Tycon Power Passive POE to 802.3af /at Converter - 24 V DC Input - 56 V DC, 625 mA Output - 35 W

The TP-POE-2456D is a unique Power Over Ethernet adapter which converts a 24VDC passive POE input to an 802.3af/at 56VDC POE output. The only connections required are CAT5/6 cables. The IEEE 802.3af/at compliant POE output is capable of up to 35W power output. The POE input is 22V to 36VDC passive POE so the TP-POE-2456D is perfect for running IP POE Cameras or other POE devices from passive POE switches like the Tycon TP-SW5G-NC/TP-SW8-NC or Ubiquiti TOUGH Switch™.

The units supply power to the remote device on the unused Ethernet pins 4,5(V+) and 7,8(V-). The Ethernet spec supports distances up to 100m (328 feet).
They have various protections for surge, short circuit, overload and overvoltage.