Synchronizing signals for ground link transmission is an important issue in packet-switched networks. Traditional synchronization methods, which are mature in circuit-switched networks, are not applicable to packet-switched networks. Although 1588v2 is used to solve the synchronization problem in mobile backhaul networks, more standards need to be considered in light of increased network complexity and rising requirements of equipment clocks. This paper discusses current synchronization methods and gives some views on the application of packet synchronization.%如何解决同步信号地面链路传递问题,是目前分组传送网络中研究的一个重要课题.传统同步体系中的标准仅适用基于电路交叉技术的网络,并不适用于指导分组传送网络中面临的问题.目前虽已有运营商应用1588v2,满足移动回传网络中的时间同步需求,但随着网络复杂性的逐步增强,以及对设备时间(时钟)能力要求的不断提高,亟待相关标准的出台及完善.文章对分组网络中的同步标准进行了讨论,并就当前包交换技术实现频率和时间同步的热点应用给出了建议.
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