Patent
1976-09-17
1978-03-28
Claffy, Kathleen H.
179 81R, H04M 1272
Patent
active
040816192
ABSTRACT:
A switching arrangement by which a telecommunication subscriber station selection unit is connected into the central office line is described. The selection unit involved is of the key-operated type wherein key actuation produces a specific surge current corresponding to the specific key depressed. Semiconductor elements form impulse contacts which are operated by a key-controlled pulse generator. A bistable relay is provided for disabling the station's speech circuit during the dialing phase, and at the same time maintains a transmission and feeder circuit, of which the selection unit forms a part and which is completed by actuation of a key. The operation of the bistable relay is influenced via a parallel circuit which offers a high impedance to the transmission and feeder circuit, so that the bistable relay can be rendered inoperative if it is erroneously in an operative state. Depression of a key is required to close the transmitter and feeder circuit, and when this occurs, i.e., during the dialing phase, the aforementioned parallel circuit no longer can affect the operation of the bistable relay.
REFERENCES:
patent: 3761640 (1973-09-01), Monin
patent: 3856982 (1974-12-01), Lawson et al.
patent: 3969592 (1976-07-01), Pipitone et al.
patent: 3973084 (1976-08-01), Houland
Claffy Kathleen H.
Myers Randall P.
Siemens Aktiengesellschaft
LandOfFree
Switching arrangement for telecommunication subscriber stations does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switching arrangement for telecommunication subscriber stations , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switching arrangement for telecommunication subscriber stations will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-643962