Line signalling over common highway for telecommunications syste

Details Line signalling over common highway for telecommunications syste Line signalling over common highway for telecommunications syste

1976-05-14

1978-02-21

Brown, Thomas W.

179 18ES, 179 18HB, H04M 302

Patent

active

040754308

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, and such other signals which are essentially alternating current or high voltage signals cannot readily be transmitted through the switching network. To switch a source of current such as ring current on a per-line basis to the line circuits normally requires considerable expenditure in additional switching hardware networks. The present system as disclosed provides an arrangement employing a 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.

REFERENCES:
patent: 3066193 (1962-11-01), Brightman
patent: 3223787 (1965-12-01), Jorgensen
patent: 3898391 (1975-08-01), Schwarzer et al.
patent: 3914559 (1975-10-01), Knollman
patent: 3916118 (1975-10-01), O'Neill
patent: 3935396 (1976-01-01), Barsellotti et al.
patent: 3973085 (1976-08-01), Shiff
patent: 3978293 (1976-08-01), Feiner
patent: 3996424 (1976-12-01), Agricola

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