Data communication apparatus for use in a telephone system

Details Data communication apparatus for use in a telephone system Data communication apparatus for use in a telephone system

1973-01-15

1976-02-10

Claffy, Kathleen H.

Weighing scales

Weigher responsive material control

With external intercontrol

179 2A, 177 2AS, 179 5R, H04M 1100

Patent

active

039378896

ABSTRACT:
A data transmission system utilizing the telephone voice communication network for transmitting data between the location of a telephone subscriber's handset and a central station. A data transmitter is capacitively coupled to a bridge tap on the subscriber loop at the subscriber's handset and a data receiver is capacitively coupled to a bridge tap on the subscriber loop at the associated telephone company central office. The data transmissions occur at frequencies outside the standard telephone voice transmission frequency band of the system thereby providing continuous data transmission service without interfering with the normal voice communication function of the system.

REFERENCES:
patent: 2568342 (1951-09-01), Koehler
patent: 2911474 (1959-11-01), Weinberg
patent: 3111625 (1963-11-01), Crafts
patent: 3387091 (1968-06-01), Deiker
patent: 3404236 (1968-10-01), Halaby
patent: 3436487 (1969-04-01), Blane
patent: 3484553 (1969-12-01), Lovell
patent: 3492426 (1970-01-01), Foreman
patent: 3505474 (1970-04-01), Quatse
patent: 3575556 (1971-04-01), Wolf
patent: 3598917 (1971-08-01), De Raedt
patent: 3697693 (1972-10-01), Deschenes

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