The BPI-7402 series of modules are designed to extract power from a conventional twisted pair Category 5 Ethernet cable, conforming to the IEEE 802.3af and IEEE 802.3at Power-over-Ethernet(PoE) standard.it is 30W POE PD Module ( Isolation Model),The BPI-7402 signature and control circuit provides the PoE compatibility signature and power classification required by the Power Sourcing Equipment (PSE) before applying up to 30W power to the port.
BPI-R64 with BPI-7402 PoE module:
more about 7402 ,please see wiki page: