44
Connecting an external PoE power supply
To supply PoE power to S7502E or S7503E-S, a PoE power cable is required to connect the external PoE
power supply to the PoE input on the chassis rear panel. You can use an H3C RPS800-A or other DC
power supplies that can satisfy PoE input requirements: voltage range –46 V to –57 V (–52 V to –57 V
for 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 power
cables (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 cross
section of the cable is no less than 8.4 mm
2
(0.01 in
2
) and the power cable can carry 50 A current.
Connecting the RPS-800A to the switch
Follow 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 supply
socket, and fasten the captive screw. Connect the OT terminal (with a + sign) on the black wire to the
RTN(+) 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 output
of 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 the
RPS800-A and ensure a good contact, and plug the male end of the AC power cable into the external
power supply socket.
Figure 34 Connect the RPS800-A
3
5
6
4
7
1 2
1: NEG(–) terminal 2: RTN(+) terminal
3: Grounding point 4: DC input
5: Insert the H2*7 plug of the PoE power cable into the DC output 6: AC input
7: RPS800-A
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