Why a PoE card fails to be registered on S series switches


The ES0D0G48VA00 card is the PoE card for the S12700 and S7700, and the LE0DG48VEA00 card is the PoE card for the S9300. Possible causes of a PoE card registration failure are as follows:
No PoE power module is installed in the PoE power slot of the switch.
The PoE power module is not powered on.
The dual in-line memory module (DIMM) is faulty. For the handling methods, see "Fault Locating Guide - Card Registration Failure" in Huawei S Series Campus Switches Maintenance Guide.

Other related questions:
Why does a subcard fail to register on a switch
The possible causes are: The switch does not support the subcard. The subcard is not hot swappable and can register successfully only after the switch restarts. The subcard is not in a good contact with the backplane. The system version of the switch needs upgrading. NOTE: When this occurs, send the bar code of the subcard and switch version information to Huawei technical personnel so that Huawei can fix the problem quickly.

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]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.

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.

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