本文论述综合有线传输网络在城市轨道交通工程中的选择及应用,对目前地铁传输系统的应用也作了分析。传输网综合了轨道交通中通信系统的公务通信、专用通信、电视监控、广播,信号系统的列车自动监控和电力监控、火灾报警、自动售检票以及计算机网络(以太网)等各信息,提供传输通道。并对SDH网的传输特点及统一国际标准化产品作了进一步论述。 This article discusses the selection and application of integrated wired transmission network in urban rail transit project, and analyzes the application of the current subway transmission system. The transmission network integrates various functions such as official communication, dedicated communication, television monitoring, radio automatic monitoring and control of trains in signal system, fire alarm, automatic ticket sales and computer network (Ethernet) and other information in the communication system of rail transit to provide transmission aisle. And further discusses SDH network transmission characteristics and unified international standardization products.