3Com Switch 4800G 24-Port Configuration Manual page 1201

In the first case, you can solve the problem by removing the original
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configurations of those configurations.
In the second case, you need to modify some configurations in the PoE
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configuration file.
In the third case, you need to remove the application of the undesired PoE
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configuration file to the PoE interface.
Troubleshooting PoE 1201