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In a network with elevated complexity that is inundated by invalid alarms, manual evaluation and case handling are no longer a realistic proposition in terms of keeping pace with a growing workload. Any delays in rectifying network faults, directly results in enormous losses to enterprises. Optical Transport Networks are hierarchical, meaning a fault brings massive correlative alarms. Alarm suppression depends on individual, manual experience, which requires one to two hours for root alarm identification. Building on Artificial Intelligence (AI) algorithms —precise fault location of Huawei OptiXtrans DC908 can identify the root cause within three minutes and reduce irrelevant alarms by more than 95%, thereby helping enterprises dramatically reduce losses caused by network faults.