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SDH设备中PPI(PDH物理接口模块)的作用是提供设备与PDH线路的接口、提取PDH定时信号、提供码型转换功能。( )
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发布时间: 2023-11-19 12:37
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SDH设备中PPI(PDH物理接口模块)的作用是提供设备与PDH线路的接口、提取PDH定时信号、提供码型转换功能。( )
A.对
B.错
正确答案是A
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