What is the purpose of the "FDR Synch" button in the BME NOC's DTM while using M580 HSBY System

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In a HSBY system, the FDR servers of the paired BMENOC's are automatically synchronized.
You can remove the auto-synch by disabling this service in the DTM.
If, for some reason, you want to manually re-sync the servers, you can do it by pressing this button.
Note that it will also reactivate the auto-sync, as this is the normally recommended sync mode.