Bi-directional signalling arrangement for telecommunications sys

Details Bi-directional signalling arrangement for telecommunications sys Bi-directional signalling arrangement for telecommunications sys

1976-05-14

1978-03-28

Brown, Thomas W.

179 18ES, 179 18HB, H04M 302

Patent

active

040816133

ABSTRACT:
An arrangement for providing signalling to the lines of a telecommunications system employing non-metallic switching crosspoints such as a solid state switching network or time division switching network. In a system employing either type of network, line signalling such as ringing, coin control signalling, wire chief testing, and such other signals which are essentially high voltage signals cannot readily be transmitted through the switching network. The present system as disclosed provides an arrangement employing a common, multiplex highway between one or more signal sources and the line circuits. Operation of a switching element such as a relay in a line circuit selected by the common control completes a metallic path from the source bus to the selected line through closed contacts of the relay. In addition, signals of one or more different types may be multiplexed within a signal cycle to produce signals to a number of lines during the period when one line is being signalled. Within this framework, bi-directional signalling such as that required for testing lines can be readily implemented.

REFERENCES:
patent: 3443033 (1969-05-01), Louis
patent: 3641275 (1972-02-01), Perna et al.
patent: 3760120 (1973-09-01), Moorehead
patent: 3916118 (1975-10-01), O'Neill
patent: 3978293 (1976-08-01), Feiner

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