44Connecting an external PoE power supplyTo supply PoE power to S7502E or S7503E-S, a PoE power cable is required to connect the external PoEpower supply to the PoE input on the chassis rear panel. You can use an H3C RPS800-A or other DCpower supplies that can satisfy PoE input requirements: voltage range –46 V to –57 V (–52 V to –57 Vfor type 2) and maximum current 40 A, as the external PoE power supply.CAUTION:• If you use an RPS800-A as the external PoE power supply, H3C recommends you to use PoE powercables (optional, ordered with the RPS800-A) provided by H3C.• To ensure steady operation of the switch, when you use your own PoE power cable, make sure the crosssection of the cable is no less than 8.4 mm2 (0.01 in 2 ) and the power cable can carry 50 A current.Connecting the RPS-800A to the switchFollow these steps to connect the RPS-800A to the switch:Step1 Remove the blank panel covering the PoE port of the switch.Step2 Connect the OT terminal (with a – sign) on the blue wire to the NEG(–) terminal on the PoE power supplysocket, and fasten the captive screw. Connect the OT terminal (with a + sign) on the black wire to theRTN(+) terminal on the PoE power supply socket, and fasten the captive screw.Step3 Install the blank panel to the PoE port.Step4 Connect the PoE power cable to the RPS800-A: Plug the H2*7 of the PoE power cable into the DC outputof the RPS800-A, and then fasten the screw, as shown in callout 5 on Figure 34.Step5 Supply power to the RPS800-A: Plug the female end of the AC power cable into the AC input on theRPS800-A and ensure a good contact, and plug the male end of the AC power cable into the externalpower supply socket.Figure 34 Connect the RPS800-A356471 21: NEG(–) terminal 2: RTN(+) terminal3: Grounding point 4: DC input5: Insert the H2*7 plug of the PoE power cable into the DC output 6: AC input7: RPS800-A
