Silicon Laboratories Si3482 SMART PSE-24 KIT, User Manual, Page: 5 / 22

S i 3 4 8 2 S m a r t P S E - 2 4 U G
Rev. 0.2 5
Since sufficient power is available, both ports are granted power. Because Port 2 was not enabled as PoE+, the
Class 4 PD is only granted 15.4 W.
Step 2 : Disconnect the PDs from Step 1, and connect the Class 4 PD to Port 1 and Class 3 PDs to each of Ports 2
and 3. Initially, use a 6.5 W load on each PD.
All three ports are granted power. Port 1 is now granted 30 W since Port 1 is enabled for high power (PoE+). Since
only one resistor is connected, approximately 6.5 W is drawn on each port.
Figure 5. Status Screen with Class 4 PD on Port 1 and Class 3 PDs on Ports 2 and 3
Step 3 : Increase the Load on the ports to create a port overload by switching in more load resistors.
For Port 2 or Port 3 (with Class 3 PDs), the port overload condition occurs with the three resistors, which
corresponds to about 19.5 W of input power. The following screen shot shows the result of an overload (indicated
by the status “blocked”) on Port 3.