Nation-wide switching of intertoll trunks ¿ Transmission considerations

The successful planning, installation, and operation of a nation-wide switching plan to interconnect more than 62 million telephones in the United States requires a high degree of teamwork between various groups of people. This involves the development, design, transmission, equipment, and building engineers to provide the system and the operating and maintenance people to keep it going. This paper deals primarily with transmission phases of switching telephone trunks in the United States. Brief mention is made of the interconnection with the Canadian switching plan involving approximately 5 million additional telephones.