Passive optical network and protection switching method thereof
A passive optical network and protection switching technology, which is applied in the communication field, can solve the problems of complex process, slow recovery speed, poor applicability, etc., and achieve the effect of simplifying the switching process and reducing the switching time
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[0044] Such as figure 2 As shown, in the topology structure of the passive optical network in the way of protecting the backbone optical fiber, the path from the first optical line terminal OLT1 to the ONU through the optical splitter is the main path, and the second optical line terminal OLT2 reaches the ONU through the optical splitter The path is an alternate path. The main channel is used as the service channel of the optical network unit and the optical line terminal. For the communication between the network unit and the optical line terminal, after the ONU detects the downlink optical signal of OLT2, the ONU and the OLT use signaling interaction to complete the update of the ONU’s equalization delay (EqD) value, such as image 3 shown.
[0045] If the ONU detects signal loss or frame loss (LOS or LOF), or detects the downlink optical signal of OLT2 after enabling the backup path, it automatically adjusts the value of its own EqD, and increases the equalization time d...
Embodiment 2
[0055] Such as Figure 4 As shown, the protection switching method in the passive optical network of the present invention includes the following steps:
[0056] Step 401: All ONUs automatically adjust the value of their EqD, and the value of EqD after the ONU update is equal to the value EqD1 before the ONU update plus a delay constant D (D>0, preferably D≥250us);
[0057] Step 402: OLT2 continues to allocate uplink bandwidth to each ONU according to the method in the prior art;
[0058] Step 403: ONU sends uplink data according to the updated equalization delay EqD1+D within the uplink bandwidth allocated to itself by OLT2, so as to realize uplink data synchronization;
[0059] Step 404: After receiving the upstream frame sent by the ONU, OLT2 calculates the equalization delay adjustment value ΔEqD that the ONU needs to adjust according to the following method, and sends the ΔEqD to all ONUs;
[0060] Wherein: ΔEqD=the actual arrival time of the ONU uplink frame−the expect...
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