Chapter 4: Web configuration
NS3552-8P-2S-V2 User Manual 309
3~25 Watts
High Power PoE Splitter
High PoE splitters split the PoE 56 VDC over the Ethernet cable
into a 24/12V DC power output. It frees the device deployment
from restrictions due to power outlet locations, which eliminate
the costs for additional AC wiring and reduces the installation
time.
30 Watts
High Power Speed Dome
This state-of-the-art design is designed to fit into
environments like traffic centers, shopping malls, railway
stations, warehouses, airports, and production facilities for the
most demanding outdoor surveillance applications without the
need to install AC sockets.
System configuration
In a PoE 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 include a PSU
capable of supplying less power than the total potential power consumption of all the
PoE ports in the system. To keep the majority of the ports active, power management is
implemented.
The PSU input power consumption is monitored by measuring voltage and current, and
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
There are five modes for configuring how the ports/PDs may reserve power and when
to shut down ports.
Classification 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: 4, 7, 15.4, and 30.8 W.
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