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Grp Smoke Alrm. Share smoke alarms among the Systems in this Group. If the Group Smoke Alarm setting is On, all Systems in the Group will shut down if a smoke alarm occurs in one System. NetworkAIR FM DX 60 Hz Operation, Maintenance, and Troubleshooting Comm Loss Failover. Decide if the Group considers a System in the Comm Lost state to be in a failed state. • Off—The Group will assume that the System is still operating normally. • On—A backup System will be moved to the online state. Caution: I