Patent ID: 7421290
Filing Date: 2008-09-02
Classification: G05F,G06F,H02G,H04L,H04M

Abstract:
1. A power supply subsystem configured to provide electrical power to at least node over communication cabling, the power supply subsystem comprising: a management and control unit; a combiner combining power into the communication cabling substantially without interfering with data communication between a local area network (LAN) switch and the at least one node over the communication cabling; and a current limiting circuitry controlling current of said power combined into said communication cabling via said combiner, said current limiting circuitry comprising a comparator and arranged to: wherein said management and control unit is operative to interrogate the at least one node to which it is intended to transmit power over the communication cabling in order to determine whether the node's characteristics allow it to receive power over the communication cabling.