It is used to clear the alarm output signal. After the alarm output signal is cleared, the recovery notification is sent to the external alarm interface and the corresponding active alarm is cleared. For the current external alarm interface, only the one-LED and three-LED output mode is supported. In the one-LED output mode, the alarm output signal cannot be cleared by level and can be cleared only by all(1); In the three-LED output mode, the alarm output signal can be cleared by all the following parameters. Options: 1. other(-1) -indicates the default status in the system. 2. all(1) -indicates that all the alarm output signals are cleared. 3. critical(2) -indicates that the critical alarm output signal is cleared. 4. major(3) -indicates that the major alarm output signal is cleared. 5. minor(4) -indicates that the minor alarm output signal is cleared.