Patent Number: 6,297,647

Title: Crosstalk test unit and method of calibration

Abstract: 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.

Inventors: Kirk; James W (Westborough, MA), Cook; Ron (Littleton, MA), Haley; Michael J (Marlborough, MA), Mlinarsky; Fanny I (Bolton, MA)

Assignee: Agilent Technologies, Inc.

International Classification: H04B 3/46 (20060101); G01R 31/02 (20060101); G01R 027/28 ()

Expiration Date: 10/02/2018