What is weak light ONU？ 

In a PON network, if the overall loss of the ODN exceeds 28dB, the ONU's receiving power will be relatively small. Generally, the ONU's receiving optical power is less than -28dBm, then the ONU has the problem of weak light, and the low power may cause network problems.
#WeaklightONU #ODNloss #Opticalnetworkfailure