A phase lock loop adjusting method and device for adjusting phase lock loop

Abstract

The invention belongs to the digital communication technical field and provides a method for adjusting the phase-locked loop and the device of phase-locked loop. For concreteness: the real-time measurement for quality is done, and calculates the phase difference between the reference time and the local time, if the phase difference is bigger than the second presetting phase difference, the judge is degraded, and the detection goes on until the phase difference is smaller or equal with the second presetting phase difference, and select the fast repairing parameter, if the said phase difference is bigger than the first presetting phase difference, and chooses one fast repairing parameter whose damp coefficient is smaller than the presetting, and if the said phase difference is smaller or equal with the first presetting phase difference, and switch one fast repairing parameter whose damp coefficient is bigger than the presetting. Using the invention, it can reduce the time of entering lock, eliminate the shake of input phase effectively, and when the reference clock is degraded, the local time do not trace to ensure the quality of reference clock.

Description

technical field [0001] The invention relates to the technical field of digital communication, in particular to a method for adjusting a digital phase-locked loop and a device for adjusting the phase-locked loop. Background technique [0002] With the wide application of various communication systems on public telecommunication networks, the scale of the network is getting larger and the network environment is becoming more and more complex, especially for various edge networks such as wired access networks and wireless access networks, the network environment It is more complicated, for example, the transmission network relied on includes SDH (Synchronous Digital Hierarchy, synchronous digital system), PDH (Pseudo-synchronous Digital Hierarchy, quasi-synchronous digital system), digital microwave and even SDH / PDH hybrid network. At present, the transmission network is basically based on SDH. Although SDH has its unique broadband, strong self-healing ability, and powerful net...

AI Technical Summary

Problems solved by technology

In addition, when switching the clock reference source, the quality of the reference source is not checked first, which will cause the local clock to track when the quality of the reference source is poor, resulting in worse local clock, deterioration of the clock provided to the system, or even unusable

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