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Key features:
802.3af vs. 802.3at
The most popular PoE standard, 802.3af, is used e.g. by IP cameras. The supplying voltage can vary from 44 to 57 VDC and the consumed power cannot exceed 15.4 W. The 802.3at version allows for powering devices with DC voltage within 50...57 V range, which consume up to 25.5 W. This group of devices includes printers, IP PTZ cameras, switches.
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