System for interconnecting subscribers lines to an automatic dig

Details System for interconnecting subscribers lines to an automatic dig System for interconnecting subscribers lines to an automatic dig

1979-12-04

1982-12-28

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 67, H04Q 1100

Patent

active

043665667

ABSTRACT:
In the interconnection system between telephone subscribers lines and digital telephone electronic switching equipment, individual subscriber equipment is associated with each line, which is comprised of means for providing conventional line interface functions and also a conventional two-four wire differential coupler. The four wire output of the coupler is liked to an A/D and D/A converter whose digital output is connected to an output multiplex and digital input to an input multiplex. Each individual equipment has an outgoing and return route allotted in both the input and output multiplexes. The input and output multiplexes or time shared data busses are multiplied to the inputs and outputs of a plurality of basic digital switches connected by two-way digital multiplexes or data busses.

REFERENCES:
patent: Re28097 (1974-08-01), Nordquist et al.
patent: 3760103 (1973-09-01), Condon
patent: 3914559 (1975-10-01), Knollman
patent: 4021619 (1977-05-01), Potter et al.

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