Ring-trip detector

Details Ring-trip detector Ring-trip detector

1980-01-17

1981-04-14

Robinson, Thomas A.

179 17E, 179 18FA, 179 84R, H04M 302

Patent

active

042621720

ABSTRACT:
A ring-trip detection circuit is disclosed which is suitable for use at the remote terminal of a pair gain system, i.e., a system designed to supply more than one telephone subscriber with loop service over a single pair of metallic wires. The ring-trip detector circuit comprises a simple filter and semiconductor threshold circuit which responds to subscriber loop currents to disable ringing signals when the subscriber goes off-hook. The detector circuits are powered entirely by the ringing signal itself and thus draw no power when in the inactive state and require no auxiliary powering source in the active state.

REFERENCES:
patent: 3391253 (1968-07-01), Grandmaison
patent: 3689705 (1972-09-01), Pinede et al.
patent: 3917909 (1975-11-01), Macrander et al.
patent: 3941939 (1976-03-01), Holmes et al.

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