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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Isolation Requirements in Magnetic Components
We will discuss isolation requirements in general in much greater detail in the next chapter. Here we will go through some concerns related to magnetics.
Because the data lines travel through the building, they are prone to picking up rather large, though transitory, voltage spikes, either capacitively or inductively. These spikes often come from motorized equipment operating nearby, because inductors are known to be able to create huge voltage spikes. Or the spikes can be the result of relatively rare but much more severe surge events, like lightning striking far away or atmospheric discharges in general. Besides product reliability, a key concern, in fact the most pressing concern, is that the ...

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