Patent ID: 6816575
Filing Date: 2004-11-09
Classification: H04B,H04M

Abstract:
A method of deriving a measure of signal transport loss of a wireline telecommunication link comprising the steps of:(a) coupling a varying frequency waveform of a prescribed bandwidth to a first location of said wireline telecommunication link; (b) at said first location of said wireline telecommunication link, measuring variations in signal level response in association respective frequencies of said varying frequency waveform; and (c) generating a measure of said signal transport loss over said prescribed bandwidth based upon said variations in signal level response measured in step (b), wherein step (c) comprises: c1â€”normalizing said variations in signal level response in accordance with reference data representative of simulated characteristics of said line; c2â€”modifying said normalized variations in signal level response to correct for constructive and destructive interference associated with reflections from discontinuities along said wireline, and thereby produce a distortion-corrected normalized signal response; c3â€”differentially combining said distortion-corrected normalized signal response with power spectral density values associated with the type of transceiver employed at a remote end of said wireline, to produce a modified differential data set; c4â€”summing said modified differential data set with a signal-to-noise gap constant required for reliable operation and coding gain values associated with the coding gain of said transceiver, to produce a coding gain-modified data set; c5â€”measuring background noise of said wireline telecommunication link; c6â€”differentially combining said coding gain-modified data set with said background noise measured in step c5, to obtain a set of noise margin data values associated with said respective frequencies of said varying frequency waveform; and c7â€”processing said set of noise margin data values obtained in step c6 to produce a set of frequency bins having bit contents which effectively represent a composite bit rate available for digital signal transport over said wireline telecommunication link.