Electronic cross-point matrix telephone private switching equipm

Details Electronic cross-point matrix telephone private switching equipm Electronic cross-point matrix telephone private switching equipm

1976-04-21

1978-05-09

Brown, Thomas W.

179 18AD, 179 18ES, H04Q 350

Patent

active

040888401

ABSTRACT:
A telephone private switching equipment of the space-division operated type comprises a matrix of electronic switch cross-points each made of a single controllable two-state member connected across a conversation conductor of a row and a conversation conductor of a column of the matrix and having a trigger terminal connected through unidirectional members to both a cross-point activation conductor of this row and a cross-point activation conductor of this column, each row and each column comprising only these two conductors. Each column of the matrix is controlled from a cross-point selection control unit capable of applying trigger pulses to the cross-point activation conductor of the column and service voltages and currents to the conversation conductor of the column. Each subscriber's line circuit of the equipment includes a two-wire to one-wire converter the one-wire terminal of which is connected to the conversation conductor of a row and includes means capable of applying periodical pulses to the cross-point activation conductor of this row. Each external network line connecting circuit of the equipment is connected by a one-wire conversation lead to the conversation conductor of a row comprising only a single cross-point of the matrix.

REFERENCES:
patent: 3141067 (1964-07-01), Spandorfer
patent: 3433900 (1969-03-01), Schlichte
patent: 3694812 (1972-09-01), Enomoto
patent: 3786194 (1974-01-01), Pinede et al.
patent: 3881066 (1975-04-01), Macrander et al.
patent: 3943297 (1976-03-01), Pommerening et al.

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