During which acceptance-testing stage do adjustments to attenuation levels typically occur?

Adjustments to attenuation levels typically occur during the equipment activation stage. This phase involves bringing the fiber optic system online for the first time and ensuring that all components are functioning correctly. During activation, technicians conduct tests to measure various performance parameters, including attenuation, which refers to the loss of signal strength as it travels through the fiber. If the attenuation levels are found to be outside acceptable ranges, adjustments can be made to optimize performance, such as repositioning connectors or ensuring proper splicing techniques.

The other stages mentioned do not involve this specific activity. Prior to installation, focus would be more on planning and preparations rather than adjustments. Post-installation review mainly involves assessing the installation process and outcomes but is less about making adjustments to the system. Troubleshooting is generally reactive, addressing issues after they have been identified rather than proactively adjusting levels during the initial setup and activation of equipment.