4G PoE IIoT Gateway
2.2.4 Power over Ethernet
Power over Ethernet (PoE) describes any of several standardized or ad-hoc systems which pass
twisted pair Ethernet cabling. This allows a single cable to provide both data
connection and electric power to devices such as wireless access points, IP cameras, and VoIP phones.
This PoE cellular gateway integrated four-port PoE switch function, and plays as Power Sourcing Equipment
(PSE) role that provides power on the Ethernet cable. The PoE design is compliant to IEEE802.3af/at standard,
The PSE can auto-detect the type of connected PD (Powered Device) and provide adequate power to it. The
maximum allowed continuous output power per cable is 15.4W for IEEE 802.3af PD device, and 30W for
IEEE802.3at PD device.
However, to make the PoE cellular gateway provide required power through the Ethernet cables, you have to
prepare required PoE power supply and connect it to the PoE cellular gateway properly, as stated in
Section 1.6
Hardware Installation / Connecting Power
. The PSE power sourcing capability is up to 120W. If you intend to
connect four 802.3at PD devices to the PoE cellular gateway, you have to make sure your PoE power supply can
provide enough power, more than 120W (e.g., power supply with rated capability 180W) to the gateway.
In addition to provide required power to connected PDs, this PoE cellular gateway also provides simple
management function to control the power budgets and connected PDs. The PoE port management function
includes PoE port control, PD failure check and Power Off/On by schedule.
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