When activating a fiber-optic network, which acceptance-testing stage includes adjusting attenuation levels for the first time?

The stage of acceptance testing that includes adjusting attenuation levels for the first time is during equipment activation. This phase is crucial because it involves the initial setup and optimization of the network components.

During equipment activation, technicians will perform various tests to ensure that the fiber-optic system operates at ideal levels. Adjusting attenuation is a key part of this process, as it ensures that the signal strength meets the required standards for effective data transmission. Proper attenuation levels help to minimize signal loss and enhance the overall performance of the network.

In contrast, the other stages mentioned are less focused on initial adjustments. During installation, the physical setup occurs, but without the fine-tuning of performance metrics like attenuation. Routine maintenance involves checks and repairs on an existing network rather than the initial calibration of new equipment. Customer testing is typically focused on user experience and functionality rather than the technical adjustments necessary for optimal performance, such as attenuation tuning. Thus, the correct understanding of when attenuation levels are adjusted for the first time aligns specifically with the equipment activation stage.