System for statistical supervision of trunk-dialed long-distance

Abstract

To facilitate the supervision of directly dialed long-distance telephone traffic, output signals from call monitors (G.sub.1 -G.sub.n) associated with a number of trunk lines are fed to a plurality of multisensor signal detectors (SD) of an associated exchange working into a data-input unit (ID) which includes a serializer (MS) assembling signal samples from all the sensors into a comprehensive frame. The frame serializer comprises a number of multiplexers (M1-M16) which, in the course of a scanning cycle consisting of 16 subcycles, feed respective output frames from the several detectors during each subcycle to corresponding cells of a shift register (SR). Each output frame contains bits from an associated set of sensors that are sequentially read out during the subcycle in which they are loaded into the shift register. If a given set of sensors is to be scanned at the maximum rate, i.e. 16 times per cycle in this instance, the corresponding multiplexer is not switched between subcycles; otherwise, i.e. for a scanning rate subharmonically related to the maximum rate, the multiplexer assumes two, four, eight, or sixteen different positions during a cycle under the control of an instruction memory (CC) which is addressed by a time base (BT) to read out the applicable switching cadence. The bits issuing from the shift register are fed to a processing unit (UE) including a preprocessor (IP) and a microprocessor (EL) provided with a common data memory (ME).