PoE power supply priority on an S series switch with insufficient power

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For an S series with insufficient power, if the PoE power supply priority is not set, the switch first provides power for a device connected to an interface with a smaller interface number.

Other related questions:
Check the PoE status on an S series switch
Command for displaying PoE status of S series switches:

<HUAWEI> display poe information
PSE Information of slot 0:
    User Set Max Power(mW)     : 739200     //Set the maximum output power. Use the maximum power by default.
    POE Power Supply(mW)       : 369600     //PoE power supply, which is determined by the PoE power supply configured on the device.
    Available Total Power(mW)  : 369600     //Total available power.
    Total Power Consumption(mW): 0          //Total output power.     
    Power Peak Value(mW)       : 0          //Peak output power.  
    Power-Management Mode      : auto
    Power High Inrush          : disable

<HUAWEI> display poe power interface gigabitethernet 0/0/3
Port PD power(mW)           : 3710          //Output power of the interface.                                           
Port PD class               : 2             //Classes of PDs. The system classifies PDs based on their maximum power.                                           
Port PD reference power(mW) : 7000          //Reference power of the PD.                                   
Port user set max power(mW) : 15400         //Set the maximum output power of the port.                                    
Port PD peak power(mW)      : 3816          //Peak power of the PDs connected to the port.                                          
Port PD average power(mW)   : 3487          //Average power of the PDs connected to the port.    



PoE power module of an S series switch
Configuration and power of PoE power modules on S series switches are as follows: The fixed series switches that have PWR or PWH in their names support PoE. 1. You can use Hardware Query Tool to query the configuration and power of PoE power modules on S series switches. 2. Among modular switches (S7700, S9700, S9300, and S12700), only the S7700 and S9300 support the PoE function. If a switch is running V200R006 or a later version, it allows 800 W AC, 2200 W AC, and 2200 W DC power modules in PoE power slots. If the input voltage is 220 V AC, the PoE power is 800 W or 2200 W. If the input voltage is 110 V AC, the PoE power is 400 W or 1100 W (the S7712 and S9312 do not support 110 V AC). Only ES0D0G48VA00 cards of the S7700 and LE0DG48VEA00 cards of the S9300 support the PoE function. Dual power modules with the same power can be installed to provide power for PDs in load balancing mode. The total power is the sum of two power modules. The number of PoE interfaces supported by a switch is the result of dividing the available PoE power by 15.4 W (802.3af), 30 W (802.3at), or 60 W (802.3bt). Generally, a 250 W power module supports eight interfaces of 15.4 W. A 500 W power module supports 24 interfaces of 15.4 W and 12 interfaces of 30 W. For details, see Tell You About PoE.

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