https://en.wikipedia.org/wiki/Power_over_Ethernet
802.3af ( ? 15W )
802.3at ( 30W ? 30W )
two options for power negotiation using LLDP-MED:
1. LLDP Power Via MDI TLV IEEE 802.3-2015
2. Legacy LLDP Power via MDI TLV IEEE 802.1AB-2009
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