Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Patent
1997-02-05
1997-12-16
Karlsen, Ernest F.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
324616, 324620, 324539, 364486, G01R 2728
Patent
active
056989857
ABSTRACT:
A pulse-based LAN cable test instrument that processes time-domain cross-talk measurement information in order to troubleshoot and quickly locate sources of cross-talk as a function of distance along the LAN cable system is provided. A pulse-response time record between a pair of transmission lines of the LAN cable system is first acquired. A series of steps to process the time-domain pulse response data in the time record are then performed to enhance the ability of the user to locate and troubleshoot the primary contributors to NEXT along any point of the LAN cable system. The pulse response data are first normalized as a function of distance from the LAN cable test instrument in order to compensate for losses along the LAN cable. Next, the pulse response data are integrated over the time record and the absolute value of the pulse response data is calculated to more clearly show the individual sources of cross-talk within the overall LAN cable pulse response. Finally, the pulse response data are scaled such that the areas of the LAN cable system causing a failing NEXT indication rise above a limit level on the graph to provide a fast visual determination of the sources of cross-talk for troubleshooting purposes.
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patent: 5570029 (1996-10-01), Bottman et al.
C.R. Harris, "Log. Frequency Plotter Speeds Recording of Crosstalk Measurement", Jul. 1973, pp. 112-113.
Sokolnikoff & Redhoffer, Mathematics of Physics and Modern Engineering, McGraw Hill, pp. 666-667, 1966.
C.R. Harris, "Log. Freqency-Plotter Speeds the Recording of Crosstalk Measurements", Off. Elec. Eng. J., vol. 66, pp. 2-3, 1973.
Sokolnikoff &Redheffer, "Mathematics of Physics and Modern Engineering", McGraw-Hill, pp. 666-667, 1966.
Press et al. "Numerical Recipes: The Art of Scientific Computing", Cambrige U. Press, pp. 121-126, 1986.
Barker Douglas J.
Fluke Corporation
Karlsen Ernest F.
Valone Thomas
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