DETECTING BRIDGED TAPS BY FREQUENCY DOMAIN REFLECTROMETRY-BASED

摘要

A frequency domain reflectometry-based bridged tap detection system for the telecommunication wireline employs a prescribed filtering operator (51), such as a 'best-fit' curve filter or a piecewise high pass filter bank, upstream of a Fourier processing operator (35), to improve the signal-to-noise ratio of the digitized amplitude array (34) of the swept frequency band. To fit the response tones within the dynamic range of the analog-to-digital converter (32) that digitizes the response tones detected from the wireline, a conditioning circuit (160), comprised of a comb filter bank (161), envelope detector (162) and compander (163), is installed between the test head (20) and the input to the analog-to-digital converter (32).