Patent ID: 7167557
Filing Date: 2007-01-23
Classification: H04M

Abstract:
1. A subscriber line interface circuit (SLIC) comprising: a tip amplifier having a tip amplifier output that couples a tip amplifier output current to a tip portion of a subscriber loop; a ring amplifier having a ring amplifier output that couples a ring amplifier output current to a ring portion of said subscriber loop; a tip amplifier transient output current limit circuit, which is operative to monitor said tip amplifier output current individually for both tip source and tip sink currents, and to controllably limit said tip amplifier output current for both said tip source and tip sink currents, exclusive and irrespective of said ring amplifier output current, in accordance with at least one programmable tip amplifier output current limit therefor; and a ring amplifier transient output current limit circuit, which is operative to monitor said ring amplifier output current individually for both ring source and ring sink currents, and to controllably limit said ring amplifier output current for both said ring source and ring sink currents, exclusive and irrespective of said tip amplifier output current, in accordance with at least one programmable ring amplifier output current limit therefor.