From PHOENIX CONTACT USA
The use of Power over Ethernet (PoE) will increase because of its ease of implementation and low cost of installation. These devices are frequently installed in open-air, unshielded environments, which increases their susceptibility to electromagnetic interference (EMI). Applications using PoE and PoE+ in open-air environments are subjected to large surge currents, and protection must be installed to prevent damage. This paper will outline the components, standards and grounding used in PoE protection.
The two main standards for PoE are IEEE 802.3af and 802.3at. These standards relate to the data speeds, voltage, current, and power that can be supplied to the end device. The surge device must be able to meet these standards, like any other network device, and protect against damage.
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