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Please refer to the below information:
In the case of ONTs using the GPON upstream transmission: -27 dBm to -8 dBm (Class B+); -30 dBm to -8dBm (Class C+).
In the case of ONTs using the XG-PON upstream transmission: -28dBm to –8dBm(Class N1a); -28dBm to -8dBm(Class N2a).