The construction of communication system follows the requirements for well-established technology, affordability and applicability, the need of development, the compliance of network structure to the system operation and maintenance, and the ability of higher network protection and recovery of the transmission system. Based on the existing operation and maintenance management system of Shou~Ping railway communication transmission system and Yi ~ Yang railway, the present engineering communication and transmission system is designed to ensure high business reliability. The review of the widely used subnet connection protection ( SNCP) in the network of transmission system shows that it is applicable in various network topologies with fast switching speed, real-time switching between work channel and protection channel. For this reason, business-based SNCP is selected for network protection of the line transmission system to guarantee higher reliability of communication transmission by means of d double close election, and to improve channel utilization of Yi~Yang line transmission system while the network structure is being optimized.%通信系统的建设遵循技术成熟、经济适用、同时满足发展需要的原则，网络结构满足运营维护管理体制的要求，传输系统必须具备较高的网络保护和恢复能力。基于寿平铁路通信传输系统组网及益羊线既有运营维护管理体制，本次工程通信传输系统组网旨在保证业务的高度可靠。通过参照子网连接保护( SNCP)已广泛用于传输系统的组网案例，其适用于各种网络拓扑结构，倒换速度快，可实时切换工作通道和保护通道。为此，选用基于业务的SNCP作为本线传输系统的网络保护方式，以双发选收的原则保证通信传输业务的高度可靠，并在优化网络结构的同时，一定程度上提高益羊线传输系统的通道利用率。
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