| 摘要 |
A method of determining an effective resistance between a power sourcing equipment and a powered device, the powered device exhibiting an interface and an operational circuitry, the method comprising: prior to connecting power to the operational circuitry of the powered device, impressing two disparate current flow levels (I<SUB>1</SUB>, I<SUB>2</SUB>) between the power sourcing equipment and the powered device; measuring the voltage at the powered device interface (V<SUB>PD1</SUB>, V<SUB>PD2</SUB>) responsive to each of the impressed disparate current levels; measuring the voltage at the power sourcing equipment (V<SUB>PSE1</SUB>, V<SUB>PSE2</SUB>) responsive to each of the impressed disparate current levels; and determining the effective resistance between the power sourcing equipment and the powered device responsive to the V<SUB>PD1</SUB>, V<SUB>PD2</SUB>, V<SUB>PSE1</SUB>, V<SUB>PSE2</SUB>, I<SUB>1 </SUB>and 1<SUB>2</SUB>.
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