Device and method for realizing clock synchronization

Abstract

The invention relates to a device and a method for realizing clock synchronization. The device comprises an Ethernet interface, a phase-locked loop unit and a clock generation unit, wherein the phase-locked loop unit comprises a logic control circuit, a microprocessor, a digital-to-analogue converter and a voltage controlled oscillator or a direct digital frequency synthesizer. The method comprises the following steps: extracting clock signals; performing phase-locked loop processing on the clock signals; synthesizing local clock signals of which frequencies are regulated into at least two paths of clock signals at the same phase and different frequencies, wherein one path of clock signals is transmitted to the Ethernet interface, while the other at least one path of clock signals is transmitted to Ethernet; and dividing the clock signals received by the Ethernet interface into two paths, wherein one path of clock signals is used as a personal working clock, while the other path of clock signals is transmitted to the Ethernet. In the condition that a fault, blockage, time delay and jitter occur in an Ethernet link and that the clock signals extracted from the Ethernet are lost, the device and the method in the invention can ensure good clock synchronization among communication equipment and services, and can be widely applied to communication systems.

Description

technical field [0001] The invention relates to synchronization technology, in particular to a device and method for realizing clock synchronization. Background technique [0002] With the development of information technology, the communication network can transmit various digital services, from ordinary services to intelligent value-added services, from voice to data, image and other comprehensive services. The coexistence of multiple services makes the synchronization of the system more and more important. Clock synchronization is the basis for communication between various devices in the communication network. If there is no good clock synchronization, there will inevitably be bit errors and slippages during the transmission of digital information, resulting in a decline in communication quality, for example, clicks heard during voice calls, fax services missing information, increased packet loss rate of data services, blurred transmitted images, etc. It can be seen th...

AI Technical Summary

Problems solved by technology

[0007] It can be seen that in the prior art, in the case of failure, congestion, delay and jitter in the Ethernet link, good clock synchronization cannot be achieved between various communication devices and various services

In particular, if the clock signal extracted from the Ethernet is lost, clock synchronization cannot be achieved between communication devices and various services

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