In a PON FTTx network, which device contains fiber test points to minimize service disruption?

The Fiber Distribution Hub (FDH) is the correct answer because it is specifically designed to manage and distribute fibers to various Optical Network Terminations (ONTs) while providing multiple test points. These test points allow technicians to access the fiber connections without needing to disturb the entire network, thus minimizing service disruptions. By having these points of access integrated within the FDH, any necessary maintenance or fault isolation can be carried out efficiently and effectively, ensuring that services to end-users can continue with minimal interruption.

The Optical Network Termination (ONT) is typically located at the customer's premises and does not provide the same level of access for testing as the FDH. The Optical Line Terminal (OLT) serves as the headend equipment in the network but is generally not configured for field testing in a way that minimizes disruption to overall service. The Splitter Unit is responsible for dividing the optical signals for distribution but also lacks the specific test point functionality that the FDH provides. Hence, the Fiber Distribution Hub is the optimal device for this purpose within the PON FTTx architecture.