Threshold of the pre-FEC BER that will trigger post-FEC bit errors on LWF boards using the FEC/AFEC function in BWS 1600G devices

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When the pre-FEC BER reaches 10E-7, the system will start bit error processing. (The actual error correction limit of Huawei WDM devices can reach around 10E-5 for G.975-compliant FEC, and reach around 10E-3 to 10E-4 for AFEC.)

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