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Chapter 8: RJ-45 Pin Assignment
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.
GE-DS-242-PoE Managed Ethernet Switch User Manual
207
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