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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Surviving the 10/700-μs Surge Test
As mentioned previously, the most recent EN 55024 standard now seems to ask for testing immunity of telecommunication lines using a CWG with an open-circuit voltage waveform that is 10/700 μs (the corresponding short-circuit current waveform is 5/320 μs). This is an alternative to the usual 1.2/50-μs open circuit voltage (8/20-μs short-circuit current) test. EN 55024 also states that the 10/700-μs test is “applicable only to ports which according to manufacturer’s specification may connect directly to outdoor cables” (see Table 2 of the EN 55024 standard). It also provides another loophole of sorts in the footnotes of Table 2, where it states that “where the coupling network for the 10/700-μs waveform affects ...

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