If you're looking for a DC power supply for the PTP 450i, your solution is:
Power over Ethernet midspan, 60 W, -48 VDC Input (N000000L036A)
In addition to the PTP450, this power supply will also be compatable with the new PTP670, when it is released, but at 60W it won’t support a full-power Aux PoE output as well as the radio. This power supply is not, however, compatable with the PTP650 radio due to a conflict with it's PTP-SYNC signaling circuit.