Allied Telesis x320 Series Installation Manual page 28

Chapter 1: Overview of the x320-10GH Switch
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Example 1:
The x320-10GH switch has three PWR300 units. All ports are Low priority.
The total PD load is 600W. One PSU fails, leaving two PSUs. The
following steps occur:
1. The switch stops providing power to all ports because they are all Low
priority.
2. The software takes a few seconds to recalculate the new power
budget based on the two remaining PSUs.
3. After recalculating the new budget, the switch provides power again to
some of the ports, up to 480W.
Example 2:
The x320-10GH switch has three PWR300 units.
Critical priority PDs - 200W

High priority PDs - 200W

Low priority PDs - 200W

One PSU fails, leaving two PSUs:
1. The switch stops providing power to the Low priority PDs.
2. The software takes a few seconds to recalculate the new power
budget based on the two remaining PSUs.
3. After recalculating the new budget, the switch provides power again to
Low priority ports if the budget allows.
In this example, the new budget would be 480W (two remaining PSUs).
So there would be 80W available for Low priority PDs.