Patent ID: 7813752

Claim:
A power control subsystem for controlling the supply of a power transmitted to at least one node over a communication cabling, the power control subsystem comprising a circuitry to control current of the power transmitted over the communication cabling, said circuitry to control current comprising: a current sensor arranged to output a signal proportional to the current of the power transmitted over the communication cabling; a current limiter and switch; a timer, a first comparator in communication with said current sensor and arranged to compare the output signal of said current sensor with a first threshold value and output a signal responsive to said comparison, said output signal of said first comparator supplied to said current limiter and switch so as to provide current limiting for the power transmitted over the communication cabling responsive to the first threshold; and a second comparator in communication with said current sensor and arranged to compare the output signal of said current sensor with a second threshold value, said second threshold lower than said first threshold, said second comparator further arranged to output a signal responsive to said comparison, said output signal of said second comparator supplied to said current limiter and switch via said timer so as to provide delayed over current cut-off of said power at the second threshold.