Power Over Ethernet (PoE) Operation
General PoE Operation
order. Any remaining power is allocated in the same manner for the Low
priority ports, beginning with module A though the remaining modules. If
there is not enough PoE power for all the PDs connected to PoE modules in
the switch, power is allocated according to priority class across modules. For
example:
All ports on module C are prioritized as Critical.
ProCurve(config)# interface c1-c24 power critical
All ports on module A are prioritized as Low.
ProCurve(config)# interface a1-a24 power low
There are 48 PDs attached to all ports of modules A and C (24 ports each
module).
There is only enough PoE power for 32 ports (8.5 watts x 32 ports = 273
watts).
The result is that all the Critical priority ports on module C would receive
power, but only 8 ports on module A would receive power.
On module A, the port A1 has the highest priority of the ports in that
module if all ports are in the same priority class, which is the case for this
example. Since a minimum 17 + 5 watts of power is allocated per PoE
module, port A1 will always receive PoE power. If another port on module
A had a higher priority class than port A1, that port would be allocated
the power before port A1.
11-13
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