Colt Technology Services will lift network capacity to 400Gb as part of a global fibre expansion that takes the carrier to 55 metropolitan networks and adds a new point of presence in Johannesburg.

The investment covers North America, Africa, Asia and the Middle East, with extensions into Warsaw, Bordeaux, Zaragoza, Berlin and Frankfurt. Colt will also widen US coast-to-coast routes and back new subsea capacity linking North America with Europe and Asia.

In Japan, the company is laying more than 600km of fibre between Osaka and Fukuoka, with further extensions planned across western Japan. Marseille and Milan get a route upgrade too — two hubs Europe likes to call "critical," though few outside the trade would notice.

Why Johannesburg and Dubai now?

Colt is opening its Johannesburg PoP and adding capacity in Dubai and Türkiye, framing the move as a response to rising demand for digital infrastructure in the Middle East and Africa.

The company pitched the expansion as AI-readiness plumbing rather than mere bandwidth. "AI readiness is about more than building capacity," said Joe Scattareggia, Colt's EVP of infrastructure and connectivity sales. "It's about connecting data, cloud and compute at the scale AI demands."

That language matters because hyperscaler traffic patterns differ sharply from the enterprise Ethernet services Colt built its reputation on. The carrier now competes for wholesale deals against subsea consortiums and Tier-1 operators who also claim to be "AI-ready."

What 400Gb really means

The 400Gb target applies to optical capacity on long-haul routes, not subscriber speeds. Colt's customers are wholesale carriers, cloud providers and data centre operators rather than retail ISPs — so the emphasis lands on backhaul and interconnect capacity, not consumer gigabit.

Subsea cable investments remain the larger commercial story for any carrier positioning itself for AI traffic. Colt's existing transatlantic capacity underpins its US-Europe business; the new round adds Asia routing and redundancy on routes that have historically priced like commodities.

Rollout timing and the missing number

"Success will depend on collaboration across carriers, cloud providers, data centres and technology partners," Scattareggia added. "By continuing to invest in our global digital infrastructure, we're bringing those ecosystems together and giving customers the reach, control and confidence they need to build, scale and grow."

In plain terms: Colt wants to be the underlying fibre behind someone else's AI service, and is spending to make sure that someone has a reason to pick them.

The carrier did not disclose a completion date or a capex figure. That absence is worth flagging — a build-out touching three continents usually carries a number attached. Expect more granular timelines at Colt's next operational update.