Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent
1987-11-17
1989-04-18
Ng, Jin F.
Telephonic communications
Subscriber line or transmission line interface
Protective circuit
361119, 361 56, 333177, H04M 100, H03H 709, H02H 900
Patent
active
048233838
ABSTRACT:
The protection device in accordance with the invention is connected in series with the line. It comprises either a circuit (1) for providing protection against voltage surges, or else a filter (2) for providing protection against radio frequencies, or else both said circuit and said filter. It protects terminal equipment (telephone set, data terminal, fascimile machine, etc.) against disturbances both in differential mode and in common mode. The device is mounted in a protection connector which may either be of the wall socket type or else of the removable adapter type for plugging into a conventional wall socket, and in either case the terminal equipment has a plug which plugs into a corresponding socket of the protection connector.
REFERENCES:
patent: 4191985 (1980-03-01), Phillips
patent: 4584622 (1986-04-01), Crosby et al.
patent: 4586104 (1986-04-01), Standler
patent: 4667173 (1987-05-01), Okochi
patent: 4761623 (1988-08-01), Schneider
"Power Line Filter," S. J. Sekhri, IBM Technical Disclosure Bulletin, vol. 17, No. 7, Dec. 1974, pp. 1998-1999.
Cardot Gerard
Dortu Giovanni
Ng Jin F.
Telic Alcatel
Vaas Randall S.
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