求翻译：OAM管理完成ONU的认证、配置、在线的性能监测、各种故障告警和远端故障指示、远端近端环回等功能，OAM是OLT对ONU进行远程管理通信协议，有一定的开放性和扩展性是什么意思？

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ONU OAM Management completed the certification, configuration, online performance monitoring, various failure alarm and remote troubleshooting instructions, remote near-end ring back, and other functions, the ONU OLT OAM is a remote management communication protocol, there is a certain degree of ope

OAM management complete the accreditation of ONU, line configuration, performance monitoring, fault alarm, and remote fault indication proximal and distal circular features such as OAM is the OLT to ONU for remote management communication protocol, a certain degree of openness and extensibility