A DSP line equalizer VLSI for TCM digital subscriber line transmission

In order to construct future ISDN, it is important to realize high-speed digital transmission systems using existing narrow-band subscriber lines. A line equalizer is a key component on the digital subscriber line transmission system. Previously some equalizers for 200kbps TCM digital subscriber line transmission using switched capacitor filter techniques were reported[1] [2]. Our approach is to realize the fully digital signal processing (DSP) with microprogram control multi-processors, which leads to high programability and accuracy. This paper describes a DSP line equalizer VLSI for 320kbps TCM subscriber line transmission.