3com 4210 PWR 18-PORT User Manual

Figure 23 shows how to connect the power supply to the RPS socket in the back 
of the switch. Use the cable tie supplied with your switch to support the cable in 
the back of the RPS connector as shown in Figure 23.

Figure 23   RPS Connection to the Switch

When the RPS is connected to the switch, you can move the circuit breaker in the 
RPS to the closed (on) position and the switch will be powered by the -48V DC 
power.

The -48V DC power takes priority over the AC mains and powers the switch if it is 
connected.

Use the earthing cable that accompanies your switch if the length is suitable. 
Alternatively use the earthing cable specification as defined in “Earthing Lead” on 
page 20.

The recommended cable length should not exceed three meters (9.84 feet).

The Switch 4210 Power over Ethernet (PoE) units can supply power to any IEEE 
802.3af compliant device through any of its front panel ports over a Category 5 or 
Category 5e Ethernet cable. The same cable connects the device to the network.

The Switch 4210 units can supply power through the 10/100 ports only.

Power over Ethernet is a self-configuring protocol. When you plug a PoE 
compliant device into one of the ports on the switch, the switch supplies the 

+ -

NULL

-48 -60V

;2.0A

100-240V

;50/60Hz

;1.0A

~

Null

+

-

Pinout

Cable Tie