This parameter is applicable for an APEX where chassis redundancy is enabled. The APEX configured as primary will report the following values: active(1): Primary RF outputs are active. standby(2): Primary RF outputs are muted. Waiting to become active. fault(3): Primary has experienced a fault. suspend(4): Primary is suspended. The APEX configured as secondary will report the following values. These are based on its knowledge about the primary APEX from heartbeat messages. unknown(0): State of primary is not known (heartbeat not received). active(1): Primary RF outputs are active. standby(2): Primary RF outputs are muted. Waiting to become active. fault(3): Primary has experienced a fault. suspend(4): Primary is suspended.