An unusually high transmit-power alarm is less common than low, but matters on systems with tunable or variable-power optics: exceeding this threshold can indicate a laser control loop malfunction that risks damaging the far-end receiver's photodiode or violating the fiber link's power budget for that specific span. For example, a threshold of 2000 microwatts, about plus 3 dBm, tripping on an optic that should be running around 1000 microwatts would suggest its power control loop has failed to regulate output.