发明名称 |
Method and device for measuring operation parameters of telephone subscriber lines and associated interface circuits |
摘要 |
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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申请公布号 |
US5440612(A) |
申请公布日期 |
1995.08.08 |
申请号 |
US19920964612 |
申请日期 |
1992.10.22 |
申请人 |
SGS-THOMSON MICROELECTRONICS S.R.L. |
发明人 |
SILIGONI, DECEASED, MARCO;LARI, FERDINANDO |
分类号 |
H04M3/00;H04M3/30;(IPC1-7):H04M1/24 |
主分类号 |
H04M3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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