Using Prediction Algorithms to Adjust the Frequency in Case of an Intermittent Synchronization Signal or Switching to Holdover Mode

Precision Time Protocol (PTP) is a key candidate for delivering synchronization signals in packet switched networks. The use of clock signal rejection filters when transmitting a clock signal using the Precision Time Protocol (PTP) through traditional Ethernet packet communication networks leads to the need to use an intermittent clock signal in the frequency adjustment interval, a controlled oscillator (CO). In addition, it should be noted that the periodic transition of the CO into the holdover mode, associated with the loss of the clock signal, can also be regarded as a result of the occurrence of an intermittent clock signal. This article discusses issues related to the possibility of using prediction algorithms to ensure synchronous operation of the CO in the case of an intermittent synchronizing signal, as well as correction of the oscillator frequency drift in the holding mode