Why Subducting Is the Smart Way to Upgrade Fiber Networks

by Mats Jellback, Jetting AB | 17 Oct 2025

Build smarter, faster, and more sustainable installations

As fiber networks expand, new cables often need to be added to existing infrastructure. Instead of digging new trenches or replacing entire ducts, subducting — sometimes referred to as innerduct installation — makes it possible to install new microducts inside the ducts already in the ground. The result: faster, safer, and more cost-effective installations.

Jetting’s V3 and V4 Grizzon machines are designed to make this process efficient and precise. With powerful pneumatic motors and exact control, they handle subducting with the same reliability and finesse as professional fiber blowing.

It’s a smarter way to scale a network — with fewer deliveries, smaller vehicles, and less waste on site.

Future-proof networks without costly digging

Subducting allows you to prepare for future expansions from day one.
By installing microducts within a main duct you create a network that can easily be upgraded.
When demand grows, simply blow new fibers into the microducts without excavation or service interruption.

This reduces installation and maintenance costs, shortens project times, and eliminates unnecessary ground work.

Safe, precise, and cable-friendly

With Jetting’s subducting setup, the duct is installed using air-assisted force instead of mechanical pulling.
This greatly reduces friction and minimizes the risk of damage to both new and existing lines.
The result is a clean, precise, and long-lasting installation — a future-ready network built to perform for decades.

Fewer people, faster results

Traditional duct installations often require a large crew and heavy machinery.
Subducting with Jetting’s V3 or V4 requires only two trained operators, making the process safer and significantly more efficient.
Less manpower, less equipment, and faster completion — without compromising quality.

A sustainable investment

Subducting combines economic efficiency, environmental responsibility, and technical scalability — all in one process.
With Jetting’s equipment, network owners can extend capacity, improve reliability, and prepare for tomorrow’s fiber demands with minimal effort.