Developments of Communication in Switzerland

A brief review of Swiss PTT history shows that a number of switching systems have been introduced over the years. This problem of inhomogeneity shall be overcome in the future by a unique all digital PCM telephone network currently being developed which will be introduced gradually in the 1980´s. Transmission systems will use more minicoaxial cables for carrier-as well as PCM-systems. A special PCM transmission system network which will reach the major cities will provide data transmission service for channels up to 48/64 kbit/s. This early data network shall be combined later with the PCM telephone network.