Tone applying line circuit

Details Tone applying line circuit Tone applying line circuit

1978-08-14

1980-05-20

Brown, Thomas W.

H04Q 144

Patent

active

042040949

ABSTRACT:
A circuit for efficiently applying tones or other signals to a line circuit which has a variety of conditions such as being split from the central office, and having a telephone set connected thereto either on hook or off hook. The invention is comprised of a tip lead and a ring lead having one end for connection to a central office and another end for connection to a subscriber's telephone set. A low impedance signal source including line current conducting means is connected in series with the tip or ring lead. A switchable resistance is provided for connecting a circuit path between the tip and ring leads at the telephone set end of the tip and ring lead. Preferably the low impedance signal source including the line current conducting means has a resistance which is 25% or less than the off hook impedance of the telephone set.

REFERENCES:
patent: 2966556 (1960-12-01), Hofmann
patent: 3250858 (1966-05-01), McDermott et al.
patent: 3385935 (1968-05-01), Anderson et al.
patent: 3862374 (1975-01-01), Evers
patent: 4011413 (1977-03-01), Phillips

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