阐述城市轨道交通综合监控系统骨干网的3种组网方案，即单环网、独立双环网、级联双环网；分析3种方案各自的特点，讨论网络中不同地点发生故障时的数据流情况。结合目前主流综合监控系统软件平台，论述各自的网卡及切换机制和软件对网络系统的要求。

This paper demonstrates three network options for backbone network of urban rail transit ISCS，namely，single ring network，independent double loop network and cascade double loop network，analyzes their respective characteristics and discusses data stream in case of network failures at different locations． The requirements of respective NIC，switch mechanisms and software for network system according to the current main ISCS software platform are also detailed．

U29-39