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Chapter 8: Power Over Ethernet Overview
GE-DS-242-PoE Managed Ethernet Switch User Manual 199
AC Disconnect detection involves the induction of low AC signal in addition to the 48
VDC operating voltage. The returned AC signal amplitude is monitored by the PSE at
the port terminals. During normal operation, the PD's relatively low impedance lowers
the returned AC signal while a sudden disconnection of this PD will cause a surge to
the full AC signal level and will indicate PD disconnection.