It's an indication that the fiber team might need to check the link for high loss or perform maintenance to improve the optical power. A good, healthy power reading should stay between -8 dBm and -25 dBm. Once you're hitting -28 dBm or below, you're entering the danger. Optical fiber loss refers to the decrease in optical power due to absorption and scattering after optical signals are transmitted through optical fibers. When implementing optical fiber communication, a key challenge is minimizing the loss of signals within the fiber. That shows that the device is receiving power correctly. “PON” stands for Passive Optical Network. At this. The fiber optic transceiver has 6 LED instructions that show the operating status of the transceiver and, as shown in LED, can determine whether the transceiver is working properly and what might be the problem, thus helping to identify the fault. Their function and fault determination are as. Understand what the indicator light of the fiber media converter means? 1000M-when it is on, it means 1000M speed 100M-when it is on, it represents 100M speed FX/Act-when it is on, it means that the pigtail has been connected, and when it is flashing, it means that data is being transmitted.