![]() Optical attenuator, is a passive device used to reduce the power level of an optical signal. But even after we add enough optical attenuation, the CATV light is still not working. If PON port output optical power is too large, ONT may not receive the PON signal, thus also can not receive CATV signal. We guess if PON port output optical power range around 2~5dbm is too large, thus at lease 15 ~20dbm optical attenuator needs to be added on GPON ports, since the PON port sensitive on ONT is below -10~-20dbm. ![]() But the test shows CATV generator signal is correct.Ģ, Secondly, we check and find one more problem ONT LOS light on HG8247H5 is in RED. ![]() Customer reported that ONT HG8247H5 is working smoothly but only CATV light is not working.ġ, First, to avoid CATV signal through splitter has some problem, it is suggested to plug CATV generator signal directly into ONT and then to check whether CATV light will turn on if not, it is confirmed that CATV signal is not correct.
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