China Telecom's fiber distribution box provides broadband connectivity. The receiving box can emit weak light waves that are not harmful to the human body.
The fiber is not radiated, which does not emit the wireless battery by itself but only transmits the signal through the light beam and then passes the light cat to turn the signal into the digital signal. So there is no radiation in this process.
In general, for a house, the strength of the underlying residential electromagnetic field is smaller, and the intensity of the high-level residential electromagnetic field is greater. Corresponding the height of floors , the lower may have weaker signals and the higher may have better signals.