| 摘要 |
PURPOSE: An arrangement is provided for line voltage measurement and, thereby, line resistance calculation which does not require any extra components or any extra output terminal. CONSTITUTION: A control processor(2) is connected to a subscriber line interface circuit(1) to, on the one hand, control the operating mode of the line interface circuit(1) and, on the other hand, monitor, via a detector output terminal(D) of the line interface circuit(1), the status of a line connected to the line interface circuit(1). The control processor(2) is adapted to control the line interface circuit(1) to, on the one hand, ensure, at a first point of time, that its detector output terminal(D) is in a first signal state and, on the other hand, at that first point of time, initiate measurement of the line voltage. The line interface circuit(1) is adapted, at a second point of time, to bring the detector output terminal(D) to a second signal state after a time interval whose length in a predetermined manner is proportional to the measured line voltage, and the control processor(2) is adapted to convert the time interval during which the detector output terminal(D) of the line interface circuit(1) is in the first signal state, to a voltage value corresponding to the line voltage.
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