本文主要阐述了子网连接保护（SNCP）的工作原理及J1字节的详细定义，并对J1字节在SNCP保护中的处理方法进行了具体分析。
The paper briefly introduces the principle of sub-network connection protection and the definition of J1 byte. On the ground of that, analyzes the application of J1 byte in the SNCP.
本文主要阐述了子网连接保护（SNCP）的工作原理及J1字节的详细定义，并对J1字节在SNCP保护中的处理方法进行了具体分析。
The paper briefly introduces the principle of sub-network connection protection and the definition of J1 byte. On the ground of that, analyzes the application of J1 byte in the SNCP.
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