PoE are off board / external devices (AC input Voltage) that provides both voltage and current along with data over Ethernet cabling.
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Laird Technologies offers off-line PoE power supply inserter/injector from 16.2W ~ 19.2W.
Pricing and Availability
Phihong Usa offers AC/DC 1, 2, 4, 8, 16, and 24 port PoE midspan Injectors from 15.4W to 95W.
SL Power Electronics offers AC/DC PoE power injectors with 15.4W to 32W outputs.