Simultaneous voice and asynchronous data telephone

Details Simultaneous voice and asynchronous data telephone Simultaneous voice and asynchronous data telephone

1984-06-28

1986-06-03

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

179 2DP, H04J 312

Patent

active

045933898

ABSTRACT:
A telephone which can receive and transmit voice and asynchronous data simultaneously is provided. A signalling circuit provides signals indicating the request for a communication link or requesting a communication link to a predetermined location. A transceiver circuit synchronously receives and transmits frames of digital data bits representing data, voice and signalling information. A voice digitizer circuit converts the received frames of digital bits to an analog output and converts a received voice signal to a digital voice output. An interface circuit is used to interface between an asynchronous data source and the synchronous transceiver circuit. The telephone is line powered by utilizing D.C. isolating transformers to power both voice and data circuitry.

REFERENCES:
patent: 3459895 (1969-08-01), Ebhardt
patent: 4171467 (1979-10-01), Evenchik
patent: 4253131 (1981-02-01), Bosik et al.
patent: 4389544 (1983-06-01), Wagner et al.
patent: 4476559 (1984-10-01), Brolin et al.
"Telephone Nets Go Digital" by Dorros, IEEE Spectrum, Apr. 1983, pp. 48-53.

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