Control circuit for telephone exchange system - applies continuous pulses to control element and to selector stage and disconnects them when required

摘要

Equal centrally generated continuous pulses are applied to a control element (e.g. a first group selector) and to the selectro stage to be controlled. A comparator activates switches when a stored dialling criterion is equal to the number of dialling pulses allocated to it which are picked up from the continuous pulse generator. The control element has switches for continuous pulse connection and for delivery of a time position signal to the controlled selector stage, which activates switches applying the continuous pulses to the pulse evaluator. When a corresponding number of dialling pulses arrives at the comparator, it activates switches which switch off the continuous pulses and deliver a time position signal to the selector stage.