Patent ID: 8724453

Claim:
A method for implementing trunk optical fiber protection in Ethernet Passive Optical Network (EPON), comprising: activating an optical module at a master Passive Optical Network (PON) port, deactivating an optical module at a standby PON port, configuring a service for the master PON port, and synchronizing static data and dynamic data to the standby PON port; synchronizing and adjusting a value of a Multi-Point Control Protocol (MPCP) counter at the standby PON port according to a value of an MPCP counter at the master PON port, comprising: A: adjusting the value of its own MPCP counter by the standby PON port itself to be synchronous with the value of the MPCP counter at the master PON port according to the values of the MPCP counters at the master and standby PON ports when receiving a synchronous signal, B: determining a path difference between the standby PON port and the master PON port according to a value of an MPCP counter at an Optical Network Unit (ONU) when the ONU sends the MPCP frame and the values of the MPCP counters at the master and standby PON ports when the MPCP frame arrives at the master and standby PON ports respectively; and adjusting the value of the MPCP counter at the standby PON port to be slower by the path difference than the value of the MPCP counter at the master PON port; and carrying out fault detection, if a fault occurs, transmitting an operating state to the standby PON port and performing a master-standby switch of the PON ports.