HP V1910 Switch Series User Manual page 468

Figure 429 Configure the PoE port supplying power to AP
 Click to select port GigabitEthernet 1/0/1 1 from the chassis front panel.
 Select Enable from the Power State drop-down list.
 Select the check box before Power Max and type 9000.
Click Apply.

After the configuration takes effect, the IP telephones and AP are powered and can work properly.
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