on satellite connectivity. Submarine cables offer significantly lower latency and higher bandwidth compared to satellite systems, enabling better internet access, economic development, and improved communication services. While specific details about the cable's traffic or bandwidth utilization are not disclosed, it likely carries a mix of internet, voice, and data services, serving residential, governmental, and commercial needs.

History: what can be established

The GeoCables database lists HANTRU1’s ready-for-service year as 2010. However, industry sources occasionally report conflicting dates, suggesting construction or activation might have occurred earlier or later. Such discrepancies could arise from differences in definitions (e.g., initial testing versus full commercial operation), delays in documentation, or updates to the cable system after its initial deployment.

Capacity and technology

Publicly available data does not disclose the design capacity, fiber pair count, or supplier for HANTRU1. Without operator documentation, attributing specific technological characteristics would be speculative. However, as a submarine cable serving remote islands, it likely employs industry-standard optical fiber technology and undersea repeaters to amplify signals over long distances.

Latency: the physics

Theoretical latency for light propagation over the 2,917 km wet segment is approximately 14.3 milliseconds one-way, or 28.6 milliseconds for round-trip time (RTT). Real-world latency measurements are higher due to additional factors such as terrestrial network delays, routing inefficiencies, and terminal equipment. For instance, remote probes recorded the following minimum RTTs:

• Piti -> Majuro: 29.3 ms
• Majuro -> Piti: 192.3 ms
• Sydney -> Majuro: 202.7 ms

These values reflect the full internet path rather than the cable alone, making them less precise for evaluating HANTRU1’s performance directly.

Redundancy: what happens if it breaks

In the event of a failure, redundancy for HANTRU1’s landing points is partially provided by other cables. For example:

• Kwajalein and Majuro are connected to the IOKWE cable system.
• Pohnpei has links to the Chuuk-Pohnpei Cable and the East Micronesia Cable System.
• Piti serves as a hub for numerous international cables, including SEA-US, JGA-N, and PPC-1.

Standard repair practices in the industry involve deploying specialized cable ships to locate, retrieve, and repair damaged segments. However, repair times can vary significantly based on the location of the fault and the availability of equipment.

Bottom line

• The HANTRU1 Cable System spans 2,917 km and connects Guam, Micronesia, and the Marshall Islands.
• Its ready-for-service year is recorded as 2010, though conflicting industry sources exist.
• Design capacity, fiber pair count, supplier, and technology specifics are not publicly disclosed.
• Theoretical latency is 28.6 ms RTT for the wet segment, with real-world measurements showing higher values.
• Redundancy is provided by other cables at its landing points, including IOKWE, Chuuk-Pohnpei Cable, and SEA-US.