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文章研究了通信系统双机热备份要实现的目标、技术机制和不同技术机制的应用场合。并结合实际系统设计，着重阐述了通信系统基于主备用方式的双机热备份技术及其实现，描述了导致双机切换的条件以及各工作模式下的状态演变。
This paper studies the target, technical mechanism and application of different technical mechanisms to achieve dual system hot backup in communication system. Combined with the actual system design, this paper emphatically expounds the dual-system hot backup technology and its implementation based on the master and backup mode of the communication system, and describes the conditions leading to the dual-plane handover and the state evolution under each working mode.