Patent ID: 8594314
Filing Date: 2013-11-26
Classification: H02J,H04B,H04M

Abstract:
1. A method of providing direct current through a two-conductor cable connecting a remote power source to a local communications device having one or more additional capabilities, features and devices that require power in excess of that delivered by a traditional telephone network line, the method comprising: passing a direct current power signal from the remote power source through a low pass filter comprising a split inductor to produce a filtered direct current power signal, the low pass filter being remote from the local communications device, having a low equivalent series resistance, and having a significant reactance at voice and signaling frequencies thereby mitigating non-DC signal attenuation when the filtered direct current power signal is combined with higher frequency alternating current signals that assist in the operation and control of the local communications device having one or more additional capabilities, features and devices; utilizing one or more protection systems to mitigate damage to the power source in the event of a short or other fault condition, the one or more protection systems comprising one or both of: (i) passing the filtered direct current power signal through one or more resettable fuses having a low equivalent series resistance, and (ii) passing the direct current power signal through a current foldback circuit; and transmitting the filtered direct current power signal through the two-conductor cable to the local communications device having one or more additional capabilities, features and devices.