Method and apparatus to measure far end crosstalk for the determination of equal level far end crosstalk
AssigneeFluke Corporation
InventorsHenriecus Koeman, Jeffrey S. Bottman
Life of this patent
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Abstract
A system for determining FEXT and ELFEXT of generic cabling systems provides accurate measurements of these parameters by determining and removing the effect of the connectors at the respective ends of the link, thereby giving measurement values that correspond to the defined link, rather than including the crosstalk contributions of the connectors, which can be substantial.
Claims23
A method of measuring far end crosstalk characteristics of a link comprising the steps of:
- measuring far end crosstalk of a local connector on the link;
- measuring far end crosstalk of a remote connector on the link;
- measuring phase and amplitude of far end crosstalk at a remote end of the link;
- measuring attenuation in a disturbed path;
- measuring propagation delay of the disturbed path;
- measuring attenuation in a disturbing signal path;
- measuring propagation delay of a disturbing signal path;
- and
- determining the equal level far end crosstalk based on the measured values.
A method of measuring far end crosstalk characteristics of a link with measurement results from a total system comprising the steps of:
- measuring far end crosstalk of a local connector on the link;
- measuring far end crosstalk of a remote connector on the link;
- measuring crosstalk characteristics of the total system;
- and
- measuring the attenuation of signals on portions of the system
- subtracting the measured far end crosstalk of the local connector times a measured attenuation and subtracting the crosstalk of the remote connector times a measured attenuation from the measured crosstalk of the total system to provide the crosstalk characteristics of the link.
An apparatus for measuring far end crosstalk characteristics of a link comprising:
- storage memory to store measured far end crosstalk characteristics of a local connector and of a remote connector;
- phase and amplitude measurement apparatus to determine far end crosstalk at a remote end of the link;
- attenuation measurement apparatus to measure attenuation in a disturbed pair;
- propagation delay measurement apparatus to measure propagation delay of the disturbed pair and propagation delay of a disturbing pair;
- and
- determining apparatus for factoring out the crosstalk effects of the local and remote connectors to provide far end crosstalk and equal level far end crosstalk measurements of the link.
Dependencies are inferred from the claim text.