PLANET FGSD-1008HPS - Manual (Page 105)

User’s Manual of FGSD / FGSW Web Smart PoE Switch
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used).
Figure 6-1: Power Supplied over the Spare Pins
The data pairs are used. Since Ethernet pairs are transformer coupled at each end, it is possible to apply DC power to the
center tap of the isolation transformer without upsetting the data transfer. In this mode of operation the pair on pins 3 and 6 and
the pair on pins 1 and 2 can be of either polarity.
Figure 6-2: Power Supplied over the Data Pins