指出SDH是一种高速的光纤数据传输系统，主要用于骨干网络的互联，以准东铁路周家湾通信站搬迁施工为例，从SDH设备的原理、优越性、组网原则等方面入手，介绍了SDH在中继传输中的应用，在保证网络安全的前提下节省了设备投资。%The paper points out SDH is the express optical fiber data transmission system, used in the connection of the major network, and introduces the application of SDH in relay transmission by taking the relocation construction of Zhoujiawan communication station along Zhun-Dong railway from the principle, the advantages and the principles of group net of SDH equipment, so as to save the equipment investment with the premise of ensuring the network safety.
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