A clock synchronization method and synchronization system

Abstract

The invention discloses a clock synchronization method and a synchronization system, belonging to the technical field of clock synchronization. The method includes: timestamping the input clock sourceon the line, and generating a first clock source by self-oscillation on the line, monitoring the input clock source and judged whether the input clock source is valid, If yes, storing the resulting timestamp samples in the lock clock buffer, restoring a timestamp in the locked clock buffer to a second clock source, and based on the pre-design-time cycle, reading the latest timestamp sample and storing in the hold clock buffer, if invalid, restoring the timestamp in the hold clock buffer to the third clock source, so that the third clock source can be selected as the output clock source in theabsence of the second clock source, so that the current line can still have a valid output clock source. The clock synchronization method of the invention improves the reliability of the clock synchronization on the circuit through the redundancy design.

Description

technical field [0001] The present invention relates to the technical field of clock synchronization, in particular to a clock synchronization method and a synchronization system. Background technique [0002] In a synchronous system, clock synchronization between network elements needs to be achieved. It is required that the downstream network element can realize clock synchronization with the upstream network element, that is, the upstream provides a reliable clock source, and the downstream can restore a clock with the characteristics of the clock source through a certain algorithm. Currently, clock synchronization between network elements is implemented through a clock locking mode. [0003] However, at present, clock synchronization is usually implemented through a locked mode. When the clock of an upstream network element fails and becomes invalid, the clocks of all downstream network elements cannot synchronize time. Contents of the invention [0004] In order to ...

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Problems solved by technology

[0003] However, at present, clock synchronization is usually achieved through the locked mode. After the clock of the upstream network element fails and becomes invalid, the clocks of all downstream network elements cannot be synchronized.

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