Telephone transmission circuit with improved switching device

Details Telephone transmission circuit with improved switching device Telephone transmission circuit with improved switching device

1989-12-01

1992-06-09

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379359, 379387, H04M 100

Patent

active

051214253

ABSTRACT:
A circuit arrangement of simple structure for producing dialing pulses for a telephone transmission system so as to provide a relatively low insertion attenuation during transmission. The impedance of the transmission system should not be reduced. At loop closure the a.c. impedance of the circuit is high-ohmic and for d.c. current the circuit has a very low resistance. A switching apparatus is connected to the wires of a connecting line in parallel with the transmission system. The switching apparatus is arranged as a series connection of a bipolar transistor and a switching element consisting of a MOS field-effect transistor.

REFERENCES:
patent: 4232200 (1980-11-01), Hestad et al.
patent: 4306119 (1981-12-01), Kutzavitch
patent: 4360744 (1982-11-01), Taylor
patent: 4653088 (1987-03-01), Budd et al.
patent: 4717849 (1988-01-01), Shigekane
patent: 4739199 (1988-04-01), Shigekane
patent: 4800585 (1989-01-01), Dorland
patent: 4805214 (1989-02-01), Fensch et al.
patent: 4887295 (1989-12-01), Jenkins

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