Time synchronization system, management node, and time synchronization method

摘要

A time synchronization system comprises a time master, a time slave, and a management node which are coupled to one another via a plurality of networks. The time master transmits to the time slave a time packet at a given timing through at least one of the plurality of networks. The time slave has a time correcting part for receiving the time packet transmitted from the time master and for correcting time based on the received time packet. The management node has: a network switching determining part for determining whether to switch the network for transmitting a time packet to another of the plurality of networks; and a network switching notifying part for notifying, in a case where it is determined that the network for transmitting the time packet is to be switched, information for identifying the switched-to network to the time slave.

主权项

1. A time synchronization system, comprising:
a time master, a time slave, and a management node which are coupled to one another via a plurality of networks, wherein the time master transmits to the time slave a first time packet at a given timing through at least one network of the plurality of networks, wherein the time slave includes a first processor connected to a first memory that stores threshold information in which a plurality of thresholds are registered for each of the plurality of networks, wherein the first memory further stores instructions that, when executed by the first processor, causes the first processor to execute: a time correction execution feasibility determining part for receiving, through the at least one network of the plurality of networks, the first time packet transmitted from the time master and for determining whether to execute time correction by comparing jitters calculated based on the received first time packet and the thresholds registered for the at least one network, a time correcting part for correcting, when the time correction execution feasibility determines that the calculated jitters are less than the thresholds registered for the at least one network, a time value based on the received first time packet, and wherein the management node includes a second processor connected to a second memory that stores instructions that, when executed by the second processor, causes the second processor to execute: a network switching determining part for determining to switch the at least one network through which the first time packet is transmitted to at least one other different network of the plurality of networks when a failure is detected in the at least one network through which the first time packet is transmitted, and a network switching notifying part for notifying, when the failure is detected in the at least one network, information for identifying the at least one other different network to the time slave, and wherein the time master transmits to the time slave a second time packet through the at least one other different network after the time slave is notified by the network switching notifying part.