Patent ID: 9267984
Filing Date: 2016-02-23
CPC Classification: G01R,H04L

Claim Text:
1. A tester for a cable, the tester comprising: a transmit signal generator configured to transmit, in synchrony with a clock having a predetermined period, a first signal onto the cable; a receiver including (i) an analog to digital converter (ADC), and (ii) a filter having a plurality of tap coefficients; and a controller configured to determine a length of the cable or a length to a discontinuity in the cable, wherein the length of the cable or the length to the discontinuity in the cable is determined based at least in part on (i) a particular tap index at which a peak occurs among the plurality of tap coefficients of the filter, and (ii) the predetermined period of the clock, the controller further configured to transform the tap coefficients to a frequency domain by a Fourier transform unit, determine a phase response based on the transformed tap coefficients, and determine a round-trip delay from a differentiation of the phase response with respect to a radian frequency.