Which performance measurements are included in fiber node acceptance tests?

The performance measurements included in fiber node acceptance tests focus on ensuring that the fiber optic system maintains a high-quality signal throughout its transmission path. The correct answer encompasses measurements such as carrier-to-noise ratio, composite second order, and hum modulation, which are critical for assessing the integrity and quality of the signal being transmitted.

Carrier-to-noise ratio (CNR) evaluates the level of the desired signal compared to background noise, determining how well the fiber links can transmit data without interference. Composite second order (CSO) assesses the signal's intermodulation distortion that can occur when multiple frequencies combine, affecting overall signal quality. Hum modulation examines unwanted variations in signal strength, often introduced by external electromagnetic interference, ensuring that the system can deliver a consistent signal.

These measurements specifically relate to how well the fiber node operates and how it can handle varying conditions, making them essential parameters for acceptance testing. Other options, while relevant in different contexts, focus on different aspects of performance that are not directly part of the acceptance criteria for fiber nodes.