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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Cable ESD (CDE)
Cable-sourced electrostatic discharge (CESD or cable ESD), also called a cable discharge event (CDE), becomes a possibility when an Ethernet cable becomes electrostatically charged. The cable could be charged primarily because of tribocharging (for example, by dragging it on a carpet or tiled floor), or even by induction (for example, from an already-charged person touching or holding it). This charged cable is suddenly discharged into a circuit when the cable is plugged into network equipment such as a switch, hub, repeater, and so on. This is most likely to occur in a new installation, or during an upgrade of an existing installation. “Good” cables are ironically the worst offenders as they ceate an excellent dielectric (good ...

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