Device and method for testing of multi-branch optical network

摘要: A multi-branch optical network testing method (or device) is provided to perform a fault isolation test on an that branches off at branch point by number of lines having terminal ends respectively. Herein, pulses are input the network, from which they returned as reflection beams. Then, response beams corresponding mixture converted OTDR waveform data representing whose power gradually decreases in accordance with distance measurement device and has peaks. The subjected logarithmic conversion produce waveform. An approximation least squares effected line, crosses points intersection Fresnel points. Using split into ranges. Attenuation constants repeatedly calculated respect each ranges every time stored storage device. Thereafter, determination automatically performed based attenuation occurrence time, line distance.