Patent ID: 6973181
Filing Date: 2005-12-06
Classification: H04M

Abstract:
1. A method of applying a ring signal voltage from a subscriber line interface circuit to a ring signal load interconnected between first and second output terminals of the subscriber line interface circuit, comprising the steps of: providing a periodic input ring signal voltage, converting the periodic input ring signal voltage to two identical electrical currents, amplifying the two identical electrical currents to provide amplified identical electrical currents, inverting only one of the two identical electrical currents or only one of the amplified identical electrical currents, providing the amplified and inverted identical electrical currents to the first and second output terminals thereby forming the ring signal voltage applied to the ring signal load, comparing at least a first voltage related to the potential at at least one of the first and second output terminals to at least one first reference voltage, and controlling the amplitude of the generated ring signal voltage in response to the comparison.