Transmission network clock synchronizing method, equipment and system

Abstract

The invention discloses a transmission network clock synchronizing method and equipment. The transmission network clock synchronizing method comprises the following steps: Delay_Req information is sent to main clock equipment by auxiliary clock equipment and the time t3 of sending the Delay_Req information is taken down; the Sync information sent by the main clock equipment is received, and the time t2 of receiving the Sync information is taken down; the Follow_Up information sent by the main clock equipment is received, wherein the Follow_Up information carries the related time information onthe time t4 of receiving the Delay_Req information by the main clock equipment and the time t1 of sending the Sync information; the clock difference is calculated according to the time t2, the time t3 and the related time information carried by the Follow_Up information; and an auxiliary clock is adjusted according to the clock difference so that the auxiliary clock and a main clock are synchronized. The invention can shortens the time of synchronizing information flow each time to improve the precision of locking the auxiliary clock and the main clock.

Description

technical field [0001] The invention relates to clock synchronization technology in the field of communication, in particular to a method, device and system for transmission network clock synchronization. Background technique [0002] In the field of communication, the concept of "synchronization" refers to the synchronization of the clock frequency of each node in the network, and its error should comply with the relevant standards. [0003] The time synchronization network usually adopts a master-slave clock structure, and the master and slave clocks communicate through a four-message mechanism, such as figure 1 As shown, wherein: t1 is the time when the master clock sends out the Sync message; t2 is the time when the slave clock receives the Sync message; t3 is the time when the slave clock sends out the Delay_req message; t4 is the time when the master clock receives the Delay_req message; The message delay from the clock to the slave clock; Slave_Master_Delay is the me...

AI Technical Summary

Problems solved by technology

Therefore, each adjustment of the frequency of the slave clock is slow and the cycle is long, which is not conducive to improving the locking accuracy of the master-slave clock.

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