COMMUNICATION SYSTEM TRAFFIC SURVEY ARRANGEMENT

摘要

In order to obtain a count of the number of ineffectual attempts which are made to seize a trunk in a direct progression communication system trunk subgroup in which all the trunks are busy, current detectors are inserted into the path between the hunting switch stepping relay of each selector level to be studied and the sleeve leads of the ninth (next to last) and tenth (last) trunks. The current detectors are arranged such that in normal operation when the associated trunk is activated the detector remains off. However, when the selector switch steps past a busy trunk the current from the stepping relay enables the detector. Circuitry is provided to insure that a count will be recorded only during the hunting interval of the selector switch and not during the release interval.