Telephone system in which communication between stations is cont

Details Telephone system in which communication between stations is cont Telephone system in which communication between stations is cont

1979-01-08

1981-04-14

Brown, Thomas W.

Multiplex communications

Wide area network

Packet switching

370 30, 370 69, H04J 106, H04M 902

Patent

active

042621712

ABSTRACT:
A telephone system is provided which requires no central office. All the stations on the system are interconnected by a single line or cable and each station includes a computer which carries out the necessary switching. Each station is then able to call any other station, or to respond to a call, without requiring any central office. Frequency division multiplexing is used to permit a number of conversations to be carried on simultaneously and two frequencies are assigned to each conversation to permit duplex operation. A page capability is also provided.

REFERENCES:
patent: 3345466 (1967-10-01), Rahmig
patent: 3428899 (1969-02-01), Sekimoto
patent: 3535636 (1970-10-01), Muilwijk
patent: 3809815 (1974-05-01), Reed et al.
patent: 3864521 (1975-02-01), De Long et al.
patent: 3891804 (1975-06-01), Hachenburg
patent: 3894197 (1975-07-01), Cowpland et al.
patent: 4019176 (1977-04-01), Cour et al.
patent: 4020289 (1977-04-01), Anderson
patent: 4049914 (1977-09-01), Anderson et al.
patent: 4107471 (1978-08-01), Reed
patent: 4155040 (1979-05-01), Harmon et al.

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