Switch User Manual

19
4.4 PoE
 Power Management:
In a power over Ethernet system, operating power is applied from a power source (PSU-power supply unit) over the LAN
infrastructure to powered devices (PDs), which are connected to ports. Under some conditions, the total output power
required by PDs can exceed the maximum available power provided by the PSU. The system may a prior be planed 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 majority of ports active, power management is implemented.
The PSU input power consumption is monitored by measuring voltage and current .The input pow
er consumption is equal
to the system’s aggregated power consumption .The 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.
This section provides PoE (Power over Ethernet) Configuration and PoE output status of PoE Injector Hub, screen in Figure
4-7 appears.
Figure 4-7 PoE Configuration screen
Object Description
Power limit mode Allow to configure power limit mode of Web Smart Device. It can choose :
 Port Priority Deliver PoE power by port priority setting
 Total Limit. Set limit value of the total POE port provided power to the PDs.
For POE-1200, the total PoE power reservation from Port-1~12 is up to 110W
Fo
r POE-2400, the total PoE power reservation from Port-1~24 is up to 220W
Power reservation Show the total watts usage of PoE Injector Hub.