Instrument and method for testing local area network cables

Details Instrument and method for testing local area network cables Instrument and method for testing local area network cables

1994-04-04

1996-09-24

Regan, Maura K.

Electricity: measuring and testing

Conductor identification or location

324539, 324519, 324525, G01R 3102

Patent

active

055594271

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.

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