Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Patent
1996-05-23
1997-05-13
Regan, Maura K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
324 66, 324539, 379 6, G01R 2704
Patent
active
056296282
ABSTRACT:
An instrument and method for the troubleshooting and verification of copper-wire local area network (LAN) cable systems provides a series of resistance and capacitance measurements between all possible wire pairs using a pair of switch matrices and a software method for evaluating the measurements which are stored in a two-dimensional matrix. The stored measurements are evaluated against predetermined figures of merit and the decision pattern in matrix form is compared to that of a known good LAN cable system. Error messages responsive to mismatches are generated and presented to the operator via a user interface. Near-end cross talk (NEXT) isolation is evaluated using a mathematically calculated differential capacitance technique. Error messages are generated responsive to difference capacitance values larger than a figure of merit correlated to an acceptable level of NEXT isolation.
REFERENCES:
patent: 4634964 (1987-01-01), Chattler
patent: 5502392 (1996-03-01), Arjavalingam et al.
patent: 5532603 (1996-07-01), Bottman
patent: 5539321 (1996-07-01), Sciacero et al.
patent: 5559427 (1996-09-01), Hinds et al.
Hinds Mark E.
Lewandowski Robert J.
Locke Thomas P.
Sheffer Tzafrir
Barker Douglas J.
Fluke Corporation
Regan Maura K.
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