Patent ID: 6151364
Filing Date: 2000-11-21
Classification: H04B,H04L

Abstract:
A codec supporting quantization level sampling (QLS) communications with a PCM modem over a digital loop carrier (DLC) having an analog connection to a central office (CO) line interface, said CO line interface having a digital-to-analog converter (DAC), a clock controlling the DAC, and a reconstruction filter, said codec comprising:an analog-to-digital converter (ADC) synchronized to the CO clock for converting analog signals from the CO line interface into corresponding digital signals;an equalizer receiving said digital signals from said ADC and providing a transfer function to substantially compensate for distortions introduced by said CO line interface reconstruction filter and the signal path from said CO line interface reconstruction filter to said ADC; anda slicer sampling the output of said equalizer to output digital data over said DLC that reproduces the digital data entering the CO line interface.