Telephone artery with multiple access points and telephone networks with such arteries

Abstract From the Canadian patent

The artery comprises for two-way transmission of the telephone signals first and second transmission channels coupled together at one end of the artery. In each one of a plurality of geographical points, a multiplexing-demultiplexing switching device is coupled to the artery for selectively frequency translating low frequency input channels and inserting them in vacant positions of the group of multiplexed channels transmitted by the first transmission channel and selectively, extracting from the second transmission channels the corresponding return speech signals and transposing than to low frequency without complete demultiplexing of the group of multiplexed signals transmitted by the …