Importance

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Abstract

An apparatus and method for interfacing a communication device, such as a Customer Premise Equipment (CPE) to different telephone networks. The telephone networks typically provide a voltage of 48 volts to the CPE. However, this DC voltage tends to fluctuate. Furthermore,the impedances of the telephone network varies. The apparatus provides a constant current to the communication device while coupled to different telephone networks. Since most communication devices use amplitude modulations for transmitting data, a constant DC biasing current is desired. The apparatus can sense load impedances of the telephone networks, and dynamically adjust the current source so that DC biasing currents remain relatively constant. The apparatus is coupled to the telephone network so that communication between the communication device and the telephone network is optimized.

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First Claim