Using Power Over Ethernet - 3Com 4210 Getting Started

Connecting the Earthing
Cable
Using Power over
Ethernet
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
NULL
-48 -60V;2 0A
Pinout
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 earthing cable is only required if the switch is powered by the RPS only.
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
Connecting a Redundant Power Supply
+ - N U LL
0 V ;2 .0 A
-4 8 -6
z; 1 .0 A
0 /6 0 H
4 0 V ;5
~
1 0 0 -2
Null
-
+
Cable Tie
31