Telephone line feed circuit

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Details

179 16F, 179 81R, H04M 100, H04B 316

Patent

active

043451179

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.

REFERENCES:
patent: 3870896 (1975-03-01), Kiko
patent: 4037066 (1977-07-01), Kiko
patent: 4268723 (1981-05-01), Taylor

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