Time synchronization method and device in passive optical network and passive optical network

摘要

A time synchronization method and a time synchronization device in a passive optical network (PON), and a PON are provided. The method includes receiving a synchronization packet sent after time synchronization of an optical line terminal (OLT) with a master clock (MC) is achieved, wherein the synchronization packet carries a timestamp TMt1i determined after the time synchronization of the OLT is achieved, adjusting a local clock according to the timestamp to achieve time synchronization of an optical network unit/optical network terminal (ONU/ONT) with the OLT, and after the time synchronization of the OLT is achieved, instructing an slave clock (SC) to perform time synchronization. A time synchronization device and a time synchronization system for implementing the method in a PON are further provided.

主权项

1. A method for time synchronization in a passive optical network (PON) comprising an optical line terminal (OLT) and a plurality of optical network units (ONUs), the method comprising:
obtaining, by the OLT, a timestamp TMtli associated with a first downlink frame from the OLT to an ONU and a frame sequence number of the first downlink frame, wherein the frame sequence number is a value derived from a superframe counter; sending, by the OLT, the timestamp TMtli and the frame sequence number via an ONU Management and Control Interface (OMCI), wherein the timestamp TMtli and the frame sequence number are used for time synchronization between an ONU and the OLT.