H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/66
H04M 7/00 (2006.01) H04M 1/58 (2006.01) H04M 1/76 (2006.01) H04M 19/08 (2006.01)
Patent
CA 2035099
In a method and configuration for forming a line termination at two line terminals of a telephone line, alternating signals are separated from direct signals applied to line terminals, referred to a reference variable and added to a transmission signal from a transmission terminal to form a resultant actual-value signal. The resultant actual-value signal is compared with a reference signal at a gain-controlled amplifier. The reference signal is formed with an impedance transmission function corresponding to a given termination impedance by weighting the alternating signal at one of the line terminals being connected to a current sensor resistor. A current between the line terminals is determined with a control transistor associated with the current sensor resistor. The control transistor is controlled with the gain-controlled amplifier.
Dielacher Franz
Formanek Karl
Wallnberger Gerald
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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