Apparatus and method for detection of off-hook phone in reverse power feeding architecture

摘要

A powering arrangement for use with reverse power feeding arranged to detect an improperly connected POTS phone going off-hook by: measuring a first current flow from a power sourcing equipment; identifying a rapid first increase in current flow from the measured first current flow, the rapid increase defined as a rate of change greater than a predetermined minimum rate of change; identifying a second increase in current flow from the measured first current flow, the identified second increase greater than a predetermined minimum amount; confirming that the identified second increase in current flow is maintained for at least a predetermined amount of time beginning with the identified first increase in current flow; and outputting an error signal to the power sourcing equipment in the event of the identified condition.

主权项

1. A powering arrangement for use with reverse power feeding, the powering arrangement comprising:
a control circuit; a power sourcing equipment, said power sourcing equipment responsive to said control circuit; and a current sensing circuit arranged to detect the amount of current provided by the power sourcing equipment, said control circuit in communication with said current sensing circuit, said control circuit arranged to:
measure a first current flow from the power sourcing equipment;identify a rapid first increase in current flow from the measured first current flow, the rapid increase defined as a rate of change greater than a predetermined minimum rate of change;identify a second increase in current flow from the measured first current flow, the identified second increase greater than a predetermined minimum amount;confirm that said identified second increase in current flow is maintained for at least a predetermined amount of time beginning with said identified first increase in current flow; andoutput an error signal to the power sourcing equipment responsive to said identified rapid increase in current flow, said identified second increase in current flow and said confirmation that said identified second increase in current flow is maintained for at least the predetermined amount of time.