Electrical disturbance protective device between a terminal and

Details Electrical disturbance protective device between a terminal and Electrical disturbance protective device between a terminal and

1985-02-27

1987-07-07

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

361111, 379379, 379412, H02H 322

Patent

active

046791159

ABSTRACT:
The protective device affords electrical insulation at all times between a terminal and a telephone line, without any modification to the terminal, and protects a subscriber against any voltage surge (resulting from lightning, for example), and transmitted in the line. The device includes optical guides bidirectionally transmitting in particular voice, multifrequency and data signals and providing insulation between two interfaces respectively connected to the terminal and the line. One interface is fed with a remote supply current and the other is fed from the main power supply. The protective device can further include moving insulating rods for driving switching devices for the terminal to seize the line and for reproducing an interrupted ringing signal transmitted from the line to the terminal.

REFERENCES:
patent: 3126452 (1964-03-01), Pettersson
patent: 3558830 (1971-01-01), Bender
patent: 3648110 (1972-03-01), Knight
patent: 4015115 (1977-03-01), Corcoran
patent: 4110570 (1978-08-01), Foster
patent: 4249266 (1981-02-01), Nakamori
patent: 4420841 (1983-12-01), Dudash
patent: 4558183 (1985-12-01), Corris et al.

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