【简答题】
请详述现场接维验收重点
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现场接维验收重点应针对方案符合度、网络性能、ONU设备性能、现场环境、接维材料等几个方面进行。
1．方案符合度验证：根据设计方案逐项核对待验工程相关配置及参数，包括设计方案与现场设备、线路等符合度验证、设备选型、数量、路由交换策略配置情况、链路备份情况、IP地址规划情况、QOS配置情况、VLAN配置情况、现场管线材质等。
2．网络性能验证：在PON宽带验收中必须对网络性能进行测试，主要对带宽、抖动、时延、丢包率、下载速率等参数进行测试，建议在测试中下载速率时需在局端架设FTP服务器，测试带宽、抖动、时延、丢包率、吞吐量等参数时采用标准仪表进行测试。
3．ONU设备性能验证：在PON宽带验收中必须对FTTB类ONU设备性能进行测试，主要对平均发送光功率、平均关断光功率、加电和注册功能、带宽动态分配、单播上网业务上下行带宽控制、断电及断纤告警、全程光衰耗等项目进行测试。光功率达标定义：ONU侧收光达标范围classB为(－8，-25)dBm，classC为(－8，-27)dBm。
4．现场环境验证：对现场环境的验收，主要ONU到用户端的综合布线，含箱体、设备、线缆的标签等，必须对入户线缆进行抽测，具体要求按建设规范进行验收。抽测数量比例不低于30%，对于抽测的线路，要求100%测试通过。
5．接维材料验证：在接维时必须根据接维验收清单逐条确认，有一条未提供完整或与实际建设不符则视为工程接维不通过。
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