Information transport system employing telephone lines

Multiplex communications – Wide area network – Packet switching

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Details

34087007, 379 93, 379107, H04J 102, H04M 1100

Patent

active

046655166

ABSTRACT:
A data transport system connects with a telephone system for communication of data via subscriber telephone lines to a provider of data services. Connection of multiplexing circuitry to a set of subscriber lines is accomplished at a main distribution frame by adapters or access blocks set between arc suppressors and a terminal block. The multiplexing circuitry is activated by signals of a line scan unit which, in turn, cooperates with a host computer associated with the provider of data services. This arrangement bypasses the central switching equipment. The data may be transmitted out of voice band, if desired, to enable simultaneous voice and data transmission. Passive, active and interactive data can be transmitted by the data transport system.

REFERENCES:
patent: 3922490 (1975-11-01), Pettis
patent: 3937889 (1976-02-01), Bell et al.
patent: 4171467 (1979-10-01), Evenchik
patent: 4225967 (1980-09-01), Miwa et al.
patent: 4399440 (1983-08-01), Douglas
patent: 4449218 (1984-05-01), Strehl
patent: 4504831 (1985-03-01), Jahr et al.

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