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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Overview
High-energy transients (surges) can appear on data ports and can cause anything from system upsets to hard failure accompanied by charred boards.
Surges are known to have caused data transmission errors, memory scramble (mess-up), process interrupts, program lockups, latchup/failure in SCR/ICs, power-supply failures, hard-disk crashes, and general circuit-board failure. Add to that now, more specifically, burnt PHYs, PSEs, and PDs.
Interest in surge events has literally peaked in recent years, because manufacturers of switches/hubs, in particular, have noticed a very strong correlation between products that had been previously observed to have relatively lower, or somewhat compromised, surge-survival thresholds in internal product ...

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