Method for determining telephone dial pulse parameters independently of subscriber line length
AssigneeSiemens Aktiengesellschaft
InventorsGabriele Held-Elbert, Wolfgang Kaiser, Wilhelm Koch, Werner Schmutzler
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Abstract
A method is disclosed for measuring telephone dial pulse parameters independent of telephone subscriber line length. To avoid distortions resulting from varying subscriber line lengths, there is performed during the first pulse interval of a dial pulse series to be measured, a voltage measurement with results in a value that depends on the line length, and, in accordance with this value, the times measured for pulse interval and pulse duration of the dial pulse series are corrected.
Claims6
A method for determining telephone dial pulse parameters independently of the length of a subscriber line of a telecommunication system, the dial pulses being produced by loop interruptions caused by a dial pulsing switch of a subscriber terminal connected via the subscriber line, characterized in that, during a first pulse interval (WP1) of a dial pulse series, a voltage produced by a supply voltage source on the subscriber line (TL) is measured, and that according to the voltage amplitude thus measured, which depends on the line length of the subscriber line, times determined by measurement of the pulse duration (W1, W2 . . . ) and pulse interval (WP1 . . . ) of a dial pulse series are corrected.
Dependencies are inferred from the claim text.