为了提高同步数字体系(SDH)信号映射到光传送网(OTN)信号之后在OTN域内的调度效率，提出了一种分组光传送网(POTN)系统架构下的OTN承载SDH(SoO)模型业务映射方式来承载SDH业务。在SoO业务映射模型下，4个同步传输模块(STM-4)信号通过通用帧封装和时钟透传的方式映射到低阶光数据单元(ODU0)，再复用到高阶ODUk传输信号。通过与传统的SDH业务映射OTN信号方式比较，SoO模型可有效提升SDH信号调度效率，为传统方式的2~8倍。采用网络测试方法验证了该映射方式的可行性，同时该方式还具有低功耗、低时延和调度灵活等优点。

In order to improve the scheduling efficiency of the synchronous digital hierarchy(SDH) signal mapped to the optical transport network(OTN) signal in the OTN domain, a new service mapping method SDH over OTN(SoO) model under the packet optical transport network(POTN) system architecture is proposed to carry the SDH service. Under the SoO service mapping model, 4 synchronous transport modules(STM-4) signal is mapped to the low order optical channel data unit (ODU0) through a general frame process and timing transparent transcoding, and then multiplexed to the ODUk transmission signal. Compared with the traditional SDH service mapping OTN signal mode, the SoO model can effectively improve the SDH signal scheduling efficiency, which is 2~8 times that of the traditional mode. The network test method is used to verify the feasibility of the mapping method, and has the advantages of low power consumption, low latency, and flexible scheduling.