Agilent Technologies, Inc.

Ron D Cook

James W Kirk

Fanny I Mlinarsky

Michael J Haley

A probe for a cable tester having a first interface for connection to the cable tester; a second interface, connected to the first interface, for connection to a cable to be tested; and a memory, associated with the probe and accessible by the cable tester, storing configuration data associated with the probe.

Cable tester error compensation method and apparatus

A test unit for measuring crosstalk in twisted pair cable. The test unit has an output signal balance (OSB) circuit that compensates for parasitic capacitance at its output terminals. The OSB circuit has a voltage controlled capacitance connected in circuit with each output terminal to control the effective capacitance between the output terminals and ground. The bias voltage for the variable capacitances is calibrated by a method in which the voltage for one of the variable capacitors is held constant while the voltage for the other capacitor is varied in voltage levels. A test signal frequency sweep is applied to the test unit output terminals. First and second voltage values are obtained and a final bias voltage value is calculated from using these two values.

Crosstalk test unit and method of calibration

A test system method for measurement of crosstalk in a multi-pair cable of the type used in local area networks. The system uses a far end signal generator at one end of the cable and a near end signal generator at the near end of the cable. For a far end crosstalk measurement, the far end test unit transmits a high frequency far end test signal and a lower frequency reference signal on one of the wire pairs of the cable. The near end test unit responds to the received reference signal to generate a near end test signal in phase coherency with the far end test signal. A far and crosstalk measurement analysis is then conducted using the received far end test signal, the near end test signal and a crosstalk signal induced by the far end test signal in one of the other wire pairs of the cable.

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Littleton, MA, United States of America

Ron D Cook