Protection group superposition switching method, control apparatus, and optical communication device

A protection group superposition switching method, implemented on a field programmable gate array (FPGA), wherein the FPGA is communicatively connected to a cross-connection chip and a plurality of optical communication units in an optical communication device;

• the cross-connection chip is configured to perform traffic cross-connection for the plurality of optical communication units;
• a plurality of protection groups are formed between the plurality of communication units and each of the communication units of other optical communication devices;
• the protection groups comprise a higher order protection group and a lower order protection group;
• the lower order protection group and the higher order protection group are superimposed to protect the same traffic, and the higher order protection group has priority over the lower order protection group;
• the FPGA communicates with a plurality of protection state machines, and each protection state machine is associated with at least one of the protection groups;
• the method comprises:
• independently performing, by each protection state machine, an automatic protection switching (APS) protocol operation for the at least one protection group pre-associated with the protection state machine;
• updating, according to a result of the APS protocol operation, at least one protection status table for recording a status of each protection group, and updating, according to the protection status table, a cross-connection table for traffic cross-connection between communication units;
• wherein the cross-connection table stores a plurality of cross-connection records, and each cross-connection record corresponds to traffic from a source point to a destination point;
• the source point and the destination point are communication units;
• the cross-connection record comprises a source point field and a corresponding destination point field;
• content of the source point field is index information of the source point, and content of the destination point field is index information of the destination point;
• the protection status table stores protection group records of higher order protection groups and lower order protection groups related to source points and destination points of at least some of traffic;
• each higher order or lower order protection group comprises a working channel and a protection channel;
• each protection group record comprises a working channel field, a protection channel field, and a protection switching status field of a protection group;
• content of the working channel field and content of the protection channel field are indexes of communication units corresponding to the working channel and the protection channel, respectively;
• content of the protection switching status field is information that the corresponding protection group currently works on the working channel or the protection channel;
• and
• configuring the updated cross-connection table into the cross-connection chip, so that the cross-connection chip performs traffic cross-connection according to the updated cross-connection table.