![]() The IEEE 802.3af standard also specifies various power levels for PoE devices, so-called power classes. Consequently, only 12.95 W is guaranteed to be available for the powered device. In PoE IEEE 802.3af, although Power Sourcing Equipment (PSE) provides a maximum output of 15.4 W per port, some of this power will be lost on a twisted pair cable. ![]() IEEE 802.3at provides a maximum of 25.5 W per port.IEEE 802.3af provides a maximum of 15.4 W per port.There are currently two standards for PoE: This feature can simplify network installation and maintenance, by using the switch as a central power source for other network devices. PoE allows Powered Devices (PDs), such as IP telephones, wireless access points, and network cameras to receive both power and data over the existing infrastructure, with no upgrade necessary. Power over Ethernet (PoE) is a method for supplying power to network devices over the same cabling used for data traffic.
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