Multiplex communications – Diagnostic testing – Path check
Reexamination Certificate
2008-06-10
2008-06-10
Abelson, Ronald (Department: 2619)
Multiplex communications
Diagnostic testing
Path check
C370S242000, C709S241000, C709S241000
Reexamination Certificate
active
07385932
ABSTRACT:
A technique for estimating distances and the nature of irregularities and faults on a telephone subscriber line is disclosed. Reflected test signals are measured as a function of frequency. The measurements are compensated for variable propagation velocity and variable line attenuation and then weighted before transformation with the Fourier transform. The amplitude and phase of peaks in the spectral domain identify the distances to the irregularities and the magnitude and phase angle of the reflection coefficients.
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Celaya Bernardo
Dodds David E.
Monteith Terence
Abelson Ronald
Battison Adrian D.
Dupuis Ryan W.
Telecommunications Research Laboratory
Williams Michael R.
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