Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1992-10-22
1995-08-08
Chin, Stephen
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379 30, H04M 124
Patent
active
054406129
ABSTRACT:
A method of measuring under running conditions operation parameters of an interface circuit and a telephone subscriber line connected to it, said interface circuit comprising a first integrated circuit operating on a high voltage with outputs connected to the line and second outputs on which transverse and longitudinal current values of the line are respectively present in normal operation, and a second integrated circuit operating on a low voltage between the first circuit and a telephone exchange, comprises the steps of: switching the outputs across an impedance of a predetermined value, and measuring through the first circuit the values of the currents present on the second outputs; switching said outputs back to across the line leads, and measuring through the first circuit the values of the transverse and longitudinal line current values; performing, for each measurement through the second circuit, a digital encoding of the measured values and transmitting such encoded values to the telephone exchange.
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Subscriber Line Interface Kit for L3000N and L3030 (Manual), SGS-Thomson Microelectronics, Sep. 1993.
Roche et al., "Electronic Borscht Circuits and the Local Network," NTG-Fachberichte ISSLS 80, (1980) vol. 73.
Lari Ferdinando
Siligoni, deceased Marco
Chin Stephen
Kim Kevin
SGS--Thomson Microelectronics S.r.l.
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