When testing with the wavelength of 1310nm, 1490nm, and 1550nm of ordinary OTDR, it is necessary to require that there is no communication light signal in the measured line. Forcibly Live Testing will burn the internal detector of the OTDR. Live testing is when testing, you can stop the light signal in the line, and OTDR can still complete the test.

Light decay generally refers to its luminous flux. When charging the surface of the photosensitive drum, as the charge accumulates on the surface of the photosensitive drum, the potential continues to increase, and finally reaches the "saturation" potential, which is the highest potential.

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