ZA857475B - Apparatus for use in a telecommunications system - Google Patents

Abstract

1. Circuit arrangement for telecommunication installations, espectally for telephone exchanges in which centralized and/or partly centralized information-processing switching devices with a limited capability with regard to the information-processing capacity are provided, as well as measuring facilities (B) for determining the loadability of such switching devices, which integrate the constantly fluctuating load over periods of time which are in each case great enough to ensure a determination result with adequate result accuracy, and in which a counting facility (W), serving to establish the information-processing traffic load in each case of a switching device and to detect and avert information-processing traffic overloads, supplies with as little time delay as possible an instantaneous value of the information traffic load which is current and is produced by comparison in each case of a periodically repeatedly obtained counting result with the determination result received by it and stored in it, in order to avert without great delay such overloads in the event of an increase in the continuous counting results over the determination result by the rejection of information-processing orders, and in which, after aversion of an information-processing traffic overload and after a dropping of the periodically obtained counting results and an uninterrupted remaining of the same below the determination result during a certain minimum waiting time, during which increasingly higher values are established for the determination result deciding on loadability, due to the return of the load, the generation and/or relaying and/or evaluation of the determination result - the latter by continuous comparison of the periodically repeatedly obtained counting results with the determination result - is interrupted, and in which the determination result which is last established and stored in the counting facility (W) is replaced by a lower normal value, remaining unchanged after the aversion operation, until the generation and/or relaying and/or evaluation of the determination results is reactivated due to a build-up of information-processing orders or an increase in the continuous counting results over a comparative value lying substantially above the normal value, characterized in that, upon dropping of the periodically obtained counting results, a value existing at the time the determination result was reached or undershot is stored, and in that, after elapse of the minimum waiting time, during which the periodically obtained counting results remain below the determination result, this stored value serves as normal value, and in that until a new determination result is obtained, the periodically obtained counting results on the basis of this normal value serve to establish the continuous instantaneous values of the information traffic load.