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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Immunity and Emissions
We have been mentioning “immunity” in previous sections without having spelled it out very clearly so far. We also referred to “a typical electromagnetic environment.” What do these terms mean and relate to?
Electromagnetic immunity/susceptibility (EMS) is one side of the total coin called electromagnetic compatibility (EMC). See the left side of Fig. 1.7. On the other side of the EMC coin lies electromagnetic emission (EME). For example, an intentional/unintentional electromagnetic emitter (Device A) sends out electromagnetic interference (EMI) all around it. Another device (Device B) in its immediate vicinity should not only continue to work well when faced with this impinging EMI (provided, of course, the levels of ...

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