Hp 2910AL User Manual download pdf (Page 256)

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101

Power Over Ethernet (PoE+) Operation

PoE Operation

■ Configure per-port priority for allocating power in case power is

oversubscribed. Power for some lower-priority ports is dropped to

support the demand on other, higher-priority ports.

■ Configure a global power threshold. This setting acts as a trigger for

sending a notice when the PoE power consumption crosses the

configured global threshold level. (Crossing the threshold level in

either direction—PoE power usage either increasing or

decreasing—triggers the notice.) The default setting is 80%.

Note The ports support standard networking links and PoE links. You can connect

either a non-PoE device or a PD to a port enabled for PoE without reconfig-

uring the port.

PD Support

The internal power supply for the switches covered in this guide provides up

to 382 watts of power. Depending on the amount of power the power supply

device delivers to PoE ports, there may or may not always be enough power

available to connect and support PoE operation on all 24 Gig-T ports. When a

new PD connects to a PoE port and there is not enough power left to allocate

to that port:

• If the new PD connects to a port “X” having a higher PoE priority than

another port “Y” that is already supporting another PD, then the power

is removed from port “Y” and delivered to port “X”. In this case the

PD on port “Y” loses power and the PD on port “X” receives power.

• If the new PD connects to a port “X” having a lower priority than all

other PoE ports currently providing power to PDs, then power is not

supplied to port “X” until one or more PDs using higher priority ports

are removed.

In the default configuration (usage), when a PD connects to a PoE port and

begins operating, the port retains only enough PoE power to support the PD’s

operation. Unused power becomes available for supporting other PD connec-

tions. However, if you configure the poe-allocate-by option to either value or

class, then all of the power configured is allocated to the port.

Disconnecting a PD from a PoE port causes the switch to stop providing PoE

power to that port and makes the power available to any other PoE ports that

have PDs connected and waiting for power. If the PD demand for power

becomes greater than the PoE power available, then power is transferred from

the lower-priority ports to the higher-priority ports. (Ports not currently

providing power to PDs are not affected.)

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