Adjust the PoE output voltage on an S series switch

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The PoE power supply voltage on an S series switch is in the range from 44 V to 57 V, and the typical value is 48 V.
The PoE power supply voltage complies with IEEE 802.3af and IEEE 802.3at, and cannot be changed.
For more information, see Tell You About PoE.

Other related questions:
What is the PoE output voltage of an AR1200
The output voltage of the PoE interface is 48 V. The standard PD converts 48 V voltage into its voltage, and a non-standard PD must connect to a PoE splitter to convert 48 V voltage into its voltage.

What is the PoE output voltage of AR1200 series
The PoE output voltage is 48 V. The standard PD converts 48 V voltage into its voltage, and a non-standard PD must connect to a PoE splitter to convert 48 V voltage into its voltage.

How is PoE of an S series switch compatible with non-standard PDs
PoE of an S series switch is compatible with non-standard PDs as follows: When a non-standard PD is connected to a switch, the switch cannot detect proper resistance and identify the PD. 1. You can enable the compatibility check function so that the switch can detect PDs that do not comply with 802.3af or 802.3at standard and provide power to these non-standard PDs. - Run the poe legacy enable command in the interface view to enable a switch to check compatibility of the non-standard PDs. 2. If a PD supporting 48 V PoE cannot be powered on, you can run the poe force-power command in the interface view to forcibly power on the PD. 3. Some non-standard PDs support low current in compliance with 802.3af, but not high current in compliance with 802.3at. - Run the poe af-inrush enable command in the system view to modify the PoE power supply mode to low current in compliance with 802.3af. - After the configuration, remove and then reinstall the non-standard PD so that the PD can be powered on normally. - The configuration takes effect on the switch or some slots, which may affect 802.3at-compliant PDs powered on at high current. Exercise caution when running this command. For details, see Tell You About PoE.

Enable and disable PoE on an S series switch
Enable or disable the PoE function on S series switches:

1. By default, the PoE function is enabled on an interface
2. Enable or disable PoE power supply.
<HUAWEI>system-view
[HUAWEI]interface gigabitethernet 1/0/0
[HUAWEI-GigabitEthernet1/0/0]undo poe enable  //Disable PoE power supply.
[HUAWEI-GigabitEthernet1/0/0]poe enable       //Enable PoE power supply.

The downlink electrical interfaces of PoE switches support PoE power supply, with up to 30 W power on each interface. The maximum power supply distance is 100 m.
Only ES0D0G48VA00 (S7700)/LE0DG48VEA00 (S9300) cards of modular switches (S7700/S9700/S9300/S12700) support PoE power supply.

If the switch connects to 48 V standard PoE powered devices but cannot negotiate power supply capabilities with the devices, you can run poe force-power on the interfaces to forcibly power on the devices.


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