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The development of smart subway services and video cloud drives the bandwidth improvement and architecture upgrade of subway bearer networks. The bandwidth of the bearer ring network will gradually increase from 100G to 200G or even 300G. The network architecture will be compatible with various service transmission modes, such as multicast and one-hop cloud access. In the Smart 300G solution, a 100G gray ring network can be constructed first, and then a 200G colored ring network can be deployed. This solution not only inherits the efficient multicast capability of MRPS, but also supports bearing and bandwidth expansion for one-hop cloud access services. In this way, efficient bearing of subway services is achieved.