Patent ID: 8515276

Claim:
A method for optical network switching protection, comprising: selecting, by a standby optical central office end apparatus, one optical terminal apparatus as a ranging optical terminal apparatus after a service is switched from an active optical central office end apparatus to the standby optical central office end apparatus; obtaining, by the standby optical central office end apparatus, a delay difference between a delay from the ranging optical terminal apparatus to the standby optical central office end apparatus and a delay from the ranging optical terminal apparatus to the active optical central office end apparatus; delivering, by the standby optical central office end apparatus, the delay difference to all optical terminal apparatuses in a multicast manner, so that each optical terminal apparatus calculates Equalization delay (EqD) between the optical terminal apparatus and the standby optical central office end apparatus according to the delay difference respectively, and sets the calculated EqD; and synchronizing, by the standby optical central office end apparatus, a time at which data sent by all the optical terminal apparatuses reaches the standby optical central office end apparatus according to the delay difference.