Current mode ring trip detector

Details Current mode ring trip detector Current mode ring trip detector

1995-01-30

1997-09-23

Matar, Ahmad F.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379377, 379405, H04M 302

Patent

active

056712723

ABSTRACT:
A circuit and method for sensing in current mode when a telephone has been answered in a telephone system in which an answer is indicated when a dc component of a signal across a resistor exceeds a predetermined reference current. Currents sensed at the terminals of the resistor are combined to provide a third current that includes the dc component, without attenuation of the dc component. A filter separates the dc component from the third current so that the dc component can be compared to the reference current.

REFERENCES:
patent: 4995111 (1991-02-01), Tojo et al.
patent: 5117452 (1992-05-01), Callele et al.
patent: 5335271 (1994-08-01), Takato et al.
patent: 5347575 (1994-09-01), Naseer et al.
patent: 5402482 (1995-03-01), Minohara et al.
patent: 5422939 (1995-06-01), Kramer et al.

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