The paper presents the function of tandem connection in SDH system, the process for HOVC payload overhead byte N1.And finally, the paper give an example to show how to configure the TCM function on engineering.

• 介绍了SDH系统中串接链路(TC,TandemCon-nection)的功能,通过介绍高阶通道开销中N1字节的处理方式,具体说明了TCM功能的实现方法。 并通过举例说明了TCM功能在工程上的使用方法。