Method and apparatus for transferring the same information to a plurality of receivers

Abstract From the Canadian patent

A subscriber station functioning as a concentrator is connected to subscribers and is connected via trunk lines to a centrally placed transit exchange establishing connections by reason of a given, command, between a source sending special information and a trunk line pointed out as being idle. The subscriber station includes a trunk line economizing apparatus investigating each time a subscriber calls the source whether one of the trunk lines is already connected to the source. If no such connection is determined, the source and the calling subscriber are conventionally connected to a trunk line indicated as being idle the, number of this line being intermediately stored in a memory unit …