Abstract: This paper analyzes the hidden danger sand causes of giant network in railway transmission system, proposes to set DCC transparent transmission to solve the problem of giant ECC network, and to solve the hidden dangers that may lead to abnormal switching of two-fiber shared multiplex section protection ring (MSP) after subnetting. Trough the detailed analysis of the actual situation of the railway network, the advantages and disadvantages of DCC transparent transmission are summarized to provide reference for the networking application in the later stage.

Key words: multiplex section protection ring, ECC subnetting, DCC transparent transmission

摘要： 通过分析铁路传输系统中巨型ECC网络可能导致的隐患及原因，提出设置DCC透传解决巨型ECC网络问题，并解决子网划分后可能导致二纤共享复用段环(MSP)的保护倒换异常的隐患。结合铁路实际组网情况给予详细分析，归纳出DCC透传的利与弊，为后期铁路上的组网应用提供相关参考。

关键词: 复用段保护环, ECC子网划分, DCC透传