Power Over Ethernet; Poe System Configuration - Planet WGS-5225-8P2SV User Manual

4.7 Power over Ethernet

4.7.1 PoE System Configuration

Under some conditions, the total output power required by PDs can exceed the maximum available power provided by the
PSU. The system may come with a PSU capable of supplying less power than the total potential power consumption of all the
PoE ports in the system. In order to maintain the activity of the majority of ports, PoE power management is implemented.
The PSU input power consumption is monitored by measuring voltage and current .The input power consumption is equal to
the system's aggregated power consumption .The PoE power management concept allows all ports to be active and activates
additional ports, as long as the aggregated power of the system is lower than the power level at which additional PDs cannot
be connected .When this value is exceeded, ports will be deactivated, according to user-defined priorities. The power budget is
managed according to the following user-definable parameters: maximum available power, ports priority, maximum
allowable power per port.
Reserved Power determined by
There are two modes for configuring how the ports/PDs may reserve power and when to shut down ports.
 Consumption mode
In this mode each port automatically determines how much power to reserve according to the class the connected PD
belongs to, and reserves the power accordingly. Four different port classes exist and one for 4, 7, 15.4 and 30.8 watts.
 Allocation mode
In this mode the user allocates the amount of power that each port may reserve. The allocated/reserved power for each
port/PD is specified in the Maximum Power fields. The ports are shut down when total reserved powered exceeds the
amount of power that the power supply can deliver.
In Allocation mode the port power will not be turned on if the PD requests more available power.
This section allows the user to inspect and configure the current PoE configuration settings, as below appears.
Figure 4-7-1: PoE Configuration Screenshot
402
User's Manual of WGS-5225-8P2S Series