How to calculate the power each ONU should receive based on its distance and its splitter, and when the gap from the measured value becomes an outside plant problem.
When a PON port goes down, the NOC doesn't need 38 alerts. How to group symptoms under their cause and what information that single notification has to carry.
An ONU's power rarely drops all at once: it declines over weeks. Which series are worth forecasting, how much data you need and why a forecast doesn't replace an alert.