Patent ID: 9614612
Date: 2017-04-04
CPC Classifications: H04B,H04Q

Claim:
1. A fast protection switching method for a Passive Optical Network (PON), the method comprising: directing, by a management server, a first optical line terminal (OLT) to operate as a master-mode OLT, and directing a second OLT to operate as a slave-mode OLT; establishing, by the second OLT operating as the slave-mode OLT, prior to a protection switching event, a communication connection to Optical Network Terminals (ONTs), calculating Equalization Delay (EqD) values for the ONTs, and transmitting the EqD values to the ONTs prior to the protection switching event; at the ONTs, storing the EqD values received from the second OLT prior to the protection switching event; at a management server, in response to the protection switching event, instructing the second OLT to switch to a master-mode OLT; at the second OLT operating as the master-mode OLT, instructing the ONTs having transitioned to an idle state due to protection switching to update EqD values thereof; at the instructed ONTs in the idle state, updating the EqD values thereof to be the EqD values received from the second OLT and stored prior to the protection switching event; and terminating protection switching to enable the ONTs to transition to an operation state after completion of said updating the EqD values and to properly communicate with the second OLT operating as the master-mode OLT switched from the slave-mode OLT.