What is the Vocus AP2 upgrade?

AP2 is the upgrade of Vocus's second Adelaide-Perth optical fibre system, completed on 14 June 2026. It uses Ciena WaveLogic 6 Extreme coherent optics across C-band and L-band spectrum to roughly double the usable capacity of the existing cable without laying new fibre. Combined with the AP1 upgrade delivered in 2025, the two systems form a 2,700km dual-route platform carrying four times the capacity of the previous generation. Customers can now buy native 400Gbps services on the route alongside existing 100Gbps services.

Why is the Adelaide-Perth fibre corridor important?

The Adelaide-Perth corridor is the main land path across the Nullarbor between Australia's east and west coasts, and there are few diverse routes along it. It functions as backhaul for Perth's international subsea cables, including the Australia-Singapore Cable, INDIGO West and SUBCO's SMAP system. A subsea cable landing in Perth only creates national value if its traffic can reach the east coast, where most Australian compute and population are concentrated. Strengthening the corridor improves both capacity and resilience for the whole national network.

How does terrestrial fibre differ from subsea cable?

Terrestrial fibre carries data over land, while subsea cable carries it under the sea. Land routes are typically shorter and deliver lower, more consistent latency between cities, which matters for AI and cloud workloads that move large volumes of data between data centres. Subsea cables connect Australia to international markets. The two are complementary: terrestrial routes such as Adelaide-Perth distribute the capacity that subsea cables land at gateway cities like Perth.

Vocus quadruples its Adelaide-Perth fibre capacity for AI

At a glance

Vocus completed the Adelaide-Perth 2 (AP2) optical upgrade on 14 June 2026, quadrupling capacity across the corridor when combined with the AP1 upgrade delivered in 2025.
The two systems now form a dual-route platform spanning 2,700km and carrying four times the capacity of the previous generation.
The upgrade uses Ciena WaveLogic 6 Extreme optics across C-band and L-band spectrum, doubling usable capacity on existing fibre without laying new cable.
Customers can now buy native 400Gbps services alongside 100Gbps, which Vocus says can be cheaper than 4 x 100G because fewer data centre cross connects are needed.
The corridor is the land bridge between Perth's international subsea cables and the east-coast data centres where most Australian compute and population sit.

A second system across the Nullarbor

Vocus has completed the AP2 upgrade on its Adelaide-Perth optical route, the western leg of the long-haul backbone that carries traffic between Australia's two coasts. The work follows the AP1 upgrade in 2025, which enabled coast-to-coast 400G services from Sydney, Melbourne and Brisbane in the east to Adelaide and Perth in the west. Together the two routes form a dual-system platform spanning 2,700km and delivering four times the capacity of the previous generation.

The headline figure is worth reading precisely. AP2 on its own roughly doubles usable capacity by transmitting across both C-band and L-band spectrum using Ciena WaveLogic 6 Extreme coherent optics. The quadrupling is the combined effect of two diverse systems, AP1 and AP2, each lit with the same spectrum-doubling approach. No new fibre was laid. Vocus has extracted more capacity from cable already in the ground, an approach that is faster and more capital-efficient than a new build that can take years to complete.

This is the latest step in a multi-year program rather than a standalone event. Vocus committed to Ciena's 1.6Tb/s WaveLogic 6 platform in 2024 and launched its first 400G coast-to-coast services in January 2025. "Australia's national challenge is no longer internet access. It's capacity on the long-haul fibre backbone that forms the arteries of the whole system," said Matt Walsh, Chief Customer Officer at Vocus. "Upgrading AP1 and AP2 now positions Australia to meet surging east-west data demand as AI adoption accelerates without running into capacity constraints."

Why the east-west corridor matters more than its traffic suggests

The Adelaide-Perth route carries less traffic than the dense Sydney-Melbourne triangle, but it sits on a strategically thin part of the map. There are few diverse land paths across the Nullarbor, so each high-capacity system added to the corridor improves national resilience as much as it adds throughput. A second lit system means a fibre cut or maintenance event on one path no longer threatens east-west connectivity on its own.

Terrestrial routes also carry data over land rather than under the sea, which shortens the distance signals travel and delivers lower, more consistent latency. That characteristic matters more as AI and cloud workloads move data between cities and data centres at scale, and Vocus notes that hyperscalers are increasingly routing east-west traffic across Australian land paths.

The corridor's real strategic value is as backhaul. Perth is Australia's western gateway for international subsea cables, including the Australia-Singapore Cable, INDIGO West and, from 2026, Bevan Slattery's SUBCO SMAP hypercable, which we covered in our analysis of Australia's fifteen subsea cables and the Marles Shangri-La speech. A cable landing in Perth only creates value if its traffic can reach the east coast, where the bulk of Australian compute, enterprise demand and population sits. Strengthening Adelaide-Perth is what turns a west-coast landing into national capacity, and it complements the hyperscaler connectivity build-out we tracked in Google and Telstra's AI connectivity partnership.

How it changes the picture for data centres

For Perth and Adelaide operators, cheaper and more abundant onward capacity to the east coast improves the case for siting facilities in the west and centre of the country. Perth's pitch as a subsea gateway depends on backhaul, a point underlying the contest for Perth's Pier DC facility. Adelaide sits midway on the corridor as an interconnection waypoint. For east-coast operators, a second western system adds diverse international reach toward Asia and the United States.

Cost is the other lever. Vocus says a native 400Gbps service can be more economical than four separate 100G services because it needs fewer cross connects at each data centre. Lower per-bit transport marginally improves the economics of distributing workloads away from the supply-constrained Sydney and Melbourne markets, where CBRE has flagged a 1.5GW shortfall and where neocloud operators are competing hardest for power and space.

The effect should not be overstated. Backbone capacity is rarely the binding constraint on an Australian data centre build. Power and grid connection are, as our coverage of the neocloud and AI factory sovereignty stack sets out. What the AP2 upgrade does is remove a future bottleneck before it bites, keeping connectivity ahead of compute rather than unlocking new capacity on its own.

VOCUS NATIONAL BACKBONE ASSETS

ASSET	TYPE	ROUTE	CAPABILITY	STATUS
AP1 (Adelaide-Perth 1)	Terrestrial fibre	Adelaide to Perth	Coast-to-coast 400G with east-coast links	Upgraded 2025
AP2 (Adelaide-Perth 2)	Terrestrial fibre	Adelaide to Perth	C+L band, native 400G, capacity roughly doubled	Completed 14 June 2026
Australia-Singapore Cable	Subsea	Perth to Singapore	International gateway to Asia	Operational
Australia Connect / Pacific Connect	Subsea (with Google)	Southeast Asia to North America via Australia	42,500km system	In development
Horizon	Terrestrial fibre	Pilbara to national backbone	2,000km regional link, Roy Hill anchor customer	Announced 2025

Source: Certified Strategic Editorial, Vocus disclosures, June 2026.

What it adds up to for the country

The national benefit is real and specific, and it is also diffuse. Lighting existing fibre with C-band and L-band spectrum is a low-footprint, capital-efficient way to add capacity, and doing it across two systems hardens a corridor that the whole eastern and western economy relies on. More domestic east-west capacity also means more traffic can stay on Australian land paths rather than routing through offshore hubs, which carries a quiet sovereignty dividend that sits alongside the resilience case CS has made in coverage of Firmus and SUBCO's Bernacchi-1 cable.

That ecosystem read was echoed by Bevan Slattery, the SUBCO and former NEXTDC founder whose SMAP system lands in Perth. Commenting on Vocus's announcement, he framed the terrestrial upgrade as complementary rather than competitive: "Great diversity for SMAP. The more routes, the more bandwidth the better. Congrats Vocus." Capacity on the national backbone is not a zero-sum contest between operators or between land and sea. A subsea founder welcoming a rival's terrestrial build is a signal that route diversity is the shared interest.

What to watch

Three markers will show whether the upgrade delivers on its promise. The first is pricing: whether native 400G services translate into measurably lower data centre interconnect costs that operators pass through. The second is the Google partnership, where milestones on the Australia Connect and Pacific Connect subsea systems will determine how much international traffic the strengthened corridor ultimately carries. The third is the next domestic corridors, including Vocus's Darwin routes and the Horizon link into the Pilbara, which extend the same backbone logic into regions where data-intensive industry is growing.