POWER_DIFF_OVER alarm cause

1. Optical signals have too large attenuation during the transmission, or an optical attenuator with high attenuation is added to the local board. As a result, the optical power of the active optical signals at the receive end greatly differs from that of the standby optical signals.
2. The transmit optical power of the active optical signals at the peer site greatly differs from that of the standby optical signals.
3. The detection circuit of the local board is faulty.

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