Abstract

An arrangement for traffic analyzing for public telephone stations which are served from a telephone exchange. The exchange transmits charging pulses to the telephone stations through telephone subscriber's lines, when calls are requested from the telephone stations. A charging pulse counter is accessed through a charging pulse detector when a call is made. The counter counts the number of detected charging pulses during the observation period allocated to the calling telephone station. An analysis initializing circuit includes time recording data delivering means for periodically reading-out the charging pulse number in the counter and for resetting the counter after the observation period. A traffic analyzing circuit is connected selectively to charging pulse counters and compares the charging pulse number of each counter to at least two predetermined charging pulse number values specific to the telephone station at the end of each observation period allocated to the telephone station. The traffic analyzing circuit produces a coded signal which indicates the abnormal operation type of said telephone station when the charging pulse number is greater than one or less than the other of the predetermined charging pulse number values specific to the telephone station or when the charging pulse number is equal to zero in order to deduce whether the station is out of service.