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Fiber doctor, like a doctor dedicated to optical fibers on a network, provides fast and accurate diagnosis of optical fiber quality, ensuring the healthy running of the network. In a data center interconnect system, fiber issues, such as fiber aging, fiber damages, fiber coiling, large-radius bending, and large pulling stress, may cause large fiber attenuation and high BERs that will consequently impair network operating. As a built-in bidirectional OTDR function, the fiber doctor function of Huawei OptiXtrans DC908 supports automatically positioning the location of fiber abnormal and measure the fiber length, helps maintenance personnel analyze the quality of fiber, which facilitates quick fiber issue diagnosis.