Communication system trunk circuit

Details Communication system trunk circuit Communication system trunk circuit

1976-11-03

1977-09-20

Robinson, Thomas A.

H04Q 318

Patent

active

040499197

ABSTRACT:
A trunk circuit for interconnecting an electronic and a step-by-step electromechanical switching exchange including a sensing circuit that is transparent to the transmission and supervisory signals. The sensing circuit consists of a pair of voltage dividers composed of at least four resistors each with the midpoint of each voltage divider connected to a voltage differential detecting means. The midpoints of the voltage dividers have substantially equal voltage levels in one state of the transmission path and have a measurable voltage differential in another state of the transmission path. Under conditions where a subscriber flash signal is not to be propagated through, the voltage dividers are arranged to have their resistance decreased, simulating an off-hook condition.

REFERENCES:
patent: 3808377 (1974-04-01), Young
patent: 4007335 (1977-02-01), Hetherington et al.

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