Function of the ALM CUT button on the system control board

It is used to mute subrack alarms.
If you transiently press this button, the current alarm is muted.
If you press and hold this button for 5s, the audible alarming function is disabled and the ALMC indicator on the system control board becomes steady on. (If you press and hold this button for 5s again, the audible alarming function is enabled and the ALMC indicator on the board is off.)

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