This article describes a method for certifying multimode links with 12, 10 or 8 fiber unpinned MPO connectors at each end, using the MultiFiber Pro. You could try and certify the link using a duplex tester such as the CertiFiber Pro, details on how can be found here. But as you will see, the setup process is very involved. The polarity check relies on the technician understanding the three types of polarity; Type A, B and C. With the MultiFiber Pro, polarity is reported automatically.

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