Patent ID: 8335437
Filing Date: 2012-12-18
Classification: H04J,H04Q

Abstract:
1. A time synchronization method in a passive optical network (PON), the PON comprising an optical line terminal (OLT) and a plurality of optical network units (ONUs), the method comprising: receiving, by an ONU, a synchronization packet sent by the OLT after a time synchronization of the OLT with a master clock (MC) is achieved, wherein the synchronization packet comprises a timestamp TMt wherein the frame sequence number of the first downlink frame is a value obtained from an OLT superframe counter in a Gigabit PON (GPON) or a value obtained from an OLT timestamp counter in an Ethernet passive optical network (EPON); adjusting, by the ONU, a local clock according to the timestamp TMt instructing, by the ONU, a slave clock (SC) to perform a time synchronization with the ONU.