The indicator light on an optical module is designed to show the status of the optical signal, typically indicating whether the module is transmitting and receiving properly. If the module is functioning normally, the light is usually green or steady, signaling a healthy link. However, the light's behavior can vary depending on the type of failure and the device's monitoring system .
In devices like xPON ONU, a malfunctioning optical module often causes the optical signal indicator light to stay red, signaling that the device is not receiving a normal optical signal, even if the fiber cable is intact . This shows that the indicator light is not always a reliable sign that the module is fully operational.
The indicator light may remain on, turn red, or blink depending on the type of optical module failure. While it provides a quick visual cue, it does not guarantee that the module is transmitting or receiving signals correctly. Proper testing and inspection are required to confirm the module's operational status.
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