Telegraphy – Systems – Printing
Patent
1980-02-11
1981-11-10
Robinson, Thomas A.
Telegraphy
Systems
Printing
178 69A, 179 16EA, H04M 322
Patent
active
043000240
ABSTRACT:
A measurement method and apparatus for determining the duration of a current signaling pulse in a telephone circuit, without breaking or interrupting the circuit, through observing a voltage waveform across the circuit, even though the voltage waveform is distorted by characteristics of the circuit and components attached to it. According to one embodiment, the derivative of the voltage pulse is electronically taken to identify the leading and trailing edges of the current pulse, a pedestal voltage added to it and then its transitions sensed. According to another embodiment, a high impedance technique is utilized which does not impair service along the communication circuit being measured, this technique sensing transitions of the voltage waveform and processing the signal to avoid the effects of any zero crossings that occur during the pulse as a result of high amplitude ringing or relay contact bounce.
REFERENCES:
patent: 3502983 (1970-03-01), Ingle et al.
patent: 3550021 (1970-12-01), Freeny
patent: 3710253 (1973-01-01), O'Neill
patent: 3935392 (1976-01-01), Smith et al.
Western Elec. Maintenance Manual; Model 4A Signaling Test Set; CD-IC244-01; Issue 2A-Section II-Undated, pp. 1, 21-22 and drawing.
Moyles Daniel C.
Wever Ruben
Robinson Thomas A.
Wiltron Company
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