High impedance loop-seizing and dial pulsing circuit

Details High impedance loop-seizing and dial pulsing circuit High impedance loop-seizing and dial pulsing circuit

1978-01-03

1979-04-24

Robinson, Thomas A.

179 18FA, H04M 302, H04L 2502

Patent

active

041513770

ABSTRACT:
An improved loop-seizing and dial pulsing circuit arrangement of the type employed in telephone trunks has an extremely low insertion loss. The circuit comprises a diode bridge connected across a telephone loop and a controlled constant current source connected across the bridge. A current limiting diode also referred to as a constant current diode is used to establish a bias current for the constant current source.

REFERENCES:
patent: 3588672 (1971-06-01), Wilson
patent: 3867567 (1975-02-01), Herron et al.
patent: 3953683 (1976-04-01), Gabrielson
patent: 4063045 (1977-12-01), Greischar

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