Telephone set with on-hook line seizure

Details Telephone set with on-hook line seizure Telephone set with on-hook line seizure

1990-07-13

1992-10-13

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379380, 379413, H04M 100

Patent

active

051557649

ABSTRACT:
A telephone set is provided enabling seizure for originating and terminating calls of a telephone line connected thereto to be performed as well as release thereof, as the result both of a first command produced by a first switching entity actuated from the handset of the telephone set as well as via a second command produced by a second switching entity that is able to be actuated independently of the handset, switching entities producing the commands via individual communication establishment elements which are inserted in parallel in a loop which links, via the controlled power feeding arrangement, the output terminals of a first diode bridge, the input terminals of which are connected to the two line wires via a protection circuit, together with a second diode rectifying bridge, performing actual rectification, linked via capacitors to the output of the protection device, in parallel with the first diode bridge, and adapted to power a microprocessor and relevant circuits of telephone set circuitry, via a second controlled power feeding arrangement, from the alternating current signals transmitted by the line during ringing phases.

REFERENCES:
patent: 4506112 (1985-03-01), Bitsch
patent: 4562309 (1985-12-01), Le Creff et al.
patent: 4614843 (1986-09-01), Coulmance
patent: 4636587 (1987-01-01), Zoerner
patent: 4809322 (1989-02-01), Riesmeyer
patent: 4860346 (1989-08-01), Mellon
TN Nachrichten, No. 91, 1987, pp. 3-14; Kramer et al.: "TN-Terminals im neuen Design".
Toute L'Electronique, No. 522, Mar. 1987, pp. 83-86; "Une interface ligne telephonique/modem".

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