Japan-Guam-Australia South (JGA-S)

Overview

Japan-Guam-Australia South (JGA-S) is a submarine cable system connecting Australia and Guam. Spanning 7,081 kilometres, it serves the corridor between the Australian continent and the United States territory of Guam in the western Pacific. The cable is owned jointly by Australia's Academic and Research Network (AARNet), Google, and Lightstorm Telecom.

Route and Landings

In Australia, JGA-S lands at two points: Brookvale in New South Wales and Maroochydore in Queensland. These two landings provide geographic diversity along Australia's eastern seaboard.

In Guam, the cable has a single landing at Piti, a location that serves as a hub for numerous submarine cable systems transiting the western Pacific.

Ownership and Operators

JGA-S is owned by three entities: AARNet, Google, and Lightstorm Telecom. AARNet is Australia's national research and education network, providing connectivity to universities and research institutions across the country. Google is a well-known technology company with extensive investments in submarine cable infrastructure across the Pacific. Lightstorm Telecom is a telecommunications carrier participating in the ownership of the system.

Status and Timeline

JGA-S entered service in 2020. The cable currently operates as a live, in-service system linking its Australian and Guamanian landing points.

Regional Context

The Australia–Guam corridor is served by a number of submarine cable systems of varying scale. JGA-S, at 7,081 kilometres, is considerably shorter than several of its regional peers. The Southern Cross Cable Network, which reached Australia in 2000, extends to 30,500 kilometres, while Asia Connect Cable-1 (ACC-1), planned for 2028, is projected at 19,000 kilometres and will also connect Australia and Guam. More recent additions to the Guam corridor include Bifrost, entering service in 2025, and Bulikula, planned for 2026. Project Waterworth, at 50,000 kilometres, represents the longest planned system with an Australian landing.

Measured performance data from 77 ping tests over the past 60 days shows an average round-trip latency of 228.6 milliseconds on this cable, with a best recorded result of 70.9 milliseconds.

Strategic Role

JGA-S provides direct submarine cable connectivity between two Australian east-coast population centres — Brookvale and Maroochydore — and the Guam hub at Piti. The presence of AARNet among the owners reflects the cable's relevance to Australia's research and education community, while Google's participation aligns with that company's broader Pacific cable portfolio. The two Australian landings in separate states offer a degree of geographic redundancy for traffic transiting this segment of the western Pacific.