Connector crosstalk and return loss cancellation
First Claim
1. A device for testing data communications cabling, comprising:
- a signal generator operable to generate a test signal to test the data communications cabling; and
a component operable to receive a reflected signal produced by reflection of the test signal from the data communications cabling including at least one reactive point source disturbance, the component further operable to determine characteristics of the reflected signal by analyzing a phase rotation of the reflected signal.
1 Assignment
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Accused Products
Abstract
A device for testing data communications cabling. The device consists of a signal generator that can generate a test signal to test the data communications cabling and a receiving component that can receive a reflected signal produced by reflection of the test signal from the data communications cabling including any reactive point source disturbance that may exist on the cabling. The receiving component can determine characteristics of the reflected signal by analyzing the phase rotation and amplitude of the reflected signal. The device can also include a cancellation generator that can generate a cancellation function based on the characteristics of the reflected signal. The cancellation function can substantially negate a portion of the reflected signal.
28 Citations
21 Claims
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1. A device for testing data communications cabling, comprising:
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a signal generator operable to generate a test signal to test the data communications cabling; and
a component operable to receive a reflected signal produced by reflection of the test signal from the data communications cabling including at least one reactive point source disturbance, the component further operable to determine characteristics of the reflected signal by analyzing a phase rotation of the reflected signal. - View Dependent Claims (2)
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3. A method for canceling the effects of a reactive point source disturbance, comprising:
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identifying an approximate location of the reactive point source disturbance;
sending a varying-frequency test signal to a cabling system that includes the reactive point source disturbance;
receiving a test signal response from the cabling system;
determining characteristics of the test signal response near the approximate location of the reactive point source disturbance;
determining a cable gain to and from the reactive point source disturbance;
generating a first correction function for the reactive point source disturbance based on the characteristics of the test signal response and one of a measured and an approximated cable gain; and
subtracting the first correction function from the test signal response to create a first corrected test signal response that substantially cancels the effects of the reactive point source disturbance. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device for testing a data communication cable, comprising:
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a signal source operable to send a test signal of varying frequency through the cable;
an analysis component operable to receive a test signal response produced by a reflection of the test signal from the cable, to determine a first set of reflection coefficients for the frequencies in the test signal response, to determine a first imaginary summation over selected frequencies for the first set of reflection coefficients including correction for cable gain, and to determine a first greatest peak in the first imaginary summation;
a correlation component operable to correlate a first greatest peak location to a reactive point source disturbance location, and to correlate a first greatest peak amplitude to a reactive point source disturbance reactance magnitude; and
a generation component operable to use the reactive point source disturbance location, the cable gain correction, and the reactive point source disturbance reactance magnitude to generate a reactive point source disturbance correction function, and further to combine the reactive point source disturbance correction function with the test signal response to create a first corrected test signal response. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification