In what situation are power alarms generated on the S5700

When the S5700 has only one power input, the following alarm is generated:
display alarm urgent
Alarm:

Alarm Slot Date Time(DST) Location
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Power abnormal 1 2008/10/01 00:00:48 Slot 0 When the S5700 has two power inputs, no alarm is generated.
display alarm urgent
Alarm:

Alarm Slot Date Time(DST) Location
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When one of the power inputs is cut off, a "power abnormal" alarm is generated. When this power input is recovered, a "power resume" alarm is generated.
display alarm urgent
Alarm:

Alarm Slot Date Time(DST) Location
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Power resume 1 2008/10/01 00:02:54 Slot 0
Power abnormal 1 2008/10/01 00:02:49 Slot 0
Power resume 1 2008/10/01 00:02:21 Slot 0
Power abnormal 1 2008/10/01 00:02:08 Slot 0

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