Telephone line feed circuit
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United States of America Patent
Stats
-
Aug 17, 1982
Grant Date -
N/A
app pub date -
Nov 20, 1980
filing date -
Nov 29, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To limit the line current dissipation in a telephone system it is considered desirable, especially in electronic systems, for the line current feed to be constant current. In the present arrangement the constant current supplied to the line is made adjustable in accordance with line conditions, especially the voltage between the line wires. A high impedance monitor is connected across the line to monitor the voltage between the two wires and to produce therefrom a reference voltage which is applied to the constant current generator so as to cause it to generate a current for line feed whose value is determined by the line voltage.
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