Time synchronization method and system

摘要

Disclosed are a time synchronization method and system. The method comprises: an NE1 and the upstream nodes of the NE1 are classified into the first level, and the downstream nodes of the NE1 are classified into the second level, where the first level priority of the first level is higher than the second level priority of the second level; an NE3 connected to the NE1 through a PTP synchronization link in the downstream node receives a first device priority of the NE1 and the first level priority from the NE1; and after the NE3 receives the second device priority of an NE2 and the second level priority sent by the NE2 in the downstream nodes which is connected to the NE1 through the 1PPS+TOD synchronization link, determines that a clock parameter of the NE1 is optimal, and synchronizes the local clock to the NE1.

主权项

1. A time synchronization method, comprising:
classifying a first Network Equipment (NE1) and upstream nodes of the NE1 in a time network into a first level, and classifying downstream nodes of the NE1 into a second level, wherein a first level priority that needs to be used in time synchronization of the first level is higher than a second level priority that needs to be used in time synchronization of the second level, and an output port of the NE1 is connected to a 1 Pulse per Second+Time of Day (1PPS+TOD) synchronization link; receiving, by a third Network Equipment (NE3) in the downstream nodes which is connected to the NE1 through a Precision Time Protocol (PTP) synchronization link, a first PTP announce message from the NE1, wherein the first PTP announce message carries a first equipment priority of the NE1 and the first level priority; and after the NE3 receives a second PTP announce message sent by a second Network Equipment (NE2) in the downstream nodes which is connected to the NE1 through the 1PPS+TOD synchronization link, determining that a clock parameter of the NE1 is optimal according to the first PTP announce message and the second PTP announce message, and synchronizing a local clock to the NE1 according to the first PTP announce message, wherein the second PTP announce message carries a second equipment priority of the NE2 and the second level priority, and the first equipment priority is higher than the second equipment priority.