Table 6: Denial Of Ports By Priority - Allied Telesis x320 Series Installation Manual

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The x320-10GH switch does not use Dynamic Power Management (DPM).
Therefore, the software cannot detect a failure of the PSU and decide
which ports to deny power to. As a result, more ports may be powered
than the unit can restart due to lack of power. In this case, the switch will
deny Low priority ports and to attempt to repower once the CPU has
determined the new power budget. The hardware is connected to provide
the signal based on the number of Power Good indications and
configuration for the software about how many PSUs are required.
The user must designate the ports that should not be reset on the PSUs
failure as High or Critical, because Low priority ports will be shutdown
(either immediately or as a result of rebudgeting). The default PoE priority
for the ports is Low. See "PoE Port Priorities" on page 23 for more
information.
The switch will deny Low priority ports when:
A PSU fails.

A PSU fails and the maximum power used for budgeting is equal to or

less than the new number of PSUs connected.
Both modes allow redundant operation. In both, the ports should be
configured to higher priorities to ensure they do not lose power on
subsequent PSU failures. The difference between the two is that in the
second mode the user is prevented from powering too many ports in the
first place by the Max Budget, which leaves a PSU as a spare.
The software will operate in a mode of operation where the denial of ports
depends upon how many PSUs are connected as shown in Table 6. The
user must configure ports to Critical and High priority and the total wattage
for either should be no more than 240W.
Table 6. Denial of Ports by Priority
Original Number of
PSUs Powered
3
2
1
This behavior is not configurable beyond the user configuring Critical, High
and Low priorities. By configuring the port priorities or making full use of all
the available power, the user gets a constant mode of operation that
enables redundant configuration. The software changes the ports that shut
down at each stage of PSU failure.
Changing from PSUs
Powered
3 > 2
2 >1
1 > 0
x320 Series Installation Guide
Priority of Ports
Denied
Low
High and Low
System will shut down