Comment by throwawaypath

>Another thing that should not have happened is installing the cable in loops in this way: any 'building' or 'underground' type cable needs to be of the exact length required at the demarcation point

This is awful advice I would discard immediately. It's poor practice and against code.

When pulling cable, especially fiber, the ends of the cable should be able to reach the fathest corner of the room. Excess cable should be in a service loop, properly secured to a wall, and terminated on a patch panel. Both ends of the cable should follow this rule. That means you're typically pulling cable that's 15m longer or more, depending on the room and configuration.

NEVER buy and pull cable that is the exact size. The cable literally comes from the factory looped up, it's designed to be looped (watch bend radius).

>Loops are definitely allowed though, but that use case is mostly for aerial fiber to enable repair splices

Again, awful advice that's against code. Underground fiber must have service loops at both ends, and must be terminated to a patch panel.