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当同步一个DP83640 PTP 主时钟到GPS时,有什么方案可以解决GPS掉线后,主时钟的守时的问题?

Other Parts Discussed in Thread: DP83640

在AN-2006里有两种以DP83640同步到GPS做为主时钟的方案,但都没有提供解决GPS掉线时,本地时钟如何尽可能精确地运行尽可能长的时间 方案,请问,有这方面的考虑没?