G - Physics – 01 – R
Patent
G - Physics
01
R
324/43
G01R 27/00 (2006.01) G01R 27/16 (2006.01) H04B 1/58 (2006.01) H04M 3/30 (2006.01)
Patent
CA 1196380
19 A B S T R A C T IMPEDANCE MEASUREMENT IN 4-WIRE TO 2-WIRE CONVERTERS A method of determining impedance parameters of a 4-wire to 2-wire converter comprises connecting a first known reference impedance across the 2-wire terminals of the converter, feeding an oscillating input signal into the input terminals of the 4-wire side of the converter, and monitoring the input signal fed into the converter and the signals output across the 2-wire terminals and the output terminals of the 4-wire side of the converter. A second known reference impedance is then connected across the 2-wire terminals, an oscillating input signal is fed into the input terminals of the 4-wire side of the converter, and the input signal fed into the converter and the output signals across the 2-wire terminals and the output terminals of the 4-wire side of the converter are monitored. Then, the impedance parameters of the 4-wire to 2-wire converter are calculated from the monitored signals. An apparatus for performing this method comprises means (2) to generate an oscillating signal and apply it to the input terminals of the 4-wire side of the converter, a first (ZL1) and second (ZL2) known reference impedance, comparator means (2) to compare two oscillating signals and produce outputs representative of the ratio in the magnitude of the two signals, means (5, BA3, BA5) to feed the signal applied to the input terminals of the 4-wire side of the converter also to the comparator means (2), switch means (S1, S2) to connect the first (ZL1) or the second (ZL2) known reference impedance across the 2-wire terminals of the converter and also to connect the 2-wire terminals or the output terminals of the 4-wire side of the converter to the comparator means (2), and a programmed computer (3) programmed to calculate the impedance parameters of the converter from the outputs of the comparator means and the values of the first (ZL1) and second (ZL2) reference impedances.
435499
British Telecommunications Public Limited Company
Ridout & Maybee Llp
LandOfFree
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