用于线路纵差保护的PTN时分复用业务时延分析

摘要

PTN承载的时分复用业务具有显著随机性，利用此类业务传输线路纵差保护数据需要全面分析业务时延和通道不对称性。在全面分析业务时延形成机理的基础上，建立了时延模型，该模型包含固定时延和随机时延两种分量。给出了数据分组随机时延的数值仿真方法，该方法可用来研究以太网帧长、带宽占用率和路径跳数等不同条件下的时延分布特征。定量分析了PTN承载时分复用业务对线路纵差保护通信需求的适应性。研究成果具有工程参考价值。%The time division multiplexing service carried by packet transmission network (PTN), has significant stochastic characteristic. When this kind of service is used for data transmission of line longitudinal differential protection, it is necessary to make the comprehensive analysis on service delay and channel asymmetry. By analyzing the mechanism of delay time, a delay model including deterministic component and stochastic component is established. Considering Ethernet frame size, bandwidth usage and path hops, the numerical simulation method for stochastic delay of data packets is given. This method can be used to study on time delay distribution characteristics under different conditions. Combined with the communication requirements of line longitudinal differential protection, the adaptability of time division multiplexing service carried by PTN is analyzed quantitatively. The research results have reference value for engineering.