Telephonic communications – Polystation line system – Call alerting
Patent
1984-12-31
1987-03-24
Dwyer, James L.
Telephonic communications
Polystation line system
Call alerting
379183, H04M 172
Patent
active
046530894
ABSTRACT:
A personal telephone adapter is disclosed which may be connected as an extension on a telephone line and which permits a caller to reach any of several extension telephones within a home or office without a human operator. A ring detector detects an incoming call and begins the operation of a timer, which, after a predetermined time, establishes a connection between the caller and a tone detector in the telephone adapter. Then, the caller may provide an extension signal selecting an extension and, in response, the tone detector in the adaptor at that extension will begin an output such as a tune to a user near the adapter. The user may then pick up the receiver of a telephone instrument and talk to the caller and, for a limited time after picking up the receiver, the user or caller may dial an additional extension signal to another adapter also connected as an extension to the telephone line. The caller may also select an adapter which is for controlling a remote control switch, and the caller may provide signals for switching the remote control switch on and off. In response, the adapter will provide a signal to the caller indicating that the switch is being switched on and off. The circuitry is designed so that a minimal amount of power is drawn prior to receiving a ring signal on the telephone line. When a ring is detected, power is then provided to the other circuitry.
REFERENCES:
patent: 4037059 (1977-07-01), Stine
patent: 4232195 (1980-11-01), Bartelink
patent: 4258230 (1981-03-01), Hellar et al.
patent: 4510349 (1985-04-01), Segre-Amar
Dwyer James L.
Eydelman Grigory
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